AS level OCR Physics Summary Paper with term Definitions and Studt Guide

Prefix units Uncertainties Adding or subtracting- Add the absolute uncertainties Multiplying or dividing- Add the percentage uncertainties Raising to a power- Multiply the percentage uncertainties by the power Percentage uncertainty in the gradient uncertainty = ½(line of best fit - line of worst fit) Percentage uncertainty = uncertainty ÷ gradient of best fit line (× 100) Speed Rate of change of distance Displacement The distance an object has travelled in a given direction Velocity Rate of change of displacement Acceleration Rate of change of velocity Scalars mass, time, temperature, speed, energy Vectors displacement, force, velocity, acceleration Velocity= u + at Acceleration Change in velocity divided by time Displacement= Average velocity × Time Displacement= ut + ½at² Velocity²= u² + 2as Gravitational field strength 9.81 N / Kg Displacement= ½gt² Velocity= gt Displacement= vt / 2 Velocity²= 2gs Horizontal velocity= V × Cos θ Vertical velocity= V × Sin θ Displacement Area under velocity-time graph Time taken= Number of frames × (1 second / frame rate) Stopping distance= Thinking distance + Braking distance Horizontal force= Force × Cos θ Vertical force= Force × Sin θ Inertia Resistance to a change in velocity Pressure= h × ρ(density) × g When the force isn't in the same direction as the movement W= F × x × Cos θ P= F × v × Cos θ Power= Force × Velocity K.E.= Work done K.E.= Force × Displacement K.E.= Mass × Acceleration × Displacement Hooke's law Force is proportional to extension K Force constant K in series 1/K = 1/K1 + 1/K2 K in parallel K = K1 + K