Physics

Forces and motion, Year 8: more practice

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AQAEdexcelOCRKS3 groundwork for motion and forces — what GCSE builds on at all three boards.

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PhysicsForces and motion, Year 8: more practice
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Physics · Forces and motion, Year 8: more practiceProfessor Newton
⌨ Type the answerAnswer in your head…A 50 N force acts 0.4 m from a pivot. What is its moment in newton metres? (number only)

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Physics · Forces and motion, Year 8: more practiceProfessor Newton

20

HintMoment = force × distance from the pivot.

The why50 × 0.4 = 20 N m.

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Physics · Forces and motion, Year 8: more practiceProfessor Newton
⌨ Type the answerAnswer in your head…A boat is pushed forwards by a 20 N force while water pushes back with 12 N. What is the resultant force in newtons? (number only)

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Physics · Forces and motion, Year 8: more practiceProfessor Newton

8

HintForces in opposite directions are subtracted.

The why20 − 12 = 8 N, in the forward direction.

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Physics · Forces and motion, Year 8: more practiceProfessor Newton
Answer in your head…A sledge is pulled forward by 40 N and friction is 40 N backwards. It is moving. What happens to its speed?
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Physics · Forces and motion, Year 8: more practiceProfessor Newton

It stays the same

HintWhat is the resultant force?

The whyThe resultant force is 0 N, so there is no change in motion: the sledge keeps moving at a steady speed in a straight line.

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Physics · Forces and motion, Year 8: more practiceProfessor Newton
⌨ Type the answerAnswer in your head…A force of 600 N acts on an area of 0.03 m². What is the pressure in pascals? (number only)

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Physics · Forces and motion, Year 8: more practiceProfessor Newton

20000

HintPressure = force ÷ area.

The why600 ÷ 0.03 = 20 000 Pa (20 000 N/m²).

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Physics · Forces and motion, Year 8: more practiceProfessor Newton
Answer in your head…Is the pressure greater at the same depth in sea water or in fresh water?
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Physics · Forces and motion, Year 8: more practiceProfessor Newton

Sea water

HintThe two liquids differ in density.

The whyPressure depends on depth and on the density of the liquid. Sea water is denser, so the pressure is greater at the same depth.

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Physics · Forces and motion, Year 8: more practiceProfessor Newton
Answer in your head…Two points are at the same depth in a lake. How do the pressures there compare?
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Physics · Forces and motion, Year 8: more practiceProfessor Newton

They are equal

HintWhat does the pressure in a liquid depend on?

The whyPressure in a liquid depends on depth, not on the direction or the width of the container above the point.

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Physics · Forces and motion, Year 8: more practiceProfessor Newton
Answer in your head…What instrument measures atmospheric pressure?
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Physics · Forces and motion, Year 8: more practiceProfessor Newton

A barometer

HintIts name includes the Greek word for weight.

The whyBarometers measure the pressure of the air, which changes with the weather and altitude.

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Physics · Forces and motion, Year 8: more practiceProfessor Newton
Answer in your head…When you drink through a straw, what pushes the liquid up it?
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Physics · Forces and motion, Year 8: more practiceProfessor Newton

Atmospheric pressure on the liquid in the glass

HintSucking removes air from the straw, so what pushes from outside?

The whySucking reduces the pressure in the straw, and the greater air pressure on the surface of the drink pushes the liquid up.

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Physics · Forces and motion, Year 8: more practiceProfessor Newton
⌨ Type the answerAnswer in your head…A toy boat floats at rest and weighs 5 N. What is the upthrust on it in newtons? (number only)

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Physics · Forces and motion, Year 8: more practiceProfessor Newton

5

HintThe forces must be balanced.

The whyA floating object is in equilibrium, so upthrust equals weight: 5 N.

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Physics · Forces and motion, Year 8: more practiceProfessor Newton
Answer in your head…A steel bolt sinks but a steel ship floats. What is the key difference?
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Physics · Forces and motion, Year 8: more practiceProfessor Newton

The ship's shape means its average density is less than water's

HintThink about all the space inside the hull.

The whyA ship is hollow and encloses a large volume of air, so its overall density is less than that of water.

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Forces and motion, Year 8: more practice

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Where Forces and motion, Year 8: more practice sits on the KS3 map

6 points on the KS3 Physics map, across Y8. The faint stars are the rest of the subject — this deck is the lit part.

Pressure & moments · Y8Resultant force · Y8Pressure = force ÷ area · Y8Pressure in liquids · Y8Atmospheric pressure · Y8Floating and upthrust · Y8

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