5) Are the statements below correct? a) 1. Considering two different ways in the

Question

5) Are the statements below correct? a) 1. Considering two different ways in the figure to push two identical heavy boxes to move, case b) is less strenuous than case a) because it has smaller kinetic friction. b) 2. When a car is speeding up, the friction force on the tire from the road has the same direction as that when the car is slowing down. 3. With the presence of kinetic friction, an object pulled by gravity can no longer slide down an inclined plane at ajconstant acceleration 4. When a rotating wheel is suddenly placed on the road, the kinetic friction will deaccelerate the rotational motion but accelerate the translational motion of the wheel. 6) Consider a pure-rolling race where two objects I and II are simultaneously released from the top of an inclined plane and roll down to a finish line. For each group below, answer which object will win the race or it will be a tie (I or ll or Tie). 1. I: 100g solid cylinder with R 10cm vs ll: 200g solid cylinder with R 10cm. 2. 1: 100g solid cylinder with R 10cm vs Il: 100g solid cylinder with R 20cm. 3. I: 100g solid cylinder with R-# 10cm vs 11:100g hollow cylinder with R 10cm. 4. I: 100g solid cylinder with R 10cm vs ll: 100g solid sphere with R-10cm.

Explanation / Answer

5.1 Statement is wrong.

In both case a and b effort will be same.

5.2 statement is wrong.

when car is speeding up friction is in direction of motion and when slowing friction is opposite to motion.

5.3 Statement is wrong.

5.4 statement is true.

friction give torque which decrease angular velocity where as same friction speed it up.

6)

1 Tie.

2 Tie.

3 I wins. solid cylinder has more tengential acceleration compared to hollow cylinder.

4 II wins. solid sphere has less moment of inertia compared to solid cylinder and hence more acceleration.

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