Friction Worksheet-2

Friction Worksheet-2

1. A streamlined body:

(a) increases friction                   (b) reduces friction

(c) decreases weight                    (d) increases weight

2. In decreasing order of magnitude which of the following is CORRECT?

(a) rolling, static, sliding friction

(b) static, sliding, rolling

(c) static, rolling, sliding

(d) sliding, static, rolling

3. In which of the following cases, the speed of the ball will be more?

(a) A > B

(b) B > A

(c) In both cases speed will be same

(d) None of these

4. Which of the following activities is easier to perform?

(a) dragging a box

(b) lifting a box

(c) rolling a drum of same weight

(d) all of these need same effort

5. A meteor burns up on entering earth's atmosphere due to:

(a) atmospheric pressure           (b) heat of the earth

(c) solar radiation                        (d) excessive friction

6. The surface of the head of a match stick and sides of a match box are deliberately made rough to:

(a) increase friction                     (b) decrease friction

(c) increase amount                     (d) decrease amount of heat

7. Spikes are provided in the shoes of athlete:

(a) for decoration                         (b) to increase friction

(c) to decrease friction                (d) none of these

8. Which of the following statements is NOT true?

(a) Friction can be reduced by converting sliding friction into ruling friction.

(b) Friction in air and water can be reduced by streamlining the shape of the object.

(c) A polished surface will have less friction.

(d) Friction can be reduced to zero

9. Friction reduces efficiency of machines due to:

(a) Production of heat

(b) Wearing out of moving parts

(c) Increase in energy consumption

(d) all of these

10. The force which prevents us from slipping while walking on the road is:

(a) muscular force of our body

(b) gravitational pull by earth

(c) friction force

(d) balanced forces of nature

Answer Key:

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