how fast something is moving, regardless of direction

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Displacement (s)

how far an object's travelled from its starting point in a given direction

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Velocity (v)

the rate of change of an object's displacement

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Acceleration (a)

the rate of change of an object's velocity

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Instantaneous speed

the speed of an object at any given point

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Gravitational field strength (g) [on earth]

9.81 Nkg^-1

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Projectile

an object which is given an initial velocity and then left to move freely under gravity

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Newtons 1st Law

states that the velocity of an object will not change unless a resultant force acts on it

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Newtons 2nd Law

resultant force (N) = mass (kg) x acceleration (ms^-2)

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Newtons 3rd Law

If object A exerts a force on object B, then object B will exert an equal but opposite direction force on object A

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Momentum

p=mv , dependant upon mass and velocity

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Work

amount of energy transferred from one form to another when a force causes a movement of some sort (joules)

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Power

rate of doing work / amount of energy transferred from one from to another per second

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Watt

rate of energy transfer equal to 1 joule per second (Js^-1)

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Efficiency

a measure of how well a device converts the energy you put in into the energy you want it to give out

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Centre of Gravity

is the single point that you can consider an b=objects whole weight to act through (whatever its orientation)

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Principle of moments

states that for a body to be in equilibrium, the sum of the clockwise moments about any point equals the sum of the anti clockwise moments about the same point

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Other cards in this set

Card 2

Front

has direction and magnitude (size)

Back

Vector quantity

Card 3

Front

how fast something is moving, regardless of direction

Back

Card 4

Front

how far an object's travelled from its starting point in a given direction

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