•Answer all questions.

1. (a) Define the following terms as used in waves,(i)Wave (ii)Frequency (iii)Period (iv)Wave length(v)Amplitude. Wave velocity.(10mrks)

(b) Give the two types of waves you know.(4mrks)

(c) A TV station produced a wave of XHz given that the distance over which the wave traveled is 10m. Find the frequency of the wave. (V=3.0×10^8).(6mrks)

2. (a) State the principal of moments. (3mrks)

(b) Define the term collision. (3mrks)

(c) Explain the two types of collision. (4mrks)

(d) A body of mass 8kg moving with a velocity of 20m/s collides with another body of mass 4kg moving with a velocity of 8m/s in the same direction. The velocity of 8kg body is reduced to 15m/s after collision. Calculate the final velocity of the 4kg body.(10mrks)

3. (a) State the Archimedes principle.(3mrks)

(b) What is meant by the following terms, (i)Bouyant force (ii) Upthrust (iii)Real weight (iv) Apparent weight (v) Weight of the fluid displaced. (10mrks)

(c) State the law of flotation. (2mrks)

(d) What name is given to a line drawn on the lower part of the ship?. (2mrks)

(e) A glass weights 7.0N in air and 3.0N in water. What is the relative density of the glass?. (3mrks)

4. (a) What is meant by the term friction?. (2mrks)

(b) Explain the two types of friction. (8mrks)

(c) Give two advantages and two disadvantages of friction. (4mrks)

(d) A box of mass 2kg rests on a horizontal surface a force of 4.4N is required to just start the box moving. What is the coefficient of static friction between the box and the surface. (6mrks) use g = 10m/s

5. (a) Define the following terms and give their SI units,(i) Work (ii) Energy (iii) Power. (9mrks)

(b) What is joule? (3mrks)

(c). What are the types of mechanical energy? (2mrks)

(d) A ball of mass 0.5kg is kicked vertically upward and raised to a height of 5m. Find the potential energy required by the ball. (6mrks)




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