Energy - Worksheets, Questions and Revision

16 original exam-style questions - 7 pages of questions with a full mark scheme - free printable PDF.

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GCSE · Physics

P1 Energy

AQA 8463 · Calculator allowed · about 70 minutes
Total Marks
Name: _______________________________    Date: ____ / ____ / ______
Answer ALL questions. Show all your working.
1
This question is about energy stores.
(a)A car is moving along a road. Which energy store is associated with the car's motion?(1)
  • A) Kinetic
  • B) Elastic potential
  • C) Chemical
  • D) Nuclear
(b)Name the energy store that increases when an object is lifted higher above the ground.(1)
(c)Name the energy store of a stretched spring.(1)
(Total for Question 1 is 3 marks)
2
Energy is conserved when it is transferred.
(a)State the principle of conservation of energy.(1)
(b)A ball is dropped from a height and falls towards the ground. Describe the main energy transfer that happens as the ball falls, before it hits the ground.(2)
(Total for Question 2 is 3 marks)
3
A car of mass 1200 kg is moving at a speed of 15 m/s. kinetic energy = 0.5 x mass x (speed)2
(a)Calculate the kinetic energy of the car.(3)
(b)The car later travels at 30 m/s. State the factor by which the kinetic energy has increased compared with when it travelled at 15 m/s, and explain your answer.(2)
(Total for Question 3 is 5 marks)
4
A climber of mass 60 kg climbs up a cliff. gravitational potential energy = mass x gravitational field strength x height. Take g = 9.8 N/kg.
(a)The climber rises to a height of 25 m. Calculate the gain in gravitational potential energy.(2)
(b)The climber then descends all the way back to the starting point. State the change in the climber's gravitational potential energy store for the descent.(1)
(Total for Question 4 is 3 marks)
5
A spring has a spring constant of 200 N/m and is stretched by an extension of 0.10 m. elastic potential energy = 0.5 x spring constant x (extension)2
(a)Calculate the elastic potential energy stored in the spring. Assume the limit of proportionality is not exceeded.(3)
(Total for Question 5 is 3 marks)
6
A beaker contains 2 kg of water at 20 degrees C. The water is heated to 100 degrees C. specific heat capacity of water = 4200 J/kg degrees C. change in thermal energy = mass x specific heat capacity x temperature change.
(a)Calculate the change in thermal energy of the water.(3)
(b)The water is heated by a 2800 W heater that transfers all of this energy to the water. Calculate the time taken. Use: power = energy transferred / time.(3)
(Total for Question 6 is 6 marks)
7
Power is the rate of energy transfer. power = energy transferred / time
(a)A kettle transfers 672000 J of energy in 200 s. Calculate the power of the kettle.(2)
(b)A heater has a power of 2000 W. Calculate the energy it transfers when switched on for 5 minutes. Give your answer in joules.(3)
(Total for Question 7 is 5 marks)
8
No device transfers all of its input energy usefully.
(a)Write down the equation used to calculate the efficiency of a device (as a decimal or a percentage).(1)
(b)An electric motor is supplied with 500 J of energy. Of this, 150 J is wasted as thermal energy and sound. Calculate the efficiency of the motor. Give your answer as a percentage.(3)
(Total for Question 8 is 4 marks)
9
A student investigates the specific heat capacity of a metal block. The 0.5 kg block is heated by an electric heater. The heater transfers 12000 J of energy to the block and the temperature of the block rises by 30 degrees C. specific heat capacity = energy transferred / (mass x temperature change)
(a)Calculate the specific heat capacity of the metal from the student's results. Give the unit with your answer.(2)
(b)The value the student calculates is higher than the true value for the metal. Suggest why not all of the 12000 J was transferred to the block.(1)
(c)Give one change the student could make to reduce this energy loss.(1)
(Total for Question 9 is 4 marks)
10
Machines and buildings can be designed to reduce unwanted energy transfers.
(a)Explain how lubricating the moving parts of a machine reduces the amount of energy that is wasted.(2)
(b)A house loses energy through its outer walls. Explain how filling the wall cavity with insulating material reduces this energy transfer.(2)
(Total for Question 10 is 4 marks)
11
Two outer walls of a building are the same thickness but are made from different materials. Wall X has a high thermal conductivity and wall Y has a low thermal conductivity.
(a)State which wall, X or Y, has the lower rate of energy transfer through it.(1)
(b)State two other factors, apart from thermal conductivity, that affect the rate of energy transfer through a wall.(2)
(Total for Question 11 is 3 marks)
12
Electricity can be generated using renewable and non-renewable energy resources.
Compare the use of one renewable energy resource and one non-renewable energy resource for generating electricity. In your answer include advantages and disadvantages of each.
(Total for Question 12 is 6 marks)
13
Energy resources can be classified as renewable or non-renewable.
(a)Name two renewable energy resources.(2)
(b)Give one disadvantage of using fossil fuels to generate electricity.(1)
(Total for Question 13 is 3 marks)
14
A lamp has a power of 30 W. power = energy transferred / time
(a)Calculate the energy the lamp transfers when it is switched on for 1 hour. Give your answer in kilojoules (kJ).(3)
(Total for Question 14 is 3 marks)
15
A ball of mass 0.5 kg is thrown vertically upwards. It leaves the thrower's hand at a speed of 8 m/s. Assume air resistance is negligible and take g = 9.8 N/kg. At the highest point, all of the ball's kinetic energy has been transferred to its gravitational potential energy store.
(a)Calculate the maximum height the ball reaches above the point where it left the hand.(4)
(Total for Question 15 is 4 marks)
16
When energy is transferred by a device, some energy is dissipated.
(a)What is meant by energy being dissipated?(1)
(b)A phone battery transfers 3000 J of energy while charging a phone. Of this, 2400 J is transferred usefully. Calculate the energy dissipated and the efficiency of the charging process.(3)
(Total for Question 16 is 4 marks)
Mark scheme · P1 Energy

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16