Work , energy and power questions | form one Physics

A stone of mass 500 g is lifted through a height of 2 m. The energy possessed by the stone is known as:
A. chemical energy
B. kinetic energy
C. mechanical energy
D. potential energy.

Work and energy have the same SI unit called:
A. calorie
B. joule
C. pascal
D. watt.

1. What is energy?
2. State the principle of conservation of energy.
3. A motor exerts a horizontal force of 200 N in pulling a box 10 m across a level floor. How much work did the motor do?

An object of 100 kg is lifted to a height of 5 m above the ground in 3 seconds. Calculate its:
(i) Work done
(ii) Power

A boy weighing 45kg climbs up a stair case to height of 7 m in 5 seconds. The amount of work done by the boy:
A. 70J
B. 105J
C. 450J
D. 315J

a) Define the term “power”.

b) A man whose mass is 75 kg walked up 12 steps of 20 cm each in 5 seconds. Find the power that was developed.

1. Mention types of mechanical energy
2. A body of mass 10kg is raised to a height of 4 metres above the ground in 2 seconds.
   (i) Find the energy possessed by the body after raising it.
   (ii) What type of energy is possessed by the body?

When work output is equal to work input, it is called
A. principle of momentum.
B. principle of work.
C. principle of energy conservation.
D. principle of moments.

Potential energy and Kinetic energy are similar because:
A. Both produce heat.
B. Both are measured in Watts.
C. One is a substitute for the other.
D. Both are forms of Mechanical energy.

What do you understand by the following terms:
(i) Work
(ii) Power
(iii) Energy