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Force and Motion Questions. From past papers/with mark scheme.

1. (a) Distinguish between a scalar quantity and a vector quantity.

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(2)

(b) A car travels one complete lap around a circular track at an average speed of
100 km h­1.

(i) If the lap takes 3.0…

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(b) Calculate the magnitudes of the forces

(i) at A ...................................................................................................................

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(ii) at B ...................................................................................................................

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(4)
(Total 6 marks)




3. A ball is dropped and rebounds vertically to less than the original height.

For this first bounce only, sketch graphs of

(a) the velocity of the…

Page 3

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(b) the acceleration of the ball plotted against time.




(1)




(c)

The ball is then thrown at an angle to the horizontal and follows the trajectory shown in the
diagram.

Mark on the diagram the directions of

(i) the acceleration vector at P,

(ii) the acceleration vector at Q,

(iii)…

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(d) The mass of the ball is 0.15 kg and the initial direction makes an angle of 50° to the horizontal.
Calculate the magnitude of the momentum of the ball at Q when it is projected with an initial speed
of 15 m s­1. Neglect the effects of air resistance.…

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(ii) the speed of the ball just before impact,

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(iii) the average force exerted by the ball on the wall.

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(5)
(Total 9 marks)




5. (a) What do you understand by the principle of conservation of energy?

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(2)

(b) (i) Explain…

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(c) A domestic kettle is marked 250V, 2.3 kW and the manufacturer claims that it will heat a pint of
cold water to boiling point in 94s.

specific heat capacity of water = 4.2 × 103 J kg­1 K­1
specific latent heat of vaporisation of water = 2.3 × 106…

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(b) A ball of mass 0.12 kg strikes a stationary cricket bat with a speed of 18ms­1. The ball is in
contact with the bat for 0.14 s and returns along its original path with a speed of 15 ms­1.

Calculate

(i) the momentum of the ball before the collision,…

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7. The diagram shows a gymnast of weight 720N hanging centrally from two rings, each attached to cables
which hang vertically.




(a) State the tension in each cable.

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(1)

(b) The diagram shows the gymnast after he has raised his body so that his centre of mass moves
through…

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Calculate

(i) the increase in gravitational potential energy of the gymnast,

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(ii) the tension in each cable.

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(3)

(c) The gymnast now raises his legs so that they become horizontal, without raising the rest of his body.
State and explain whether his gravitational potential energy is…

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(b) The car has an effective power output of l8kW and is travelling at a constant velocity of 10 m s .
Show that the total resistive force acting is 1800 N.

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(1)

(c) The total resistive force consists of two components. One of these is a…

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