Changes in energy stores List the different types of energy stores and how they are transferred Describe the change in energy stores for a torch and a toy car Conservation and dissipation of energy - What is the law of the conservation of energy? What does energy dissipation mean? Describe useful and wasted enegy Energy and work - What is work done? - Write an equation triangle with units including work done, force and distance Conservation and dissipation of energy H 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? Gravitational potential energy Stores Give a definition of GPE Write an equation triangle including GPE, height, mass and gravitational field strength Energy and efficiency How is energy efficiency calculated? What is the calculation for power efficiency? What does efficiency mean? Kinetic energy Give a definition of kinetic energy Write an equation triangle including kinetic energy, mass and velocity Write an equation to calculate elastic potential energy (not required to learn).

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? What does conservation of energy tell you? Energy and work Calculate the work done by a machine using a force of 25N to move a box up by 2.5m If the work done to move a ball 3m is 65J what force was used? Conservation and dissipation of energy H 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? What is the max speed of a road sweeper (mass 50kg) if 2500J of kinetic energy is transferred