The rate of change of momentum is __________.

1. Define the following terms Elasticity (5 mk)
2. Define the following terms Osmosis (5 mk)
3. Why are dams constructed thicker at the bottom than at the top? (10 mk)

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a) Explain briefly the relationship between i) Physics and chemistry ii) Physics and biology iii) Physics and mathematics b i) Give two (2) examples of items in chemistry that use the application of physics ii) Give two (2) concepts in Mathematics that is relevant to the study of physics

1. Explain briefly the relationship between Physics and chemistry (0 mk)
2. Define the term power and state its S. I. Units. (3 mk)
3. Mention three (3) areas where power is applied. (2 mk)
4. Explain briefly the relationship between Physics and mathematics (0 mk)
5. Give two (2) examples of items in chemistry that use the application of physics (0 mk)
6. Give two (2) examples of items in chemistry that use the application of physics (0 mk)
7. Give two (2) concepts in Mathematics that is relevant to the study of physics (0 mk)
8. Give two (2) concepts in Mathematics that is relevant to the study of physics (0 mk)

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(c) Mention two (2) areas where geothermal energy can be harnessed.

1. What is meant by sustainable energy sources. (0 mk)
2. List three (3) sources of sustainable energy. (3 mk)
3. State Two (2) disadvantages of wind energy. (2 mk)
4. Mention two (2) areas where geothermal energy can be harnessed. (2 mk)
5. List three (3) sources of sustainable energy. (0 mk)
6. State two (2) advantages of wind energy. (0 mk)
7. State two (2) disadvantages of wind energy. (0 mk)
8. Mention two (2) areas where geothermal energy can be harnessed. (0 mk)

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Briefly explain the following situations

1. Mangoes fall down when the mango tree is shaken. (2 mk)
2. Inertia of motion (1 mk)
3. Inertia of direction (1 mk)
4. Dust particles are removed from a carpet by beating with a stick. (2 mk)
5. When passenger jumps into a moving train, he falls backwards. (2 mk)

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a) Define the following terms i) Thermometer ii) Constriction b) Name three (3) types of thermometer c) State three (3) reasons why mercury is preferred for use as a thermometric liquid.

1. Define Elasticity (2 mk)
2. Thermometer (2 mk)
3. Name three (3) types of thermometer (3 mk)
4. State three (3) reasons why mercury is preferred for use as a thermometric liquid. (3 mk)
5. Define Thermometer (0 mk)
6. Define Osmosis (2 mk)
7. Constriction (2 mk)
8. Define Constriction (0 mk)
9. Name three (3) types of thermometer (0 mk)
10. State three (3) reasons why mercury is preferred for use as a thermometric liquid. (0 mk)

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a) Define the following terms i) Efficiency. ii) Fulcrum b) List down three (3) most common types of simple machine. c) A handle of the screw – jark is 40cm long and the pitch of the screw is 0.5cm. what force must be applied to the end of the handle when lifting a load of 2400N if the efficiency of the jark is 40%.

1. Efficiency. (4 mk)
2. Define Efficiency. (0 mk)
3. Define Fulcrum (0 mk)
4. List down three (3) most common types of simple machine. (0 mk)
5. A handle of the screw – jark is 40cm long and the pitch of the screw is 0.5cm. what force must be applied to the end of the handle when lifting a load of 2400N if the efficiency of the jark is 40%. (0 mk)

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A truck for transporting sand is filled to its capacity. If the digger had to move through a height of 2 metres and the total load was 5000kg. Calculate: i) The work done in loading the sand. ii) The power developed in 5 seconds,

1. The work done in loading the sand. (0 mk)
2. The power developed in 5 seconds, (0 mk)

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