Friction Worksheet-1

Friction Worksheet-1

1. Friction is a type of:

(a) contact force                           (b) non contact force

(c) resistance force                      (d) Motion

2. A force of 5 N is required to move an object from rest. The value of static friction (f) is:

(a) 5N                 (b) f >5N            (c) f < 5N           (d) 10 N

3. The value of sliding friction for the object shown in figure is:

(a) f = 5N           (b) f > 5N           (c) f < 5N           (d) 10N

4. The surface of a table is smoother as compared to that of a road. This is due to:

(a) irregularities in the surface of road

(b) polishing of the table

(c) a road surface may have more dust as compared to a table

(d) all of these

5. Which of the following material is likely to have least friction?

(a) Wood           (b) Plastic           (c) Glass             (d) Paper

6. Which of the following is used to reduce friction in a rotating machine?

(a) Wheels                                      (b) Roolers

(c) ball bearing                              (d) Polishing

7. In which of the following cases more friction is desirable?

(a) movement of piston in a cylinder

(b) braking of a vehicle

(c) running on a track

(d) all of these

8. Powder is used in carrom board for:

(a) increasing friction                 (b) decreasing friction

(c) Decoration                              (d) Fragrance

9. Which of the following statement is CORRECT?

(a) rolling a body is easier than sliding

(b) sliding body is easier than rolling

(c) dragging body is easier than sliding

(d) dragging body is easier than rolling

10. The frictional force exerted by fluids is called:

(a) Lift                                             (b) Drag

(c) rolling friction                         (d) dynamic friction

Answer Key:

(1)-(a); (2)-(a); (3)-(c); (4)-(d); (5)-(c); (6)-(c); (7)-(b); (8)-(b); (9)-(a); (10)-(b)