Forces

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what is a scalar
scalars only have magnituge - e.g. tempreture, distance, speed, time, mass
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what is a vector
vectors have magnitude and direction- e.g. displacment, velocity, acceleration, momentum
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what is a non-contact force
when the objects are physically separated - e.g. magnetic, gravitational
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what is a contact force
when the objects are physically touching - e.g. friction, air resistance
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what is a resultant force
when 2 or more forces are acting on an object, the motion of the objects depends on a the combination of all these forces. the combination of the forces is called the resultant, it can be thought to be a single force that could replace a forcesactin
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what is mass
mass is the amount of matter in an object
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what is weight
weight is the force acting on an object due to gravity, the force of gravity depends on the gravitational field around the earth
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what us the equation for weight
weight = mass x gravitational field strength
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what is workdone
this is when a force move an object and when energy is transferred and work is done
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what is the equation for work done
work done = force x distance moved in the direction of the force
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what does hooks law state
it states that the extension of the a spring is directly proportional to the load, provided the limit of proportionality has been exceeded
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what is the equation for force
force = spring constant x extension
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what is the equation for elastic potential
elastic potential energy = 0.5 x spring constant x extension2 (1/2ke2)
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what is the equation fore moment of force
moment of force = force x distance (M=Fd)
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what happens if an object is balanced
anticlockwise moments = clockwise moments (f1 d1 = f2 d2)
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what is the equation for pressure
pressure = force/area
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what is the equation for pressure in a fluid
pressure = height of the column x density of the liquid x gravitational field strength (p=hpg)
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what is the equation for speed
speed = distance/ time
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what is the equation for average speed for a journey
average speed = total distance/ total time
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what is the equation for acceleration
acceleration = change in velocity/ timeth
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what is the equation for resultant force
resultant force = mass x acceleration
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what is newtons first law
an object at rest stays at rest and an object that is moving continues to move at a constant speed, unless acted on by an unbalanced forced
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what is the equation for stopping distance
stopping distance = thinking distance + braking distance
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what is the equation for momentum
momentum = mass x velocity (p= mv)
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what does force equal
force = rate of change of momentum
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Other cards in this set

Card 2

Front

what is a vector

Back

vectors have magnitude and direction- e.g. displacment, velocity, acceleration, momentum

Card 3

Front

what is a non-contact force

Back

Preview of the front of card 3

Card 4

Front

what is a contact force

Back

Preview of the front of card 4

Card 5

Front

what is a resultant force

Back

Preview of the front of card 5
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