P2b Forces in motion

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ema 🫶🏼

Cards (37)

Acceleration definition 
the rate of change of velocity
Conservation of Energy definition 
energy cannot be created or destroyed, only transferred between forces
Deceleration definition 
a negative acceleration (slowing down)
drag definition 
a force that acts opposite to the direction of motion of a body
elastic collision definition 
where momentum and kinetic energy is conserved
gravitational field strength definition 
the force on 1kg in a gravitational field; on earth it is 10N/KG
gravitational potential energy definition 
is the energy transferred to a gravity store when you lift an object in a gravitational field
inelastic collision definition 
a collision where only momentum is conserved
joule definition 
the unit of energy and work done
kinetic energy definition 
the energy anobject has when it’s moving
mass definition 
the amount of matter in a kilogram
momentum formula 
momentum = mass x velocity
power definition 
the rate at which work is done (how quickly it transfers energy)
recoil definition 
the backward movement (e.g. when a gun is fired)
scalar definition 
scalar quantities have only magnitude
vector definition 
vector quantities have magnitude and direction
velocity definition 
the rate of change of displacement
(displacement/time)
watt definition 
the unit of power (equal to one joule per second)
work done definition 
when energy is transferred from one form to another
examples of acceleration
speeding up
slowing down
changing direction
acceleration = change in velocity/time
(final velocity)2 - (initial velocity)2 = 2 x acceleration x distance
(alternative equation for acceleration)
gradient = change in y/change in x
examples of scalar quantities
mass
distance
speed
volume
energy
examples of vector quantities
force
displacement
velocity
acceleration
speed = distance/time
velocity is displacement/time
speed is distance/time
newtons third law 
if object A exerts a force on object B, object B will exert an equal and opposite force to force A, for every action there is an equal and opposite reaction
momentum = mass x velocity
conversation of momentum 
the total momentum of an isolated system does not change *as long as there is no resultant force*
momentum before = momentum after
when energy is transferred from one form to another we can say that work is done
work done = force x distance
kinetic energy is the energy of an object due to its motion, measured in joules (J)
kinetic energy = 0.5 x mass x velocity^2
gravitiational potential energy = mass x gravitational field strength x change in height
law of conservation of energy 
energy cannot be created or destroyed, it can only be transferred from one energy store to another