# Physics P4 Explaining Motion

Flashcards by Erin Poppitt, updated more than 1 year ago
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### Description

Flashcards on Physics P4 Explaining Motion, created by Erin Poppitt on 03/18/2015.

## Resource summary

 Question Answer Symbols Speed = (M/S) - Metre per Second Distance = (M) - Metres Time Taken = (S) - Seconds / = Divide Acceleration = (M/S) to the power of 2 Momentum = (kg M/S) Mass = (kg) - Resultant Force = (N) - Newtons Speed Equation Speed = Distance Travelled / Time Taken Distance Equation Distance Travelled = Speed X Time Taken Time Taken Equation Time Taken = Distance Travelled / Speed Acceleration Equation Acceleration - Change in Velocity / Time Taken Distance - Time Graph Gradient = Speed Flat sections mean its Stationary Downhill means its going back to the start Steeping curve means its speeding up Levelling off Curve means its slowing down Calculate Distance - Time Graph Use scales on the Axis to work out the gradient Speed = Gradient = Vertical / Horizontal Velocity Velocity is a more useful measure of motion. It describes both speed and direction Velocity can be negative, for example is a car turns around Acceleration Change in Velocity or Speed Force Forces occur when 2 objects interact Reaction Force Example If a was on a table then the book is pushing down on the table with a force equal to the weight. The table also exerts an equal and opposite force Friction Friction is a reaction force - It happens as a result of an applied force Arrow on a Force - Diagram Length - Size of the Force Direction - Direction of the Force Reaction on a Surface If an object is resting on a surface it pushes downwards (because of its weight) Resultant Force Overall force acting on an object Momentum Equation Momentum = Mass X Velocity Car Safety Crumple Zones Airbags Seat Belts Work Done Energy Transferred Kinetic Energy Force Created by Movement Kinetic Energy Equation Kinetic Energy = 0.5 X Mass X Velocity Squared GPE GPE - Gravitational Potential Energy Height Energy GPE Equation GPE = Weight X Vertical Height Difference Falling Objects Means Kinetic Energy Gained = GPE Lost

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