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# Characteristics of dry friction

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## What is dry friction explain the characteristics of dry friction?

Characteristics of Dry Friction Theory of Dry Friction Motion • When P is greater than F k , the frictional force is slightly smaller value than F k , called kinetic frictional force • The block will not be held in equilibrium (P > F k ) but slide with increasing speed.

## What are the characteristics of friction?

Friction is a force that opposes relative motion between systems in contact. One of the simpler characteristics of friction is that it is parallel to the contact surface between systems and always in a direction that opposes motion or attempted motion of the systems relative to each other.

## What is also called dry friction?

The dry friction is also termed as the Coulomb friction as it was given by C.A. Coulomb. Explanation: When there is no lubricating fluid present between the surfaces in contact, the dry friction occurs. Thus as the name suggests dry friction.

## What are the practical examples of dry friction?

Practical examples of dry friction. Antifriction bearings, which have to operate without a liquid lubricant will experience high wear and friction. Therefore a solid composite containing molybdenum disulfide is used within the spacing of the bearing.

## What are laws of dry friction?

Dry Friction is the force that opposes one solid surface sliding across another solid surface. Dry friction always opposes the surfaces sliding relative to one another and can have effect either opposing motion or causing motion in bodies. Static friction and Kinetic friction.

## What is angle of friction?

noun. physics the angle of a plane to the horizontal when a body placed on the plane will just start to slide. The tangent of the angle of friction is the coefficient of static friction.

## Does angle affect friction?

As the angle of the incline is increased, the normal force is decreased, which decreases the frictional force. The incline can be raised until the object just begins to slide. As the angle of the incline is increased, the force of friction will decrease due to the change in normal force.

## What is effective friction angle?

The effective sliding angle of friction is about ϕr + i at low effective normal stresses, where i = angle of asperities of a rough joint. There is a critical limit to the shear strength of the rock joint that cannot be higher than the shear strength of weaker rock material at very high confining stress.

## What is angle of friction give its formula?

Formula Used:The expression for angle of friction is given as: tanα=μ Here α is the angle of friction and μ is the coefficient of limiting friction. The expression for angle of repose is given as: tanθ=μ Here β is the angle of repose and μ is the coefficient of limiting friction.

## What is normal reaction in friction?

A force acting perpendicular to two surfaces in contact with each other. If weight is the only vertical force acting on an object lying or moving on a horizontal surface, the normal reaction force is equal in magnitude, but opposite in direction to the weight. Friction, therefore, is increased by increasing the weight.

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## How do I calculate friction?

How to find force of friction

1. Choose the normal force acting between the object and the ground. Let’s assume a normal force of 250 N .
2. Determine the friction coefficient.
3. Multiply these values by each other: (250 N) * 0.13 = 32.5 N .
4. You just found the force of friction!

## What is the use of angle of friction?

Friction angle is an important parameter in the static and dynamic stability analysis of hydraulic fill.

## What is angle of friction What are the factors that affect friction?

(2) Materials of the same shape factor and average diameter sliding down a surface of known roughness have angles of friction that decrease as the specific gravity increases, i.e. heavier particles slide easier than lighter particles of the same average diameter.

## What is laws of friction?

What are the Laws of Friction? The friction of the moving object is proportional and perpendicular to the normal force. The friction experienced by the object is dependent on the nature of the surface it is in contact with. Friction is independent of the area of contact as long as there is an area of contact.

## Which is wasteful friction?

Answer: Though friction is said to be a waste of energy in most of the times, it is really useful at many times in regular life. We need to increase the frictional force while pressing the brakes of a car or a bicycle to stop it at the right time.

## What are two laws of friction?

First law of friction: The amount of friction is proportional to the normal force exerted between the surfaces. Second law of friction: Friction does not depend on the area of contact between the object and the surface. Fifth law of friction: The speed that the object is moving does NOT change the amount of friction.

## What is friction and its types?

Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Fluid friction occurs in liquids and gases.

## What is friction in simple words?

Friction is a force between two surfaces that are sliding, or trying to slide, across each other. Friction always works in the direction opposite to the direction in which the object is moving, or trying to move. Friction always slows a moving object down.

## How do you explain friction?

Friction is a force, the resistance of motion when one object rubs against another. Whenever two objects rub against each other, they cause friction. Friction works against the motion and acts in the opposite direction. The amount of friction depends on the materials from which the two surfaces are made.

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## What is dry friction explain the characteristics of dry friction?

Characteristics of Dry Friction Theory of Dry Friction Motion • When P is greater than F k , the frictional force is slightly smaller value than F k , called kinetic frictional force • The block will not be held in equilibrium (P > F k ) but slide with increasing speed.

## What are the characteristics of friction?

Friction is a force that opposes relative motion between systems in contact. One of the simpler characteristics of friction is that it is parallel to the contact surface between systems and always in a direction that opposes motion or attempted motion of the systems relative to each other.

## What is also called dry friction?

The dry friction is also termed as the Coulomb friction as it was given by C.A. Coulomb. Explanation: When there is no lubricating fluid present between the surfaces in contact, the dry friction occurs. Thus as the name suggests dry friction.

## What are the practical examples of dry friction?

Practical examples of dry friction. Antifriction bearings, which have to operate without a liquid lubricant will experience high wear and friction. Therefore a solid composite containing molybdenum disulfide is used within the spacing of the bearing.

## What are laws of dry friction?

Dry Friction is the force that opposes one solid surface sliding across another solid surface. Dry friction always opposes the surfaces sliding relative to one another and can have effect either opposing motion or causing motion in bodies. Static friction and Kinetic friction.

## What is angle of friction?

noun. physics the angle of a plane to the horizontal when a body placed on the plane will just start to slide. The tangent of the angle of friction is the coefficient of static friction.

## Does angle affect friction?

As the angle of the incline is increased, the normal force is decreased, which decreases the frictional force. The incline can be raised until the object just begins to slide. As the angle of the incline is increased, the force of friction will decrease due to the change in normal force.

## What is effective friction angle?

The effective sliding angle of friction is about ϕr + i at low effective normal stresses, where i = angle of asperities of a rough joint. There is a critical limit to the shear strength of the rock joint that cannot be higher than the shear strength of weaker rock material at very high confining stress.

## What is angle of friction give its formula?

Formula Used:The expression for angle of friction is given as: tanα=μ Here α is the angle of friction and μ is the coefficient of limiting friction. The expression for angle of repose is given as: tanθ=μ Here β is the angle of repose and μ is the coefficient of limiting friction.

## What is normal reaction in friction?

A force acting perpendicular to two surfaces in contact with each other. If weight is the only vertical force acting on an object lying or moving on a horizontal surface, the normal reaction force is equal in magnitude, but opposite in direction to the weight. Friction, therefore, is increased by increasing the weight.

## How do I calculate friction?

How to find force of friction

1. Choose the normal force acting between the object and the ground. Let’s assume a normal force of 250 N .
2. Determine the friction coefficient.
3. Multiply these values by each other: (250 N) * 0.13 = 32.5 N .
4. You just found the force of friction!

## What is the use of angle of friction?

Friction angle is an important parameter in the static and dynamic stability analysis of hydraulic fill.

## What is angle of friction What are the factors that affect friction?

(2) Materials of the same shape factor and average diameter sliding down a surface of known roughness have angles of friction that decrease as the specific gravity increases, i.e. heavier particles slide easier than lighter particles of the same average diameter.

## What is laws of friction?

What are the Laws of Friction? The friction of the moving object is proportional and perpendicular to the normal force. The friction experienced by the object is dependent on the nature of the surface it is in contact with. Friction is independent of the area of contact as long as there is an area of contact.

## Which is wasteful friction?

Answer: Though friction is said to be a waste of energy in most of the times, it is really useful at many times in regular life. We need to increase the frictional force while pressing the brakes of a car or a bicycle to stop it at the right time.

## What are two laws of friction?

First law of friction: The amount of friction is proportional to the normal force exerted between the surfaces. Second law of friction: Friction does not depend on the area of contact between the object and the surface. Fifth law of friction: The speed that the object is moving does NOT change the amount of friction.

## What is friction and its types?

Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Fluid friction occurs in liquids and gases.

## What is friction in simple words?

Friction is a force between two surfaces that are sliding, or trying to slide, across each other. Friction always works in the direction opposite to the direction in which the object is moving, or trying to move. Friction always slows a moving object down.

## How do you explain friction?

Friction is a force, the resistance of motion when one object rubs against another. Whenever two objects rub against each other, they cause friction. Friction works against the motion and acts in the opposite direction. The amount of friction depends on the materials from which the two surfaces are made.

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# Can i use rogaine on my hairline

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## Can Rogaine be used on edges?

Rogaine®, an over-the-counter medicine containing the active ingredient minoxidil, may help you regrow your thin edges. … An over-the-counter treatment, Rogaine®, which contains the active ingredient minoxidil, can sometimes help to treat thin edges caused by traction alopecia.

## Does minoxidil work on front hairline?

A: Both Propecia and Minoxidil definitely can work in the front of the scalp as long as there is some hair in the area. Although their mechanisms of action are different, both Propecia (finasteride) and Rogaine (minoxidil) act to thicken miniaturized hair regardless of where it is on the scalp.

## Is Rogaine bad for hairline?

Is Minoxidil Effective For a Receding Hairline? Minoxidil works by improving blood flow to the area in which it’s applied. Apply it to your scalp and it can potentially improve hair density and increase the rate of growth. As such, there’s no reason minoxidil shouldn’t work for a receding hairline.

## Does Rogaine work for frontal hair loss?

Rogaine® is a tried and true formula, but it comes with many adverse side effects, is not ideal for everyday use (you don’t want to show up to work with a greasy ‘do) and does not help with frontal baldness.

## How can I regrow my frontal hairline?

There is no outright cure for a receding hairline, but there are some medications that can slow it down and help hair regrow.

1. Finasteride or Dutasteride. …
2. Minoxidil.
3. Anthralin. …
4. Corticosteroids. …
5. Hair transplants and laser therapy. …
6. Essential oils.

## How can I restore my hairline?

Rosemary oil , peppermint oil , and lavender oil have all been found to be promising treatments for a receding hairline. Essential oils should be mixed with a carrier oil, such as almond oil, coconut oil, or jojoba oil, before being applied to the scalp.

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## Can you regrow hairline?

Yes. In many cases, receding hairline is indeed reversible. The right treatment for you depends on the cause. “For androgenic alopecia, minoxidil (Rogaine) is the only FDA-approved medical treatment for both men and women,” Krejci says.

## Can I use Rogaine on my eyebrows?

While Rogaine isn’t designed for eyebrows, researchers are looking at the role of minoxidil for the treatment of eyebrow hypotrichosis (sparse or thin hair). … The researchers deemed that, based on these results, Rogaine can be a safe and effective treatment for eyebrows.

## Why is my hair thinning at the front?

Another trigger for hair loss in women is an inflammatory condition affecting the scalp. That might be eczema, psoriasis, or a condition called frontal fibrosing alopecia, which typically causes scarring and hair loss — sometimes permanent — at the front of the scalp above the forehead.

## Can a receding hairline stop?

Unfortunately, you can’t stop a receding hairline completely. For most people, a receding hairline isn’t related to a health condition that needs to be cured. But, there are treatments that could slow a receding hairline down or even encourage some hair to grow back.

# How do you get wrinkles out of silk

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## How do you get wrinkles out of silk without an iron?

If you don’t have an iron, simply hang your damp silk item outside on a sunny day. The heat from the sun will dry the item while the weight of the dampness smoothes out the wrinkles.

## How do you get wrinkles out of silk at home?

To get rid of wrinkles that are already present on silk, handwash the cloth with plain water and hang it in sunlight. Natural heat will drain out the water from the fabric and the weight of water molecules will remove undesired wrinkles.

## Can you put silk in the dryer to get wrinkles out?

Use a Low-Heat Setting on the Dryer

If your dryer has a no-heat, low-heat, cool or air-fluff setting, you can try dewrinkling silk using that setting without the risk of heat damage. Keep the drying time as short as possible, checking the item every five to 10 minutes to see if the wrinkles have lifted.

## Can you steam silk to get wrinkles out?

Steaming is the ideal way to finish delicate fabrics such as silk and silk-like synthetics, which cannot stand up to the intense, direct heat of an iron. Similarly, wool, cashmere, and wool-like synthetics should be steamed after washing to smooth any wrinkles and fluff the yarns.

## Can silk be ironed?

Most wrinkles in silk can simply be steamed out, but not everyone owns a steamer. … Flip your garments inside out and set the iron to low heat (or the silk setting). Iron silk only once it’s dry and be sure to put a cloth between the silk and the iron. Do not spray or wet silk while ironing, you may get water-stains.

## Can I put silk in the dryer?

Do not tumble dry. Silk is very delicate and the high temperatures of the tumble dryer can shrink or damage your silks. Use a detergent for delicates. Studio by Tide Delicates Liquid Laundry Detergent has been specifically designed to take care of silk.

## Can you get silk wet?

Sometimes perspiration and other conditions of wear result in permanent color change. … It will permanently change the color. And if you get a spill, don’t rub silk when it’s wet. Silk will chafe easily or develop light areas if rubble while wet.

## How do you get the wrinkles out of a flag?

How to remove wrinkles from a polyester or nylon flag? You can use a clothing steamer and you can hang the item flat and apply gentle steam to the wrinkles until they flatten and relax. Your second option is to hand or machine wash cold and then hang dry it.

## How do you soften stiff silk?

DO immerse the silk in cold water tonight (or as soon after painting as possible) and hang to dry, then iron after at least 48 hours, as shown above. After that, if you desire to soften it more, just put some liquid fabric softener and cold water in a bowl or sink, add your silk and swish a few times.

## Can I wash silk with Woolite?

Product Description. Woolite® Delicates laundry detergent is a gentle washing liquid, specially formulated to take care of your delicate garments in the wash.It can be used for machine washing in the gentle cycle, or for hand washing delicate fabrics such as silk and wool.

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## Does vinegar soften silk?

White vinegar helps to remove any residual soap in the fibres, and also restores lustre and softness to silk.

## Can you use vinegar on silk?

How to Wash Silk. Wash white and colorfast silks in tepid water—no warmer than your skin—with a mild detergent. Add 1/4 cup of white vinegar in the first rinse to remove soap residue and restore luster to the fabric.

## Can you use baking soda on silk?

We recommend using mild detergents when home laundering. If stained, start by laying the garment on a flat dry surface and gently brush any excess stain off with a dry cloth. Then, you can try covering the stain with a layer of dry absorbent powder such as talc powder, baking soda or cornstarch.

## Can you use dryel on silk?

Dryel claims it can clean “dry clean only fabric” in your home dryer. … One box of Dryel takes care of up to 16 garments. We took three articles of clothing, a rayon dress, a silk tie and some wool pants. The pants have a stain on the leg.

## Can you use softener on silk?

Avoid the fabric conditioner/softener! It is not necessary for silk. In fact, it leaves behind a coating on your laundry, that with repeated use makes it impenetrable to water and detergent (same goes for your sports gear by the way). Silk dries very quickly.

## Can I use oxiclean on silk?

Oxiclean is my favorite stain-lifter for plant-based fabrics like cotton and linen but on protein-based fabrics like silk and wool it’s a big no no. … Your silk is disintegrating.

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## How do you wash a silk kimono?

1. Consider taking the kimono to a dry cleaner. …
2. Fill the sink, or a bucket, with cold or lukewarm water, as hot water can damage silk. …
3. Add a cleansing agent. …
4. Gently agitate the kimono in the soapy water. …
5. Let the kimono air dry.

## Can you steam silk?

Silk, silk blends, silk-like, and delicate synthetics:

Steaming is also ideal for silk and delicate fabrics that cannot take high or direct heat from an iron. Hold the steamer nozzle (or head) to hover over the fabric.

## Can you put silk in the washing machine?

Only machine wash silk items if the label allows and only wash on a delicates/silk cycle. Be sure to opt for a low temperature, too. If you want to take a chance on hand-washing or using the silk/delicates programme on your washing machine, use a low temperature and wring out gently or use a slow spin cycle.

## How do you get wrinkles out of a kimono?

If yours has become severely creased, lay it shiny side down on an ironing board and place a thin, white piece of cotton on the reverse of the fabric. Dry iron at a very low temperature, turning up the heat very gradually if it fails to make a difference straight away.

## How do you clean vintage silk?

Pure silk.

Soak the garment in cool to tepid water with very mild soap or a gentle shampoo, rinse well in cold water, then add a small amount (several tablespoonsful in a 5-gallon bucket) of white vinegar to clean rinse water. The vinegar will help revive the silk’s luster and pull out any remaining soap.

# How do i identify my yamaha trumpet

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## How can I tell how old my trumpet is?

Trumpets will usually have a serial number on either side of their center valve. Depending on the brand, the serial number can tell you when or where the trumpet was made, allowing you to determine its vintage status and age.

## Where is the serial number on my trumpet?

On a trumpet, look on either side of the center valve for the serial number.

## How much is my trumpet worth?

Beginner trumpets usually range in cost from \$400 to \$1,200. Intermediate, or step-up trumpets usually range in cost \$1,200 to \$2,300 and entry level pro trumpets (still largely played by advanced students) around \$2,400 and up.

## How much does a Yamaha beginner trumpet cost?

Yamaha trumpets are generally more expensive than other brands. When buying a brand-new Yamaha trumpet, you’ll find that its price is much higher than similar brands. Their beginner model, the YTR-2330, starts at \$1,300.

## How do I know what model my Yamaha clarinet is?

If your clarinet is plastic, and the case is a small oval black, then it is a 20 or 26 model. If it is wood then it is definetly a 34 model. The model no could be located at the reverse side of the upper joint, beside c#/g# key.

## Are Yamaha trumpets good?

Yamaha is known for quality and reliability in their trumpet line of instruments, and this one is not a different kettle altogether. The YTR -8335G features a construction that appeals to players who want the best in power and sound projection. The trumpet blends well with major symphonies and jazz playing demands.

## Where are Yamaha trumpets made?

Yamaha. Yamaha trumpets are made in Japan, China, the USA, Indonesia, and Malaysia.

## What are Yamaha trumpets made of?

brass alloy

Yamaha Trumpets are available in two brass alloy options. Yellow Brass alloy has a ratio of 70% copper/30% zinc, whereas Gold Brass has 85% copper/15% zinc.

## Which is better Bach or Yamaha trumpet?

Bach trumpets have always been one of the best trumpet brands out there and the Bach Stradivarius models are still the most sold professional trumpets. That doesn’t change if we go 50 years back. Yamaha trumpets also hold their value well, and they also have a reputation for being extremely durable.

## Where is the model number on a Yamaha trumpet?

The Yamaha models are usually on the 2nd valve casing on above the 2nd valve slide.

## How much does a Yamaha trumpet cost?

Yamaha YTR-2330 Standard Bb Trumpet Bb Trumpet

## How do I know if my trumpet is good quality?

Valves, or valve pistons, are the main moving parts of a trumpet. Since the player pushes down on these to play different notes, how easy it is for the player to press these down is a good indicating factor of the trumpet’s quality.

## What is the difference between a student trumpet and a professional trumpet?

So what is the difference between a professional trumpet and a student trumpet? Professional trumpets are not guaranteed to have a better sound than student trumpets even with the same player. … Also, professional trumpets will also have more customization and features.

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## What trumpets do the pros play?

Bach: Although Yamaha has made some inroads, Bach trumpets are still the leading orchestral horns in the United States, played in most large professional orchestras and dominate high school and college ensembles. The Bach 180S-37 is the most common.

## Do old trumpets sound better?

They do play very much the same, a testament to Schilke’s quality and consistency. A blanket statement that vintage horns play better (or worse) than modern horns is just plain silly. It depends on the individual player and their perception of sound and playability.

## Does trumpet color matter?

To most working trumpet players, the color is there for effect not for any improvement in the instruments performance.

## Are silver trumpets better than brass?

Silver horns are only plated and brass isnt very much worse at heat conduction. Some people argue over the sound being different- that the lacquor deadens it. But its arguable and some blind tests have shown experts cant tell the difference by sound alone. The real difference is maitenance over time.

## Are gold or silver trumpets better?

Gold has a large bold sound with great resonance. Silver tends to deliver a bit more range and is especially strong in the top range of notes. For Brass finishes the most popular are Yellow Brass [the most common], Gold Brass and Rose Brass [Softer and More Mellow tone].

## Are trumpets made of brass?

Brass is the most commonly used material for making “brass” instruments such as the trumpet. … The timbre of an instrument depends on the ratio of copper and zinc used, and instrument makers have taken advantage of this to produce instruments with a variety of different sounds.