WPH0 QR Dynamic Papers Physics al Edexcel

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

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17

(a)

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2 Mark s

State the principle of conservation of momentum.

Sum of momenta before (collision) = sum of momenta after (collision)

Or the total momentum before (a collision) = the total momentum after (a

collision)

Or total momentum remains constant

Or the momentum of a system remains constant

Provided no external/unbalanced/resultant force acts

Or in a closed/isolated system

17

(b)

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1 Mark

State the relationship between the resultant force acting on an object and the

momentum of the object.

Force equals rate of change of momentum

Or force is proportional to rate of change of momentum

Or F = Δ(mv)/ Δt with terms defined

Or F = Δp/ Δt with terms defined

17

(c)

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17

(c) (I)

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2 Mark s

The initial velocity is shown in the diagram.

Complete the vector diagram to represent the change in velocity. You do not need

to draw it exactly to scale.

Line at right angles to drawn vector, arrow upwards and labelled.

Resultant vector joined and arrow in correct direction.

Correct diagram

Wrong direction (vector addition rather than subtraction: can score 1 mark

here but allow full ecf in (c)(ii)

17

(c) (II)

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3 Mark s

Determine the change in velocity of the car.

Magnitude of change of velocity =

Direction of change of velocity =

17

(c) (III)

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2 Mark s

The mass of the car is 1500 kg and the change in velocity took 4.0 s.

Calculate the average force that was needed.

Force =

Use of p=mv and F = Δp/t

F = 7100 N or 7200 N ecf their value from (c)(ii)

Example of calculation

F = Δp/t

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