# Physics

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• Physics
• Speed (Distance time graphs)
• Measure of how far an object moves in a given time
• Average speed= Distance travelled/Time taken
• Velocity (Velocity time graphs)
• The speed and direction in which an object is moving
• Area under the line= Distance travelled
• To work out area of triangle on graph: Base x Height/2
• Acceleration
• Measure of how quick its velocity changes
• De/Acceleration= Change in speed/Time
• Change in speed (m/s)
• Time taken (s)
• Acceleration (m/s 2)
• Forces
• Reaction force
• Upwards force
• Resultant force
• The force that is left when you add all the forces acting on an object
• If forces are balanced, speed and direction of object will remain
• If forces are unbalanced, speed and direction of object may change
• Force= Mass x Acceleration
• Mass (kg)
• Force (N)
• Weight
• Weight= Mass x Gravitational field strength
• Weight (N)
• Gravitational field strength (N/kg)
• Terminal velocity
• Top speed reached when there is no resultant force