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Answers to Readers' Questions on Physics:

Friction

The following 15 comments and questions have been sent in. They are listed according to date.

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I want know more about friction

Question

February 23, 2011

I want know more about friction. Please send friction documents.

Aswani - India

21249

Answer

Feel free to go through all our lessons on friction. Also look at the Reader Feedback in the Friction lessons.

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What will happen if friction is not there?

Question

August 13, 2010

What will happen if friction is not there? Explain briefly.

Aninda - India

20236

Answer

Others have asked this question and are seen in Answers to Readers Questions.

You could not walk or pick up a pencil without friction, because everything would slip. You could not even turn over in bed, because friction is needed to do that.

Friction is needed to keep things from sliding or slipping.

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Why take small steps on ice?

Question

November 16, 2005

While walking on ice, one should take small steps to avoid slipping. why is it so?

bns - India

8970

Answer

When you take a large step, you are putting more force on the rear foot, increasing the slipping. Also, the angle that the shoe is on the ice is larger, which will reduce the normal force and thus reduce the friction.

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What happens to friction energy?

Question

November 15, 2005

What happens to the energy that is used to overcome friction, where does it go?

GT - USA

8965

Answer

The energy turns from mechanical energy to heat energy. Just rub something vigorously and you will feel it get warmer.

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Sport where friction is important

Question

October 26, 2005

select a sporting activity where the case that starting friction is greater than sliding friction can be advantageous to this case.

henry - Ghana

8705

Answer

If you try to run, you want the friction to be great enough to move you forward without sliding. Any sport where there is running requires the static friction (starting) to be greater than the kinetic friction (sliding).

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Coefficient of friction of mild steel on rubber

Question

August 30, 2005

Hi there!

I'm desperately looking for the kinetic coefficient of friction value of mild steel on rubber (sponge rubber as used in automotive door seals)

Pls assist me or give me some broad guidelines.

Best regards

Desai - South Africa

7940

Answer

I'm sorry, but we haven't been able to find that information. You might try to determine the value experimentally.

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How can friction be helpful?

Question

February 27, 2005

how can friction be helpful and how can it make things difficult? Please give me two reasons. I need it as soon as possible for my science test on tuesday. Thanks. And also, can you tell me how friction was involved. Because on my experiment, I used a block of wood and rubber band and let the spring scale move on the sandpaper. I don't know why it takes more force on the sandpaper than the other surfaces like waxpaper. Thanks.

Queenie - Canada

6149

Answer

You couldn't walk without friction, because you'd slip like on ice. But friction make it hard to slide things.

Rough surfaces have a higher coefficient of friction and smooth surfaces.

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Wants to increase friction in Sitar

Question

January 16, 2005

I have a musical instrument (Sitar) whose wooden pegs become smooth due to constant use and do not stay when turned but slide back. What subtance can I use to increase friction?

Thank you

Regards

Dr Mony

Subramony - Malaysia

5638

Answer

If you sanded the pegs, they would have more friction again. But unfortunately, they might also be slightly too small to stay in place.

Wrapping each with a piece of masking tape might work. But, you may end up having to replace the pegs. I would think this is a common problem with the Sitar, so I wonder if local music stores would have a better solution?

Best wishes on getting it to work properly.

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Coefficient of static and dynamic friction

Question

November 22, 2004

.what is the diffrence between the coefficient of static and dynamic friction.

describe the term, limiting coefficient of static or dynamic friction.

hassan - UK

5128

Answer

The coefficient of friction is the number that affects the resistive force of friction. Dynamic friction is the same as kinetic friction. It is the resistive force on a moving, sliding object.

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How do we overcome friction?

Question

May 17, 2004

By what methods do we overcome friction?

Thanks for your kindest help.

Regards,

sibel - Canada

3332

Answer

Friction is a resistance to a force pushing an object. The force overcomes that resistance. You can reduce the friction by means of a lubrication, like grease or oil.

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