Work , energy and power questions | form one Physics

List down five forms of energy:

Figure 1 shows how the bob of a simple pendulum was pulled aside to position A and then realised to position C via position B. At what position will the bob attain maximum kinetic energy?

1. Position A
2. Position B
3. Position C
4. Position D
5. Position E

What physical quantity is obtained by the ratio of distance moved by effort to the distance moved by the load?

Study Figure 3 then answer the questions that follow.

(i) Calculate the work done in rising the wooden block from point A to B.
(ii) Briefly explain if it is possible for the wooden block to remain stationary when placed at the mid-point of an inclined plane?

Briefly explain how each of the following energy transformation takes place:
(i) Mechanical energy to light energy.
(ii) Chemical energy to mechanical energy.

A catapult is used to fire a stone of mass 30 g vertically to a height of 5 m. Calculate the:
(i) potential energy gained by the stone.
(ii) speed of the stone as it leaves the catapult.

A machine is able to lift 200 kg of bricks vertically up to a height of 30 m above the ground in 50 seconds. This implies that, the power of the machine in kilowatts is
A 0.12
B 1.2
C 6
D 1,200
E 3.
 

When a body of mass M, is lifted through a height h, it possesses the energy known as
A kinetic energy. B chemical energy.
C light energy. D potential energy.

Calculate the power of a pump which can lift 200 kg of water through a vertical height of 6 m in 10 seconds.

A 1000 kg car is travelling down the road at a speed of 15 m/s. How much kinetic energy does it have?