Question

Read the following passage and answer all

the four questions from 2 (i) to 2(iv)

In our daily life we consider any useful

physical and mental labour as work like

watching a movie , talking with your friends.

We define work differently in science . For a

work to be done a force should act on an

object and the object must be displaced.


(i) A person exerts 20 N of force and

displaces a trolley by 15 m in the direction of

force .Work done by him will be???

(a) 3000 J (b) 3 J (c) 300 J (d) 30 J


2 (ii) Work done by the person in the above

case is???

(a) Negative (b) positive (c) zero (d) none of

the above


2 (iii) Work done by gravity on horizontally

moving trolley is 0 because the angle

between the force of gravity and

displacement is???

(a) 0° (b) 60° (c) 90° (d) 45°


2 (iv) The formula for work done is

(i) F/s (ii) s/F (iii) 1/F (iv) F.s cosθ
replyyyyyyyy

Answer 1

Answer:

1. W=FxD

W=20×15

W=300J

2. positive

3. 90°

4. force multiply by displacement is equal to work done so as per me it must be (iv)

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