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| Question | Answer |
| Forces | Resultant force = 0 forces are balanced object either stationary or travelling at constant speed |
| Friction | Tries to slow moving objects down created when two objects/surfaces move past each other When moves through air - air resistance |
| Friction between tyre and road is affected by: | - inflation pressure of tyre - the road surface - surface condition caused by weather e.g. rain |
| Acceleration | Force = mass x acceleration Acceleration is measured in ms power of -2 |
| Thinking Distance | time to react affected by drinking and drugs |
| Braking Distance | time to halt from being applied affected by weather and brake/tyre condition |
| Thinking distance + Braking distance | Stopping distance |
| Terminal Velocity | Fall at steady speed |
| Describe Terminal Velocity | when object falls gravity has more force than frictional forces which causes object to accelerate as speed increases so does drag, which reduces acceleration Weight can't get any bigger so you reach terminal velocity |
| Mass | measure of the amount of "matter" a body has |
| Weight | measure of mass within a gravity |
| Gravitational Potential Energy | when an object is lifted vertically, work is done against the force of gravity |
| Work | force x distance moved joules = N x m |
| Kinetic energy | Anything that moves Moving car has lots of KE so to slow it down energy is lost i.e. kinetic energy KE = 1/2 mass x speed |
| Factors affecting amount of KE moving object has: | Velocity and Mass |
| Momentum | Greater the mass of an object and faster it's moving, harder it is to stop object momentum = mass x velocity |
| Produce a bigger change in momentum by | using a bigger force and applying it for a longer time |
| Velocity | speed in particular dierction |
| Power | Rate of doing work Power = work done divided by time taken Energy = power x time |
| Mains Electricity | |
| Fuse | device used to protect devices from a current that is too high |
| Static Electricity | due to the transfer of electricity from one surface to another |
| Current | rate of flow of charge current = charge / time |
| Voltage | work done / Charge |
| Resistance | voltage / current |
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