terms 4 as physics

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Physics terms for my as paper revision in January
Scalar quantities.
These are quanties that have got magnitude but no direction.
Examples
Distance
Power
Pressure
temperature
Speed
Frequency
Scalar quantities can be added and subtracted like normal numbers but they should have the
same units. Multiplying or dividing scalar quantities always gives a scalar quantity.
Vector quantities:
These have both magnitude and direction
Examples.
Weight, velocity, displacement, acceleration, force, momentum, electric field, magnetic field.
Displacement
This is a distance moved in a certain direction.
Equations to calculate displacement.
S= (U+V) X t (time) U is the initial velocity , V is the final velocity.
2
S = Vt ­ ½ at2
S = Ut + ½ at2
Velocity
Equations
V = U + at
V2 = U + 2 as
Acceleration
This refers to change in velocity over a given time.
Equation a= VU /2 OR a = F/m

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GRAPHS OF MOTION.
1. DISPLACEMENT TIME GRAPHS
The gradient is = the velocity, a straight line indicates a constant velocity.
The gradient at any point = to the velocity at that instant. This is called instantaneous
velocity.
2. Velocity ­time graphs
The area under the graph = the displacement
The gradient of the graph = the acceleration
FREE FALL.
Objects in free fall have the acceleration due to gravity of 9.81.…read more

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