11. WORK AND ENERGY

11. WORK AND ENERGY

7 Maths Exercise Solutions

A force of is acting on an object. The object is displaced through in the direction of the force. If the force acts on the object all through the displacement, Then work done is or .
11.1 Work, Question No.1
A force of is acting on an object. The object is displaced through in the direction of the force. If the force acts on the object all through the displacement, Then work done is or .
A force of 7N acts on an object. The displacement is, say 8m, in the direction of the force (Figure 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?

11.1 Work, Question No.2
A force of 7N acts on an object. The displacement is, say 8m, in the direction of the force (Figure 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?

A porter lifts luggage of from the ground and puts it on his head above the ground. Calculate the work done by him on the luggage.
11.1 Work, Question No.3
A porter lifts luggage of from the ground and puts it on his head above the ground. Calculate the work done by him on the luggage.
When do we say that work is done?
11.1 Work, Question No.4
When do we say that work is done?
Write an expression for the work done when a force is acting on an object in the direction of its displacement?
11.1 Work, Question No.5
Write an expression for the work done when a force is acting on an object in the direction of its displacement?
Define of work?
11.1 Work, Question No.6
Define of work?
A pair of bullocks exerts a force of  on a plough. The field being ploughed is long. How much work is done in ploughing the length of the field?
11.1 Work, Question No.7
A pair of bullocks exerts a force of  on a plough. The field being ploughed is long. How much work is done in ploughing the length of the field?