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P2 Topic 3: Motions and Forces
Displacement: a straight line from start to finish. It is a quantity with a certain direction as it must go in a
straight line.
Speed: This tells you how quickly an object will travel a certain distance. It can worked out by the following…

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The acceleration tells you the change in velocity each second so the units of acceleration are metres per
second, per second. This is written as m/s2. An acceleration of 10m/s2 means that each second the velocity
increases by 10 m/s.
Acceleration is for both getting faster and getting slower.

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Forces can make objects change speed, shape or direction. A force is also a vector quantity because it has
both size and direction. Most objects have more than one force acting on them.
A free-body diagram shows the difference forces acting upon one object, with their size and direction.…

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o the mass of the object
If the same force is applied to two objects, the one with the smaller mass will accelerate more. If two objects
of difference mass are to have the same acceleration, then a large force must be applied to the object with
the greater mass.…

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When an object begins to fall from above the Earth, the only force acting on it is its weight. As it gains speed
air resistance begins to act in the opposite direction, reducing the resultant force.
The resultant force on the falling skydiver changes. As with all objects, eventually the…


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