Frage 1
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True or false? Work is done when an object is moved by a force.
Frage 2
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True or false? Work uses a different SI unit to energy.
Frage 3
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Into which form of energy does most energy become when work is done to overcome friction?
Frage 4
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True or false? Gravitational potential energy is energy stored in an object because of its position in the Earth's gravitational field.
Frage 5
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What is the gravitational potential energy of an object of 0.5kg mass if it is lifted by 3m?
Frage 6
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What is the power developed of an object which, when lifted, gains 60J in 10s?
Frage 7
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True or false? Kinetic energy is the energy of an object when it is stationary.
Frage 8
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Which of these is the correct formula for kinetic energy?
Antworten
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KE = 1/2 * m * v
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KE = m * v
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KE = 1/2 * m^2 * v
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KE = m^2 * v
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KE = 1/2 * m * v^2
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KE = m * v^2
Frage 9
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True or false? A system that stores energy when a vehicle brakes is known as a kinetic energy recovery system.
Frage 10
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True or false? Momentum is a scalar quantity.
Frage 11
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Which of these formulae is correct for calculating momentum?
Antworten
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p = m * v
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p = m * v^2
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p = m^2 * v
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p = 2m * v
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p = m * 2v
Frage 12
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True or false? In a closed system, the total momentum before an event is equal to the total momentum after the event.
Frage 13
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Trolley A, 6kg, is travelling in one direction at 4m/s. Trolley B, 7kg, is travelling in the other direction at 3m/s. The two trolleys stick together and move off. What is the velocity of the two trolleys?
Frage 14
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True or false? In an explosion, the total momentum is zero.
Frage 15
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True or false? If, in an explosion, two pieces of debris move apart, they will not move with equal and opposite momentum.
Frage 16
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True or false? A front-end collision increases the momentum of the car.
Frage 17
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What does a g-force of 2g mean?
Antworten
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The force applied on an object is half its weight
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The force applied on an object is twice the gravitational field strength
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The force applied on an object is twice its weight
Frage 18
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True or false? If the impact time is increased, the impact force will be increased.
Frage 19
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Which two of these features of car safety are compulsory by UK law?
Frage 20
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True or false? Child car seats are mandatory in the UK for children younger than 12 years old or shorter than 1.35m.