 # AQA GCSE Physics Unit 2.3

Quiz by , created about 5 years ago

## Twenty questions on the third section of Unit 2 of AQA GCSE Physics: Work and energy. 586 32 0  Created by Matthew T about 5 years ago
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### Question 1

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

### Question 2

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

### Question 3

Question
Into which form of energy does most energy become when work is done to overcome friction?
• 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.
• True
• False

### Question 5

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

### Question 6

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

### Question 7

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

### Question 8

Question
Which of these is the correct formula for kinetic energy?
• 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.
• True
• False

### Question 10

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

### Question 11

Question
Which of these formulae is correct for calculating momentum?
• 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.
• 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?
• 2.5m/s
• 3m/s
• 3.5m/s
• 4m/s

### Question 14

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

### Question 16

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

### Question 17

Question
What does a g-force of 2g mean?
• 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.
• True
• False

### Question 19

Question
Which two of these features of car safety are compulsory by UK law?