Ghs Physics Holiday Work S.4

GHS PHYSICS HOLIDAY WORK S.4

PAPER 2DEC 2014

(a) (i) State Hooke’s law. (1mark)

(ii) Describe an experiment to verify Hooke’s law using a spring. (5 marks)

(ii) A spiral spring stretches from 10cm to 12cm when a mass of 0.4kg is applied on it. Determine the force constant of the spring. (3 marks)

(b) (i) Define moment of a force about a point (1 mark)

(ii) State the conditions for equilibrium of a rigid body under action of a number of parallel forces (2 marks)

(c) A uniform metre rule freely pivoted at the 15cm mark balances horizontally when a 40g mass is suspended from its 5cm mark. Find the mass of the metre rule (2 marks)

(a) Distinguish between scalar and vector quantities, and give one example of each (3 marks)

(b) A taxi moving with a velocity of 30ms-3 accelerated uniformly at 2ms-2 for 20 seconds. The taxi then moves with uniform velocity for 10 seconds before it decelerates uniformly to rest in 15 seconds.

(i)Sketch a velocity time graph for the motion of the taxi (3marks)

(ii)Calculate the distance traveled by the taxi in the last 25 second (2 marks)

(ii) State neutron’s first law of motion (1 mark)

(iii) Briefly explain why it is necessary for a passenger in a fast speeding taxi to fasten her seat belt. (3 marks)

(d) A taxi of mass 800kg moving with a velocity of 120ms-1 collides with a stationary vehicle of mass 1200kg. After collision the two vehicles stick together and move in the direction of the taxi forsome time before coming to rest. Find their velocity immediately after collision (3 marks)

(a) (i) State the laws of reflection of light (2 marks)

(ii) With aid of ray diagrams describe how total internal reflection occurs (4 marks)

State one application of total internal reflection (1 mark)

(b) (i)

Light of the same wavelength incident at an angle i on a glass prism undergoes refraction as shown in the diagram above. If the refractive index of the material of the glass prism is 1.5, determine the size of angle i (4 marks)

(ii) State two reasons why reflecting prisms are better reflectors than plane mirrors (2 marks)

(ii) State and explain the appearance of a red tie with blue spots in red lights. (2 marks)

(a) i) Explain the phenomena of dispersion as applied to white light. (4 mks)

(ii) Draw a ray diagram to show how a pure spectrum may be obtained. (4 mks)

(iii) Distinguish between secondary and primary colour. Give one example of each.(4 mks)

(b) Name the colour that would be obtained when the following coloured lights are mixed;

i) green and red ii) cyan and red. (2 mks)

i) coloured ii) Black. (2 mks)

END