Question

1. Frictional force is ____ of area of contact..

2. The change in length of the spring is ____ to the applied force..

3. Friction is proportional to the ____ force.

4. Static friction is ____ than sliding friction.

II. Answer the following 6M

5. Does area of contact affect frictional force explain briefly?

6. Give example of practical application of static friction?

7. What happens to friction if normal force is doubled?​

Answer 1

1. Frictional force is independent of area of contact..

2. The change in length of the spring is directly proportional to the applied force..

3. Friction is proportional to the Normal force.

4. Static friction is greater than sliding friction.

5. No, area of contact does not affect frictional force. Friction depends on the contact force between the surfaces and the relative roughness of the surfaces.

6. Practical application of friction is:

a. it helps us in walking.

b. when we apply breaks in vehicles, the friction between tire and road helps it in stopping.

c. it helps object to stay on inclined surfaces.

7. if normal force is doubled?, friction will also double.

Answer 2

Answer:

1) independent

2) directly proportional

3) normal

4) greater