1)A force 168 newton\'s causes a displacement 2.4 metres which is at an angle of

Question

1)A force 168 newton's causes a displacement 2.4 metres which is at an angle of 62° to the direction of the force vector. Calculate the work done by the force.

2)A car mass 1600kg is moving at 23m/s. The brakes applied, and do 7.6J of work on the car. What is the new speed? Answer in 2s.f

3)A sheet rubber, initially 2.2cm thick, is compressed by 0.16mm when a mass of 10.2kg is placed upon the sheet. Calculate the change in elastic potential energy 2s.f

4) A spring with a spring constant of 612N/m is stretched from an initial displacement of 0.2 m to a final position of 0.36m. Calculate the work that must be done by the external force. Give your answer to 2 s.f

5) A driver of mass 0f 52.0kg is diving at 20.6 m/s and is forced to brake to a complete halt (v=0). Calculate the change in momentum of the diver. Answers in Kg.m/s to 2s.f

Explanation / Answer

1) W = F.d = Fdcos@ = 168 x 2.4 x cos62 = 189.29 J

2) work done by all force = change KE

- 7.6 = 1600v^2/2 - 1600x23^2 /2

v = 22.9999 m/s

3) change in PE = mgh = 10.2 x 9.81 x (0.16 x 10^-3) = 0.016 J

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