State the name for the energy gained by the blocks as they are lifted onto the platform.
State how the energy gained by 40 blocks when lifted by the man compares with the energy gained by 40 blocks when lifted by the machine.
The four situations below are described. Indicate which ones involve work being done. Place a tick (✓) in every correct box. A child is sitting at the top of the stairs. A picture is hanging on a wall. A student is stretching a spring. A person is moving a chair.
Electrical appliances transfer energy, and some of the transferred energy is useful. Draw a line from each electrical appliance to the correct useful energy output. Draw only three lines. Electrical appliance: torch, radio, electric fan. Useful energy output: sound, light, chemical, kinetic.