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Edexcel | Physics WPH0 | S 15 4 1 | 1 hour 30 minutes

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Hammer Throwing is an Olympic sport. The sport uses a metal sphere attached to a

chain. The athlete holds the chain and spins around to give the sphere a large angular

velocity.

When the sphere is released it travels in a parabolic path through the air and lands on the

ground.

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(a)

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2 Mark s

Explain why, at the instant of release, the sphere stops travelling in a circular path.

(when released) there is no (horizontal) force acting

Force is needed to change direction

Or sphere travels in a straight/tangential line

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(b)

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The sphere has a mass of 7.3 kg. The athlete moves the sphere through a circle of

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(b) (I)

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2 Mark s

Calculate the angular velocity of the sphere.

Angular velocity =

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(b) (II)

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2 Mark s

Assuming that both the circle and chain are horizontal, calculate the force that the

athlete exerts on the chain just before its release.

Force =.

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(c)

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The diagram below shows the sphere moving in a vertical circle.

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(c) (I)

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1 Mark

Draw arrows on the diagram to show the direction of the centripetal force on the

sphere at each of the positions X, Y and Z.

Three arrows all pointing to the centre of the circle

(accept free hand and lines of varying length but they must touch the

spheres)

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(c) (II)

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4 Mark s

The tension in the chain varies as the sphere moves in the vertical circle.

State the position, X, Y or Z, at which the tension will be a maximum and the

position, X, Y or Z, where it will be a minimum. Explain your answers.

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