# physics

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difference between scalar and vector?
A scalar has only a magnitude (size) whereas a vector has both a magnitude and a direction.
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examples of scalars ?
distance, area, volume, speed, time, mass, energy, power, temperature, electric potential
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example of vectors?
displacement, velocity, acceleration, force, momentum, electric field strength, magnetic field strength
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2 ways to find resultant force?
pythagorus if perpendicular, adding/subtratcing if parallel
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what is a moment?
a force multiplied by perpendicular distance between the force and picot
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what is the principle of moments?
for an object to be in equilibrium, the sum of anticlockwise and clockwise moments must be equal (no turning point)
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when is an object in equilibrium?
sum of clockwise and anticlockwise moments are equal; all vertical /horizontal forces cancel
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what is a couple?
a pair of opposite and equal forces separated by distance (d) acting about point (p) the turning effect point (p) is EQUAL to one of the forces x the perpendicular distance between forces
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what is the centre of mass?
where all of an objects mass is thought to act about and moments cancel
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what is 1 newton?
force required to to accelerate 1kg by 1ms(-2)
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what is 1 joule?
the work done 1N through a distacne of 1m in direction of force
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t= square root (2s divided by g what is this for?
equation for a falling body
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v= square root (2ep/m or?
v2= 2gs
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gpe is often transfered as ?
kinetic energy
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w=?
sf
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p=?
fv
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newtons first law of inertia?
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
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newtons second law ?
Acceleration is produced when a force acts on a mass
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NEWTONS third law?
For every action there is an equal and opposite re-action.
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g=
v2/2s
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p=
fs/t
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h=
(1/2 x )V/g
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v=
u+gt
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f=
p/v
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## Other cards in this set

### Card 2

#### Front

examples of scalars ?

#### Back

distance, area, volume, speed, time, mass, energy, power, temperature, electric potential

### Card 3

#### Front

example of vectors?

### Card 4

#### Front

2 ways to find resultant force?

### Card 5

#### Front

what is a moment?