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# Feedback Comments on Friction

by Ron Kurtus

A total of 120 comments and questions have been sent in. They are listed according to date.

You can read them to further your understanding of the subject.

## List of next 10 letters

### Country

Uses of Friction Applications for friction Tanzania

Uses of Friction Factors influencing the angle of friction South Africa

Uses of Friction Reasons for the use of flat belt drives? South Africa

Resistive Force of Friction Friction on marble rolling down an incline USA

Causes of Friction What is the cause of reaction force? india

Rolling Friction Reducing roll forces Uganda

Friction Equation Calculate the resistance force on an incline Malawi

Rolling Friction and Automobile Tires Rolling friction for horse-drawn cart India

Causes of Friction What is static friction? India

Causes of Friction Why does rubber stick on an inclined plane? India

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First 10 letters

## Applications for friction

Topic: Uses of Friction

### Question

March 26, 2015

What ara the application of friction

paul - Tanzania

25865

Friction can be used to slow things down. It is also needed in moving things forward. The friction of automobile tires on the ground is used in both cases.

## Factors influencing the angle of friction

Topic: Uses of Friction

### Question

March 18, 2015

What factors influence the angle of friction ?

julie - South Africa

25840

The force of friction is in the opposite direction of the motion sliding on another object. It is a resistance to motion. The angle of the force that pushes or pulls an object can affect the resulting friction.

## Reasons for the use of flat belt drives?

Topic: Uses of Friction

### Question

March 18, 2015

What are reasons for the use of flat belt drives ?

julie - South Africa

25839

A flat belt drive uses friction to turn a wheel. Since the surface area of the belt is flat and relatively wide, it is more effective in using friction to turn or move items than a thin or shaped belt.

## Friction on marble rolling down an incline

Topic: Resistive Force of Friction

### Question

March 10, 2015

I want to know if the faster an object such as a marble rolling down an incline have a greater friction the faster it goes?
For example will a marble on a steeper slop have a greater friction then one that has a lower gradient?

Ian - USA

25822

A marble rolling down an incline will accelerate due to the force of gravity. In most case, the coefficient of friction is independent of the speed.

Rolling friction is dependent on the normal or perpendicular force of the marble on the ramp and the angle of the ramp. (See Friction on an Inclined Surface). Thus, on a steeper slope, there is less friction.

Also see Rolling Friction.

## What is the cause of reaction force?

Topic: Causes of Friction

### Question

December 19, 2014

what Is the exact cause of reaction force? I didnt get simplified and exact answe yet so I am looking forward for answer from you 'cause the previous article I read from this blog helped me alot nd thanks for that
class 10

deepsikha - india

25653

According to Newton's third law, for every action force there is an equal (in size) and opposite (in direction) reaction force. Forces always come in pairs - known as "action-reaction force pairs."

Thus, the cause of such a force is due to the law of conservation of energy and momentum.

## Reducing roll forces

Topic: Rolling Friction

### Question

November 12, 2014

1.EXPLAIN SEVERAL WAYS OF REDUCING ROLL FORCES????
2. DESCRIBE THE FEATURES OF A SCREW EXTRUDER????
3.EXPLAIN WHAT IS MEARNT BY TUBE ROLLING???

MACHO - Uganda

25526

Rolling friction is usually less when both surfaces are smooth and hard.

A screw extruder is used in high volume manufacturing process in which raw plastic material is melted and formed into a continuous profile.

Tube rolling is a similar method to roll and bend metal tubes.

## Calculate the resistance force on an incline

Topic: Friction Equation

### Question

October 22, 2014

how can you calculate the value of resistance force(maximum friction force ) on an inclined plane?

- Malawi

25472

The equation for the resistance force of friction on an inclined plane is:
F = f(r)*W*cos(a), where f(r) is the static coefficient of friction of the materials, W is the weight of the object, and cos(a) is the cosine of the angle of inclination (a).

## Rolling friction for horse-drawn cart

Topic: Rolling Friction and Automobile Tires

### Question

August 27, 2014

What will be the frictional force for rolling friction in horse and cart motion. The term for Force of friction,
F = ?R W/r, where r is the radius of 4 wheels.
Now my actual question is the total frictional force is contributed by 4 wheels / or not.
Then will it be total Frictional force= 4 ?R W/r for 4 wheels.

PANKAJ KUMAr - India

25326

With such a cart, there probably would be more friction from the axles of the wheels than the rolling friction.

To establish the rolling friction, you need to know the surface on which the wheels are rolling. The total rolling friction would be Fr = mu(R)*W/r. That would probably have to be determined experimentally, since there are so many variables.

## What is static friction?

Topic: Causes of Friction

### Question

August 15, 2014

What is static friction?

Neelkamal - India

25271

Static friction is the situation when a force pushing on an object is not strong enough to slide the object over a surface.

See Sliding Friction for an example.

## Why does rubber stick on an inclined plane?

Topic: Causes of Friction

### Question

August 13, 2014

why a rubber sticks on an inclined plain whereas a same size body of other materials slides ?

sumit - India

25260

The molecules in rubber attract other materials when sliding. Also, rubber is softer, so it deforms, causing more friction.

That is why rubber is good to increase friction where you don't want sliding.

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## Summary

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