Check what I know: Energy and Fields · H2 Physics 9478

Check what you know about H2 Physics Energy and Fields, practise what needs work, then check your progress and return for a later review.

GCE A-Level H2 Physics 2027

Learning goals

Work through the questions and use the feedback to plan revision.

This check is a formative starting point for the topic. Complete the questions, then use the feedback to choose the practice and repair work that follows.

Selected responses on this page do not establish H2 Physics mastery. Use your written problem solving and practical work as the stronger evidence of what you can do independently.

Check what I know

Check what I know: Energy and Fields · H2 Physics 9478

A text-complete selected-response activity with quantities, units, directions, conditions, choices and feedback stated explicitly.

About 8 minutes

Check what I know

Answer 7 short questions. This starting check helps choose what to work on; it does not prove mastery.

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This check needs JavaScript to record answers. The reviewed questions are listed below for study.

A battery transfers 240 J electrically to a motor. The motor raises a load by 150 J and warms itself and the surroundings by 90 J. Which account is correct?

Only the useful 150 J is conserved; the 90 J is destroyed.
The motor creates 150 J of gravitational energy in addition to the 240 J supplied.
The load gains 240 J and the motor separately releases 90 J, so output exceeds input.
Energy is conserved: 240 J enters, 150 J reaches the gravitational store and 90 J reaches thermal stores.

A constant resultant force of 12 N moves a 3.0 kg trolley 5.0 m from rest along the force direction. What speed does the work–energy theorem predict?

6.32 m s⁻¹
4.47 m s⁻¹
20.0 m s⁻¹
40.0 m s⁻¹

A positive test charge is removed from a region that still contains a fixed source charge. Does the electric field at that point disappear? Define electric field strength.

Yes; E is force multiplied by test charge.
No; E is force per unit positive test charge.
Yes; removing the test charge removes the field.
No; E is potential energy per unit mass.

A spring's force rises linearly from 0 to 50 N as it is extended by 0.20 m. How much elastic potential energy is stored?

10 J
250 J
5.0 J
2.5 J

A lift raises a 600 kg load vertically at a steady 0.80 m s⁻¹. Take g = 9.81 m s⁻². What useful mechanical power is delivered?

0.471 kW
5.89 kW
7.36 kW
4.71 kW

A student derives the kinetic energy of a body of mass m accelerated from rest by a constant resultant force F through a distance s to a speed v. They write: (1) W = Fs; (2) F = ma, so W = mas; (3) from rest, v² = 2as, so as = v²; (4) so the kinetic energy gained is mv². Which step is the first to be wrong, and why?

Step 1, because work done is force divided by distance, not force multiplied by distance.
Step 2, because Newton's second law relates force to momentum, so it cannot give F = ma here.
Step 3, because v² = 2as gives as = ½v², so the factor of one half is lost here.
Step 4, because the work done by the resultant force is not the kinetic energy gained.

A student draws the gravitational field lines outside an isolated spherical planet. Which drawing is correct?

Straight radial lines ending on the planet's surface, evenly spread all round, with arrows pointing towards the planet.
Straight radial lines evenly spread all round the planet, with arrows pointing away from it.
Parallel vertical lines above the planet only, with arrows pointing down.
Closed loops going round the planet at different distances.

Practise

Practise: Energy and Fields · H2 Physics 9478

A text-complete selected-response activity with quantities, units, directions, conditions, choices and feedback stated explicitly.

About 10 minutes

Practise

Questions are selected when you start. Use the feedback to decide what to practise next; this does not prove mastery.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

This check needs JavaScript to record answers. The reviewed questions are listed below for study.

A ball loses 18 J from its gravitational store while falling and gains 14 J of kinetic energy. What happened to the remaining energy?

4 J ceased to exist because air resistance is non-conservative.
The ball must have gained 32 J of kinetic energy because both figures are added.
The gravitational store still contains the missing 4 J at the lower position.
4 J was transferred to other stores, chiefly thermal energy of the ball and air.

A 0.80 kg object speeds up from 3.0 m s⁻¹ to 7.0 m s⁻¹. What is the net work done on it?

16 J
3.2 J
20 J
39 J

Which option correctly describes a uniform field, defines gravitational and electric field strength, and relates field work to potential-energy change?

A field exists only at a test body and always raises potential energy.
Uniform lines are parallel/equally spaced; g=F/m, E=F/q; Wfield=−ΔU.
Uniform lines are radial; g=Fm, E=Fq; Wfield=ΔU.
Radial lines are parallel; equipotentials follow field lines.

A pump takes 2.0 kW and transfers 1.5 MJ usefully in 15 min. What is its efficiency?

50%
75%
125%
83%

Which comparison of potential-energy stores is correct?

Elastic potential energy is always Fx, even when force rises from zero.
Electric potential energy exists only when a test charge is moving.
Gravitational and electric stores depend on relative position in a field; an elastic store depends on deformation.
All potential energy is energy stored only in the moving object itself.

In deriving Eₖ = ½mv², a constant resultant force F accelerates a body of mass m from rest through a distance s. Which expression for the work done by that force uses only the mass, the acceleration and the distance?

mas
½mas
ms/a
ma/s

When drawing the field lines of any gravitational or electric field, the lines must never cross. Why?

The field at a point has only one direction, and a crossing would give that point two.
Where two lines cross their fields cancel, so a crossing would show a point of zero field.
Field lines carry charge or mass along them, which cannot pass through the same point twice.
It is only a drawing convention to keep diagrams tidy; crossing lines would be equally correct.

Practise

Practise after feedback: Energy and Fields · H2 Physics 9478

A text-complete selected-response activity with quantities, units, directions, conditions, choices and feedback stated explicitly.

About 10 minutes

Practise

Questions are selected when you start. Use the feedback to decide what to practise next; this does not prove mastery.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

This check needs JavaScript to record answers. The reviewed questions are listed below for study.

A heater takes 500 J electrically; the water gains 410 J of internal energy. Which energy statement is complete?

The remaining 90 J transfers to other stores, including the heater, container and surroundings; total energy is conserved.
The heater destroys 90 J because its useful output is below its input.
The water gains 910 J because electrical and thermal energies are added.
The 90 J remains electrical energy inside the disconnected supply.

The force component along an object’s displacement rises linearly from 0 to 30 N over the first 2.0 m, then remains 30 N for another 1.0 m. What work does this force do?

30 J
75 J
90 J
60 J

A +4.0 μC bead is in a uniform field of 2.5 × 10³ N C⁻¹. Find its force. If the field does 8.0 × 10⁻⁴ J of work, find ΔU and orient an equipotential.

6.25 × 10⁸ N; ΔU=0; no equipotential
1.0 × 10⁻⁶ N along E; ΔU=+8.0 × 10⁻⁴ J
1.0 × 10⁻² N along E; ΔU=−8.0 × 10⁻⁴ J; equipotential perpendicular to E
1.0 × 10⁻² N opposite E; ΔU=+8.0 × 10⁻⁴ J; equipotential parallel to E

A motor with 72% efficiency provides a steady 900 W mechanical output. What electrical input power is required?

1.25 kW
0.648 kW
0.972 kW
1.62 kW

A Hooke-law spring stores 2.4 J at extension x. It is then extended to 1.5x without exceeding its limit of proportionality. What is the new stored energy?

8.1 J
5.4 J
3.6 J
4.8 J

mas
½mas
ms/a
ma/s

When drawing the field lines of any gravitational or electric field, the lines must never cross. Why?

The field at a point has only one direction, and a crossing would give that point two.
Where two lines cross their fields cancel, so a crossing would show a point of zero field.
Field lines carry charge or mass along them, which cannot pass through the same point twice.
It is only a drawing convention to keep diagrams tidy; crossing lines would be equally correct.

Check my progress

Check my progress: Energy and Fields · H2 Physics 9478

A text-complete selected-response activity with quantities, units, directions, conditions, choices and feedback stated explicitly.

About 10 minutes

Check my progress

Answer 8 questions. If accepted, this result can contribute to your course progress.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

Check again

Check again: Energy and Fields · H2 Physics 9478

A text-complete selected-response activity with quantities, units, directions, conditions, choices and feedback stated explicitly.

About 10 minutes

Check again

Answer 8 questions. If accepted, this result can contribute to your course progress.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

Review

Review: Energy and Fields · H2 Physics 9478

A text-complete selected-response activity with quantities, units, directions, conditions, choices and feedback stated explicitly.

About 10 minutes

Review

Answer 8 questions. A scheduled review can contribute to your course progress only when it is due and the result is accepted.

Recent attempts

History is stored only in this browser.

No completed attempts are saved yet.

Course and syllabus information

Course: GCE A-Level H2 Physics
Edition: GCE A-Level H2 Physics 2027

Check what I know: Energy and Fields · H2 Physics 9478

Check what I know: Energy and Fields · H2 Physics 9478

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Practise: Energy and Fields · H2 Physics 9478

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Practise after feedback: Energy and Fields · H2 Physics 9478

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Check again: Energy and Fields · H2 Physics 9478

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