886197
Pregunta 1
Pregunta
True or false? Work is done when an object is moved by a force.
Respuesta
- True
- False
Pregunta 2
Pregunta
True or false? Work uses a different SI unit to energy.
Respuesta
- True
- False
Pregunta 3
Pregunta
Into which form of energy does most energy become when work is done to overcome friction?
Respuesta
-
Thermal
-
Electric
-
Sound
Pregunta 4
Pregunta
True or false? Gravitational potential energy is energy stored in an object because of its position in the Earth's gravitational field.
Respuesta
- True
- False
Pregunta 5
Pregunta
What is the gravitational potential energy of an object of 0.5kg mass if it is lifted by 3m?
Respuesta
-
1.5J
-
3J
-
15J
-
10.5J
Pregunta 6
Pregunta
What is the power developed of an object which, when lifted, gains 60J in 10s?
Respuesta
-
600W
-
6W
-
60W
Pregunta 7
Pregunta
True or false? Kinetic energy is the energy of an object when it is stationary.
Respuesta
- True
- False
Pregunta 8
Pregunta
Which of these is the correct formula for kinetic energy?
Respuesta
-
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
Pregunta 9
Pregunta
True or false? A system that stores energy when a vehicle brakes is known as a kinetic energy recovery system.
Respuesta
- True
- False
Pregunta 10
Pregunta
True or false? Momentum is a scalar quantity.
Respuesta
- True
- False
Pregunta 11
Pregunta
Which of these formulae is correct for calculating momentum?
Respuesta
-
p = m * v
-
p = m * v^2
-
p = m^2 * v
-
p = 2m * v
-
p = m * 2v
Pregunta 12
Pregunta
True or false? In a closed system, the total momentum before an event is equal to the total momentum after the event.
Respuesta
- True
- False
Pregunta 13
Pregunta
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?
Respuesta
-
2.5m/s
-
3m/s
-
3.5m/s
-
4m/s
Pregunta 14
Pregunta
True or false? In an explosion, the total momentum is zero.
Respuesta
- True
- False
Pregunta 15
Pregunta
True or false? If, in an explosion, two pieces of debris move apart, they will not move with equal and opposite momentum.
Respuesta
- True
- False
Pregunta 16
Pregunta
True or false? A front-end collision increases the momentum of the car.
Respuesta
- True
- False
Pregunta 17
Pregunta
What does a g-force of 2g mean?
Respuesta
-
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
Pregunta 18
Pregunta
True or false? If the impact time is increased, the impact force will be increased.
Respuesta
- True
- False
Pregunta 19
Pregunta
Which two of these features of car safety are compulsory by UK law?
Respuesta
-
Seat belts
-
Crumple zones
-
Collapsible steering wheels
-
Airbags
-
Side impact bars
Pregunta 20
Pregunta
True or false? Child car seats are mandatory in the UK for children younger than 12 years old or shorter than 1.35m.
Respuesta
- True
- False
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