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AQA GCSE Physics Unit 2.3

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Twenty questions on the third section of Unit 2 of AQA GCSE Physics: Work and energy.
Matthew T
Quiz by Matthew T, updated more than 1 year ago
Matthew T
Created by Matthew T over 10 years ago
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Question 1

Question
True or false? Work is done when an object is moved by a force.
Answer
  • True
  • False

Question 2

Question
True or false? Work uses a different SI unit to energy.
Answer
  • True
  • False

Question 3

Question
Into which form of energy does most energy become when work is done to overcome friction?
Answer
  • Thermal
  • Electric
  • Sound

Question 4

Question
True or false? Gravitational potential energy is energy stored in an object because of its position in the Earth's gravitational field.
Answer
  • True
  • False

Question 5

Question
What is the gravitational potential energy of an object of 0.5kg mass if it is lifted by 3m?
Answer
  • 1.5J
  • 3J
  • 15J
  • 10.5J

Question 6

Question
What is the power developed of an object which, when lifted, gains 60J in 10s?
Answer
  • 600W
  • 6W
  • 60W

Question 7

Question
True or false? Kinetic energy is the energy of an object when it is stationary.
Answer
  • True
  • False

Question 8

Question
Which of these is the correct formula for kinetic energy?
Answer
  • KE = 1/2 * m * v
  • KE = m * v
  • KE = 1/2 * m^2 * v
  • KE = m^2 * v
  • KE = 1/2 * m * v^2
  • KE = m * v^2

Question 9

Question
True or false? A system that stores energy when a vehicle brakes is known as a kinetic energy recovery system.
Answer
  • True
  • False

Question 10

Question
True or false? Momentum is a scalar quantity.
Answer
  • True
  • False

Question 11

Question
Which of these formulae is correct for calculating momentum?
Answer
  • p = m * v
  • p = m * v^2
  • p = m^2 * v
  • p = 2m * v
  • p = m * 2v

Question 12

Question
True or false? In a closed system, the total momentum before an event is equal to the total momentum after the event.
Answer
  • True
  • False

Question 13

Question
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?
Answer
  • 2.5m/s
  • 3m/s
  • 3.5m/s
  • 4m/s

Question 14

Question
True or false? In an explosion, the total momentum is zero.
Answer
  • True
  • False

Question 15

Question
True or false? If, in an explosion, two pieces of debris move apart, they will not move with equal and opposite momentum.
Answer
  • True
  • False

Question 16

Question
True or false? A front-end collision increases the momentum of the car.
Answer
  • True
  • False

Question 17

Question
What does a g-force of 2g mean?
Answer
  • The force applied on an object is half its weight
  • The force applied on an object is twice the gravitational field strength
  • The force applied on an object is twice its weight

Question 18

Question
True or false? If the impact time is increased, the impact force will be increased.
Answer
  • True
  • False

Question 19

Question
Which two of these features of car safety are compulsory by UK law?
Answer
  • Seat belts
  • Crumple zones
  • Collapsible steering wheels
  • Airbags
  • Side impact bars

Question 20

Question
True or false? Child car seats are mandatory in the UK for children younger than 12 years old or shorter than 1.35m.
Answer
  • True
  • False
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