How do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?

One Line Answer

The nail becomes hot due to friction. Friction changes kinetic energy to heat.

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Force of Friction

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Chapter 2: Force and Pressure - Exercises [Page 20]

Chapter 2 Force and Pressure
Exercises | Q VIII. 3. | Page 20

Friction opposes the ______ between the surfaces in contact with each other.

Explain why sportsmen use shoes with spikes.

Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.

Fill in the blank.

We use ball bearings to .................. the friction.

Name the two kinds of forces in nature.

Name the three kinds of friction.

Answer the following.

What do you understand by a force?

Answer the following in a word or two or in a sentence.

Why does a rolling ball stop after moving some distance?

Fill in the blank.

Bicycles use ...................... to reduce friction between the pedals and the crank

Answer the following in short.

When you push something heavy, the resistance you feel decreases as soon as the object starts moving. Explain the reason.