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Course: AS Physics 9702
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AS Physics 9702

1. Physical quantities and kinematics

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2. Dynamics, forces and pressure

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3. Work, energy, power and deformation

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4. Waves and superposition

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5. Electricity and D.C. circuits

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7. Circular motion and gravitational fields (A Level)

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8. Thermal physics (A Level)

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10. Electric fields and capacitance (A Level)

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11. Magnetic fields and alternating currents (A Level)

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12. Quantum and nuclear physics (A Level)

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13. Medical physics and astronomy (A Level)

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Quiz

AS & A Level Physics 9702 – 3.1 Work, energy and power – Quiz

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Work, energy and power AS Physics quiz: free practice for AS Physics 9702. Work through this Work, energy and power AS Physics quiz and get instant feedback on every answer. If you get stuck, review the 3.1 WORK, ENERGY AND POWER — Notes lesson. More practice: AS Physics 9702 — all units. Syllabus: Cambridge AS & A Level Physics 9702 syllabus.

1.

A force of 50 N moves an object 4.0 m in a direction at 60° to the force. What work is done?

100 J
200 J
173 J
12.5 J
2.

A 1200 kg car travels at 20 m s⁻¹. What is its kinetic energy?

1.2 × 10⁴ J
2.4 × 10⁵ J
4.8 × 10⁵ J
2.4 × 10⁴ J
3.

A 2.0 kg mass is raised through 5.0 m. What is its gain in gravitational potential energy? (g = 9.81 N kg⁻¹)

10 J
49 J
98 J
196 J
4.

A gas expands against a constant external pressure p, increasing its volume by ΔV. The work done by the gas is

p/ΔV
ΔV/p
½pΔV
pΔV
5.

Power is defined as

force multiplied by distance
energy multiplied by time
force per unit area
work done per unit time
6.

A car moves at a steady 30 m s⁻¹ against a total resistive force of 600 N. What is the useful power output?

20 W
1.8 kW
18 kW
180 kW
7.

A machine has an input power of 400 W and a useful output of 300 W. What is its efficiency?

25 %
75 %
133 %
70 %
8.

A ball is dropped from rest from a height of 20 m. Neglecting air resistance, what is its speed on reaching the ground? (g = 9.81 m s⁻²)

14 m s⁻¹
20 m s⁻¹
40 m s⁻¹
10 m s⁻¹
9.

The principle of conservation of energy states that energy

is always conserved as kinetic energy
is lost as heat in every process
cannot be created or destroyed, only transferred from one form to another
can be created by a machine
10.

The speed of a moving object is doubled. Its kinetic energy

doubles
is halved
increases by a factor of four
is unchanged
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