Aqa Gcse Physics -Paper 2 Study Guide Questions And Correct Answers

Hooke's Law {Ans: The extension of an elastic object is directly proportional to the force applied as long as the limit of proportionality is not exceeded:}Radio waves {Ans: Radio waves can be produced by oscillations in electrical circuits. They may also induce current into an electrical circuit. This is because when the radio waves are absorbed, they may create and alternating frequency with the same frequency of the radio wave. Radio waves can also be dangerous as they can penetrate the body and cause internal heating.}Electric motors (motor effect) {Ans: 1. Coil placed in magnetic field 2. Coil experiences a force, rotating it 3.To keep the coil moving in one direction, a split ring commutator reconnects the two sides of the coil every half-turn}Moment meaning {Ans: The turning effect of a force is called its 'moment'}Big Bang theory {Ans: This states that the universe began from a very small, hot and dense region. This exploded, creating the universe and spreading matter across it. Red-shifting supports the Big Bang Theory and since 1998 observations showed that the universe is expanding, therefore it must have been at one singularity in the past of supernovae suggest distant galaxies