1. 1 Changes in energy stores List the different types of energy
Describe the change in energy stores for a torch and a wind up toy car
2 Conservation and dissipation of energy
- What is the law of the conservation of energy?
- What does energy dissipation mean?
3 Energy and work
- What is work done?
Write an equation for work done with force and distance moved
Include the units
Conservation and dissipation of energy F
7 Electrical power
- -- Give the definition of power
-How is power calculated using energy/work done and time?
Give an example of power using motors
t is power?
4 Gravitational potential energy Stores
Give a definition of GPE
Write an equation for GPE including GPE, height, mass and gravitational field strength
6 Energy and efficiency
What is the calculation for efficiency?
What is the calculation for power with efficiency?
If it was possible to be 100%efficient what does this mean?
5 Kinetic energy
Give a definition of kinetic energy
Write an equation including kinetic energy, mass and velocity
Write an equation to calculate elastic potential energy (not required to learn).

2. Changes in energy stores
Describe the changes in energy stores when you fire a bow and arrow
Give 3 examples of a system changing energy stores
Conservation and dissipation of energy
When a washing machine transfers electrical energy where does the electrical energy get transferred to?
If energy is conserved what do you notice about input and output energies?
Energy and work
Calculate the work done by a machine using a force of 25N to move a box up by 2.5m
What is work done if a ball is kicked 3m with a force of 21N?
Conservation and dissipation of energy F
Electrical power
What is the power if a radio transfers 20J of energy every 4s
What is the power of a TV if it transfers 6000J of energy in 5 minutes
Gravitational potential energy Stores
What is the increase in GPE if a box of 60kg is lifted 2.5m off the ground (g = 9.8N/kg)
What would happen to GPE if you were on the moon?
Energy and efficiency
What is the efficiency of a washing machine that transfers 1500J energy usefully and wastes 500J every second
How efficient is a 20W energy efficient light bulb if 12W are transferred as light every second
Kinetic energy
What is the kinetic energy of a parachutist of 75kg travelling at 50m/s?
Calculate KE of a road sweeper (mass 50kg) if it moves at 12m/s
If the road sweeper stops how much energy is dissipated in the brakes?