WJEC GCSE Physics 3 Motion and Collision

Motion and collision revision notes

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  • Created on: 23-05-12 10:41
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Triple Physics Revision Notes:
Motion and Collision
Speed, Velocity and Motion:
Speed is simply how fast you're going- distance/ time. This is usually measured in ms-1 in physics
Velocity is the speed of an object, in a given direction. Therefore it includes speed, as above, as well
as a direction. If the object is going forwards (usually to the right) then the velocity will be +ve,
however, if it is going backwards (to the left), then the velocity will be ­ve.
Motion is just another word for movement
Velocity-time graphs:
SUVAT Equations:
s/x ­ distance m/ km/ miles
u- initial velocity ms-1/ kms-1
v- final velocity ms-1/ kms-1
a- acceleration ms-2/ kms-2
t- time s

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This is the quantity of motion of a moving body- the speed and strength at which it's moving.
Momentum can be either positive or negative, and cannot be created (from nothing) or destroyed,
only transferred from one object to another- during collision. It is measured in kgms-1 as it takes into
account both mass and velocity.…read more

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Velocity is a vector quantity, therefore it takes into account both force (speed) and direction. Since it
is velocity which is used to calculate acceleration, acceleration is also a vector. An object can,
therefore, accelerate without changing its speed.
For example, a Ferris wheel spins at a constant speed, but the direction of each of the cars changes,
therefore so does the velocity, therefore so does the acceleration.
The resultant force will balance out and acct towards the centre of the circle.…read more

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The following formula page will be at the front of the Physics 3 exam…read more


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