Q13 of 21 Page 16

Karthik is observing the live telecast of a one day cricket match. He noticed motion of a roller on the pitch during lunch break. He thought about various forces acting on the roller and the net force when it is in motion. Many questions arose in his mind regarding the direction of the net force. Can you guess what would be those questions?


i. What are the forces acting on roller when the roller is at rest and when it is moving?


ii. Does the forces acting on the roller depend upon the direction of motion of the roller?


iii. Can we get the direction of net force when force is applied on the roller by the people driving it?


iv. Are there more than two net forces ?!


More from this chapter

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11

How do you increase the pressure by keeping (a) area unchanged and (b) force unchanged?

 12

Imagine that friction has disappeared from the earth. What will happen? Explain.

 14

Design and conduct experiments to test few ways how friction may be reduced.

 15

a) Take two identical straws and suspend one of them freely. Rub the other straw with a piece of paper. Bring the rubbed end of the straw near the suspended one.

What do you observe from this activity? Can you tell which type of force is it?


b) Comb your dry hair. Bring the comb near small pieces of paper. What do you observe? Explain.