# Physics equations

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speed
speed (m/s) = distance (m) / time (s)
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velocity
speed in a particular direction
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distance
area under a graph
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scalar
only has magnitude
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vector
has both size and direction
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acceleration
acceleration (m/s2) = initial velocity - final velocity (m/s) / time taken (s)
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newtons first law
states that an object at rest will remain at rest unless acted upon by a force. An object moving in a straight line with a constant velocity will continue to do so unless acted upon by a force.
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newtons second law
states that when there is a resultant force acting on an object, the object will accelerate. Resultant force is directly proportional to acceleration.
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resultant force
resultant force (N) = mass (kg) x acceleration (m/s2)
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stopping distance
stopping distance (m) = thinking distance + braking distance
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hookes law
states that the extension of a material (e.g. spring/wire) is proportional to the force applied, provided that the elastic limit is not exceeded.
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elastic behaviour
an extended material returns to its original size and shape when the deforming force is removed.
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plastic behaviour
an extended material retains part of its extension when the deforming force is removed.
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work done (energy transferred)
work done (J) = force (N) x distance (m)
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power
power (w) = work done (J) / time (s)
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work done
GPE (mgh)
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mgh
mgh = 1/2mv2 = KE = GPE
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momentum
momentum (kgm/s) = mass (kg) x velocity (m/s) (p=mv)
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total momentum
total momentum before collision = total momentum after collision
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force (+ momentum)
force (N) = change in momentum (kgm/s) / time (s)
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elastic collision
KE before collision = KE after collision
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inelastic collision
2 objects collide and stick together, KE before collision doesn't = KE after collision.
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current
current (amps, A) = charge (coulombs, C) / time (s) (I = Q/T)
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resistance
resistance (ohms) = voltage (v) / current (A)
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ohms law
states that the current passing through a conductor is directly proportional to the voltage across it, provided the temperature remains constant.
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DC
DC= direct current
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AC
AC = alternating current
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voltage
voltage (v) = energy transferred (J) / charge (c)
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power
power (w) = voltage x current
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frequency
frequency (Hz) = wave speed (m/s) / wavelength (m)
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density
density (kg/m3) = mass (kg) / volume (m3)
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pressure
pressure (Pa) = Force (N) / Area (m2)
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pressure (and density)
pressure = density x 10 x height (P=pgh)
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useful energy
useful energy = efficiency x total energy input
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energy
power (w) x time (s)
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moment
force x distance or anticlockwise- clockwise
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anticlockwise and clockwise
sum of clockise moments = sum of anticlockwise moments
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## Other cards in this set

### Card 2

velocity

#### Back

speed in a particular direction

### Card 3

distance

#### Back ### Card 4

scalar

#### Back ### Card 5

vector

#### Back Report

work done = force x distance

power = energy transferred/ time

work done = GPE

force = change in momentum/ time

voltage = energy transferred / charge

energy = power x time

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