Q2 of 26 Page 28

Choose one or more correct alternatives.

Joule is the unit of …


i. force


ii. work


iii. power


iv. energy

Option(ii) Work , (iv) Energy

Explanation:


We know work done W on a body, which moved a distance S due a force F applied on it is given as


W = FS


SI unit of work done is Joules (J) so 1 J work is said to be done when 1N force is applied on a body and moves it by 1m


i.e. 1 J = 1N × 1m


now work and energy can be interconverted and as we know work done on a body against some external force to change position of body is Potential energy , and work done to increase the speed of the body is called kinetic energy. So energy of a body is equivalent to some type of work done, i.e. work and energy have same unit Joule


Unit of force is Newton (N) and unit of power is watt (W)


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1

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Why is the work done on an object moving with uniform circular motion zero?

 2

Choose one or more correct alternatives.

For work to be performed, energy must be ….


i transferred from one place to another


ii concentrated


iii transformed from one type to another


iv destroyed

 2

Choose one or more correct alternatives.

Which of the forces involved in dragging a heavy object on a smooth, horizontal surface, have the same magnitude?


i. the horizontal applied force


ii. gravitational force


iii. reaction force in vertical direction


iv. force of friction

 2

Choose one or more correct alternatives.

Power is a measure of the ...….


i. the rapidity with which work is done


ii. amount of energy required to perform the work


iii. The slowness with which work is performed


iv. length of time