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Edexcel | Physics 4PH0 | W 17 1 | Q10

W 17 1

10

(a)

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The diagram shows the construction of a bicycle pump.

When the piston handle is pulled, air moves past the flexible rubber disc into space S.

When the piston handle is pushed, the flexible rubber disc presses against the

sides of the cylinder so no air can pass the disc in either direction.

W 17 1

10

(a) (I)

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3 Mark s

When the volume of space S is 80

, the air in space S has a pressure of 1.01×

The valve is sealed so no air can escape from the pump.

Calculate the pressure inside space S when the piston handle is pushed in and

the volume decreases to 10

pressure = ............................................. Pa

substitution;

rearrangement;

evaluation;

e.g.

equation is given

W 17 1

10

(a) (II)

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1 Mark

State an assumption you have made about the air in space S.

the temperature is constant;

W 17 1

10

(a) (III)

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2 Mark s

When the bicycle pump is used to inflate a tyre, the pump becomes hot.

Suggest why the pump becomes hot.

any two from:

MP1. friction /rubbing;

MP2. between rubber disc and walls OR

air molecules and valve;

MP3. work is done on the gas;

allow for 1 mark

unqualified

statement that

temperature

increases pressure

as increases

W 17 1

10

(b)

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The photograph shows a woman using a pump to lift water from a well.

W 17 1

10

(b) (I)

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1 Mark

State the relationship between work done, force and distance moved.

work done = force X distance moved;

W 17 1

10

(b) (II)

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3 Mark s

Calculate the work done in lifting 1.25 kg of water a distance of 8.70 m.

work done = ............................................. J

conversion of mass to N;

substitution;

evaluation;

e.g.

1.25 kg is 12.5N

F= 12.5 8.70

=109 (J)

allow GPE

calculation

accept

108.75 (J)

110 (J)

10.875 or 11 J

gets 1 mark

maximum

other POT error

only loses

conversion mark

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