Energy - Shed Loads of Practice Questions

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Energy Stores

Remember to use the appropriate energy equations and conversion factors to perform the calculations. Also, ensure that the units are consistent when performing the calculations.

Question 1:

A 5 kg object is at a height of 10 meters above the ground. Calculate its gravitational potential energy.

Question 2:

A car with a mass of 1000 kg is travelling at a speed of 20 m/s. Calculate its kinetic energy.

Question 3:

A spring has a spring constant of 200 N/m and is compressed by 0.2 meters. Calculate the elastic potential energy stored in the spring.

Question 4:

A 2 kg ball is thrown vertically upwards with an initial velocity of 10 m/s. Calculate its maximum gravitational potential energy.

Question 5:

A 5 tonne roller coaster starts at a height of 30 meters and finishes at a height of 10 meters. Calculate the change in gravitational potential energy of the roller coaster.

Question 6:

A battery with a potential difference of 12 volts provides a charge of 5000 coulombs to a device. Calculate the electrical energy supplied by the battery.

Question 7:

A 50 kg person climbs a flight of stairs, increasing their gravitational potential energy by 2000 joules. Calculate the height of the stairs.

Question 8:

A car engine produces 5000 joules of kinetic energy. If the car's mass is 1000 kg, calculate its speed.

Question 9:

A 200 g toy car is powered by a rubber band. If the rubber band stores 100 joules of elastic potential energy when stretched, calculate the stretch potential energy per gram.

Question 10:

A 60 kg person runs up a hill, increasing their kinetic energy by 1200 joules. Calculate their speed at the top of the hill, assuming they started from rest.

Question 11:

A 20 kg mass is attached to a spring with a spring constant of 100 N/m. Calculate the maximum compression of the spring when the mass is pushed down and released, neglecting any external forces.

  • Q1

    490 J

    Q2

    200000 J

    Q3

    4 J

    Q4

    100 J

    Q5

    980000 J

    Q6

    60000 J

    Q7

    4.08 m

    Q8

    3.16 m/s

    Q9

    0.5 J/g

    Q10

    15.5 m/s

    Q11

    1.96 m

Energy Efficiency

Remember to use the formula for energy efficiency: Energy Efficiency = Useful energy output / Total energy input × 100%. Also, ensure that the units are consistent when performing the calculations.

Question 1:

A light bulb converts 100 J of electrical energy into light energy and 40 J into heat energy. Calculate the energy efficiency of the light bulb.

Question 2:

A solar panel receives 5000 J of solar energy and converts 1500 J into electrical energy. Calculate the energy efficiency of the solar panel.

Question 3:

A machine does 400 J of useful work while consuming 1000 J of electrical energy. Calculate the energy efficiency of the machine.

Question 4:

A wind turbine converts 3000 J of wind energy into 2400 J of electrical energy. Calculate the energy efficiency of the wind turbine.

Question 5:

A refrigerator consumes 1500 J of electrical energy to remove 400 J of heat energy from its interior. Calculate the energy efficiency of the refrigerator.

Question 6:

A car engine consumes 5000 J of chemical energy from fuel and produces 3000 J of useful work. Calculate the energy efficiency of the car engine.

Question 7:

A heating element in an electric heater converts 200 J of electrical energy into 180 J of heat energy. Calculate the energy efficiency of the heating element.

Question 8:

A hydraulic lift raises an object by doing 4000 J of work while consuming 6000 J of hydraulic energy. Calculate the energy efficiency of the hydraulic lift.

Question 9:

A wind turbine receives 8000 J of wind energy and converts 6000 J into electrical energy. Calculate the energy efficiency of the wind turbine.

Question 10:

A solar water heater receives 3000 J of solar energy and transfers 2400 J to heat water. Calculate the energy efficiency of the solar water heater.

Question 11:

A fluorescent lamp converts 80 J of electrical energy into light energy and 20 J into heat energy. Calculate the energy efficiency of the fluorescent lamp.

  • Question 1:

    0.4

    Question 2:

    0.3

    Question 3:

    0.4

    Question 4:

    0.8

    Question 5:

    0.27

    Question 6:

    0.6

    Question 7:

    0.9

    Question 8:

    0.67

    Question 9:

    0.75

    Question 10:

    0.8

    Question 11:

    0.25

Heating and Work Done

Remember to use the appropriate formulas for calculating heating and work done. Also, ensure that the units are consistent when performing the calculations.

Question 1:

A 100 g piece of copper gains 1500 J of thermal energy when heated. Calculate the increase in temperature of the copper. (Specific heat capacity of copper = 390 J/kg°C)

Question 2:

A kettle uses 2000 J of electrical energy to heat 500 ml of water. Calculate the increase in temperature of the water. (Assume no heat loss to the surroundings.)

Specific heat capacity of water is 4200 J/kg°C and density of water is 1000 kg/m$^3$.

Work Done Calculation Questions:

Question 3:

A force of 20 N is applied to push a cart a distance of 5 meters. Calculate the work done on the cart.

Question 4:

A person lifts a 10 kg box vertically upwards to a height of 2 meters. Calculate the work done against gravity.

Question 5:

A car engine delivers 4000 J of useful work while consuming 6000 J of chemical energy from fuel. Calculate the efficiency of the car engine.

Question 6:

A crane lifts a 500 kg load vertically to a height of 15 meters. Calculate the work done by the crane.

Question 7:

A machine exerts a force of 100 N to move an object a distance of 8 meters. Calculate the work done by the machine.

Question 8:

A person uses a force of 50 N to push a lawn mower a distance of 20 meters. Calculate the work done on the lawn mower.

  • Question 1:

    38.5 °C

    Question 2:

    0.5 °C

    Work Done Calculation Questions:

    Question 3:

    100 J

    Question 4:

    196 J

    Question 5:

    0.67

    Question 6:

    73500 J

    Question 7:

    800 J

    Question 8:

    1000 J

Specific Heat Capacity

Remember to use the formula for specific heat capacity: Specific Heat Capacity = Thermal Energy / (Mass × Temperature Change). Also, ensure that the units are consistent when performing the calculations.

Question 1:

A 500 g block of metal is heated from 25°C to 85°C with an input of 3000 J of thermal energy. Calculate the specific heat capacity of the metal.

Question 2:

A 2 kg mass of water is heated from 10°C to 50°C with an input of 336,000 J of thermal energy. Calculate the specific heat capacity of water.

Question 3:

A 0.2 kg block of wood is heated from 20°C to 80°C with an input of 1200 J of thermal energy. Calculate the specific heat capacity of wood.

Question 4:

A 100 g sample of aluminium is heated from 15°C to 45°C with an input of 2000 J of thermal energy. Calculate the specific heat capacity of aluminium.

Question 5:

A 300 g sample of oil is heated from 25°C to 75°C with an input of 4500 J of thermal energy. Calculate the specific heat capacity of the oil.

Question 6:

A 0.5 kg piece of copper is heated from 25°C to 75°C with an input of 9750 J of thermal energy. Calculate the specific heat capacity of copper.

Question 7:

A 400 g block of metal is heated from 30°C to 90°C with an input of 2400 J of thermal energy. Calculate the specific heat capacity of the metal.

Question 8:

A 1 kg mass of water is heated from 20°C to 70°C with an input of 210000 J of thermal energy. Calculate the specific heat capacity of water.

Question 9:

A 0.3 kg block of wood is heated from 15°C to 45°C with an input of 1800 J of thermal energy. Calculate the specific heat capacity of wood.

Question 10:

A 200 g sample of aluminium is heated from 10°C to 50°C with an input of 1000 J of thermal energy. Calculate the specific heat capacity of aluminium.

Question 11:

A 500 g sample of oil is heated from 20°C to 80°C with an input of 3000 J of thermal energy. Calculate the specific heat capacity of the oil.

Question 12:

A 0.8 kg piece of copper is heated from 20°C to 60°C with an input of 12480 J of thermal energy. Calculate the specific heat capacity of copper.

  • Question 1:

    100 J/kg°C

    Question 2:

    4200 J/kg°C

    Question 3:

    100 J/kg°C

    Question 4:

    666.7 J/kg°C

    Question 5:

    300 J/kg°C

    Question 6:

    390 J/kg°C

    Question 7:

    120 J/kg°C

    Question 8:

    4200 J/kg°C

    Question 9:

    200 J/kg°C

    Question 10:

    125 J/kg°C

    Question 11:

    100 J/kg°C

    Question 12:

    390 J/kg°C

Power

Remember to use the formula for power: Power = Work Done / Time Taken or Power = Energy Consumed / Time Taken. Also, ensure that the units are consistent when performing the calculations.

Question 1:

A motor does 5000 J of work in 10 seconds. Calculate the power output of the motor.

Question 2:

A light bulb consumes 60 J of electrical energy in 2 seconds. Calculate the power rating of the light bulb.

Question 3:

A car engine delivers 3000 J of useful work in 20 seconds. Calculate the power output of the car engine.

Question 4:

A machine lifts a 200 kg load to a height of 5 meters in 10 seconds. Calculate the power used by the machine.

Question 5:

A wind turbine generates 4000 J of electrical energy in 5 seconds. Calculate the power output of the wind turbine.

Question 6:

A microwave oven consumes 1500 J of electrical energy in 30 seconds. Calculate the power rating of the microwave oven.

Question 7:

A cyclist does 500 J of work to move a bike a distance of 100 meters in 20 seconds. Calculate the cyclist's power output.

Question 8:

A computer consumes 100 J of electrical energy in 2 seconds. Calculate the power rating of the computer.

Question 9:

A hydraulic press does 10000 J of work in 5 seconds. Calculate the power output of the hydraulic press.

Question 10:

A water pump lifts 500 kg of water to a height of 10 meters in 60 seconds. Calculate the power used by the water pump.

Question 11:

A hairdryer consumes 1200 J of electrical energy in 10 seconds. Calculate the power rating of the hairdryer.

Question 12:

A factory machine does 8000 J of work in 4 seconds. Calculate the power output of the factory machine.

  • Question 1:

    500 W

    Question 2:

    30 W

    Question 3:

    150 W

    Question 4:

    980 W

    Question 5:

    800 W

    Question 6:

    50 W

    Question 7:

    25 W

    Question 8:

    50 W

    Question 9:

    2000 W

    Question 10:

    816.7 W

    Question 11:

    120 W

    Question 12:

    2000 W