P1 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: annaheath1Created on: 31-05-17 10:13 How can energy be transferred? Heating, by waves, by an electric current, or by a force when it moves the object 1 of 16 What happens (in terms of energy) when an object falls as it gains speed its store of gravitational energy decreases and it's kinetic energy increases 2 of 16 Law of conservation of energy energy cannot be created or destroyed just transferred from one store to another 3 of 16 energy transferred= work done 4 of 16 work done = force applied x distance moved along the line of action of the force 5 of 16 when does GPE increase and why when an object moves up as work is done on it to overcome the gravitational force 6 of 16 change of gravitational potential store= mass x GFS x change of height 7 of 16 change in objects gravitational energy store= weight x change of height 8 of 16 what does the kinetic energy store of a moving object depend on= its mass and speed 9 of 16 kinetic energy = 0.5 x mass x speed(squared) 10 of 16 Elastic potential energy= 0.5 x spring constant x extension(squared) 11 of 16 What is useful energy energy in the place we want it and in the form we need it 12 of 16 the efficiency of a device= useful energy transferred by the device/total energy supplied to the device x100 13 of 16 power= energy transferred by the appliance/time taken for energy to be transferred 14 of 16 efficiency= useful power out/total power in x100 15 of 16 power wasted= total power in-useful power out 16 of 16
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