Question

1. When do we say that work is
done?
2. Write an expressionfor the work done when a force is acting on an object in the direction of its displacement
3 define 1 j of work
4 a pair of bull clock expert a force of 140 N on a plug the field begin ploughed is 15 M long how much work is done in ploughing the length of field​

Answer 1

Answer:

1. Work is said to be done if the force applied moves it for a distance (s /h)

2. Force applied is in the direction of displacement therefore it is positive work done

W.D = F X S (displacement)

3. 1 joule of work is the work done by an object when 1 N is applied on it and gets displaced by 1 m.

4. F = 140 N

S or displacement = 15 m

W.D = F X S

= 140x 15 = 210 J