Question

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Answer 1

Answer:

first is when a body is in steady motion on a surface force of friction is called limiting friction vi friction can be reduced by the use of lubricants and ball bearing

Answer 2

Answer:

1. dynamic friction

2. friction is acting on the box in the opposite direction to the box's movement.

3. P

4. parallel to the contact surface

5. roller skates have rollers to reduce friction.

6.(I),(iii),(iv)

7. The buggy pulls backward on the horse just as hard as the horse pulls forward on the buggy . both of them would not move forward if surface is frictionless.