1. How far does it move before coming to rest? 2. How far does it move this time before coming to rest?

Question

Take a glass marble. Create an apparatus as shown is figure. Roll it down the apparatus on a smooth surface. How far does it move before coming to rest? Now roll down the glass marble on the same apparatus but on a rough surface. How far does it move this time before coming to rest? You will find that the glass marble comes to rest earlier on the rough surface.

It is clear that friction depends on the surface in contact. If the surface is smooth, then the force of friction will be less whereas if the surface is rough, then the force of friction will be more.

To walk easily force of friction is important. The surface of banana peel and ice is smooth. That's why we can't walk on it easly and fall down.

1. How far does it move before coming to rest?

2. How far does it move this time before coming to rest?

Answer 1

1. Glass marble rolls a long distance. Now roll down the glass marble on the same apparatus but on a rough surface.

2. Glass marble comes to rest earlier on the rough surface.

Conclusion : It is clear that friction depends on the surface in contact, if the surface is smooth, then the force of friction will be less where as if the surface is rough, then the force of friction will be more.