Effect of roughness on frictional force. Set up an inclined plane on t

1.	Effect of roughness on frictional force. Set up an inclined plane on the horizontal floor. Use a wooden board as inclined plane. Put a mark at any point ‘A’. Now let a pencil cell or ball is move down from this point. Note down the distance travelled by the ball from the bottom of the inclined plane to point where it comes to a stop.Now, spread a cloth over the floor. Try again with ball and note down the distance.a) What are your observations from these experiments?b) In which case is the distance covered maximum?c) In which case is the distance covered minimum?d) Why is the distance covered by the pencil cell different on different surfaces?e) If the cloth is replaced with white marble surface or glass surface, what will be your prediction about the distance covered by the pencil cell?
Answer» a) The distance covered by ball in the two cases are different. b) When there is no cloth on the floor. c) When cloth is spread over the floor. d) Because, the friction offered by different surfaces are different. e) The pencil cell covers more distance.

Effect of roughness on frictional force. Set up an inclined plane on the horizontal floor. Use a wooden board as inclined plane. Put a mark at any point ‘A’. Now let a pencil cell or ball is move down from this point. Note down the distance travelled by the ball from the bottom of the inclined plane to point where it comes to a stop.Now, spread a cloth over the floor. Try again with ball and note down the distance.a) What are your observations from these experiments?b) In which case is the distance covered maximum?c) In which case is the distance covered minimum?d) Why is the distance covered by the pencil cell different on different surfaces?e) If the cloth is replaced with white marble surface or glass surface, what will be your prediction about the distance covered by the pencil cell?

Answer»

a) The distance covered by ball in the two cases are different.

b) When there is no cloth on the floor.

c) When cloth is spread over the floor.

d) Because, the friction offered by different surfaces are different.

e) The pencil cell covers more distance.