Friction Worksheet-3

Friction Worksheet-3

1. Which of the following statement is TRUE?

(a) static friction is more than dynamic friction

(b) static friction is less than dynamic friction

(c) static friction is equal to dynamic friction

(d) there is no relationship between static and dynamic friction

2. The force required to keep an object moving with the same speed is a measure of:

(a) static friction                           (b) sliding friction

(c) rolling friction                         (d) limiting friction

3. Which of the following activity would not be possible in the absence of friction?

(a) holding a glass                        (b) writing on a paper

(c) sitting on a chair                     (d) all of these

4. The force required to overcome friction at the instant when an object starts moving from rest is a measure of its:

(a) static friction                           (b) dynamic friction

(c) sliding friction                         (d) rolling friction

5. What would happen to a moving object if there would be no friction?

(a) the object will stop

(b) the object will keep moving

(c) the object will change speed

(d) the object will change direction

6. Which of the following has a stream lined body?

(a) Bird              (b) Airplane      (c) Whale           (d) all of these

7. Correct air pressure in our vehicle tyres help to reduce?

(a) static friction                           (b) sliding friction

(c) rolling friction                         (d) all of these

8. A ship moving in sea can't be stopped quickly by applying brakes due to:

(a) low friction                               (b) excessive friction

(c) high speed                                (d) none of these

9. When a coin and a feather are dropped simultaneously from the same height, the coin strikes the ground first. This is because of:

(a) gravitational force                 (b) mass of coin

(c) Friction                                    (d) none of these

10. The soles of our shoes wears out because:

(a) soles are made of poor material

(b) of poor design

(c) of friction

(d) none of these

Answer Key:

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