Question

Give reasons for the following statements.

1. Force does not change the mass of the body.

2. Squeezing a tube is an example of applying force.

3. The force required to start a motion is maximum as compared to the force required to keep a body in motion.

4. The sole of our shoes wears out after using them for a long time.

5. Heavy objects are moved using rollers or wheels.

6. When we rub our palms, they get warm.

7. We put talcum powder on a carrom board.

8. Friction is a necessary evil.

9. We slip on the floor, if there is water, oil or soap solution on the floor.​

Answer 1

I thought that the answer is

5. Heavy objects are moved using rollers or wheels.

Answer 2

Answer:

1. F = M(mass) X A( Accerlaration)

4. because after long run a we apply a continues friction and force to it that's why

7. when we rub over hand friction is created that simply produces Enegery in the form of heat

8. yes friction is a necessary evil because if friction is not available you will not be able to move for example running a car on road vs running a car on sand... it's difficult for us to run a vehicle on sand because friction is not available there