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TOPIC 3 ­ Motion and forces
Displacement, velocity, acceleration and force are vector quantities
(has a size and a direction).
Displacement is the distance travelled in a straight line.
Velocity is how fast an object is going at a particular direction.
Acceleration is how fast an objects velocity is…

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Curve = changing acceleration

The steeper the line, the greater the acceleration

Area under the graph = distance travelled

Acceleration is how quickly velocity is changing

This change in velocity can be a change in speed or direction or


Acceleration (metre per second square, m/s s) = change…

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Resultant force (newton, N) = mass (kilogram, Kg) x acceleration
(metre per second square, m/s2)

Weight and mass:

Weight and mass are not the same.
Mass is a measure of how much stuff is in an object and it is
measured in kilograms, weight is a force measured in Newtons…

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In space all objects accelerate at exactly the same rate. So on the
moon two things dropped will hit the ground together because
there is no air in vacuum therefore there is no air resistance to
slow down the object.

Newton's three laws of motion

1. A body will remain…


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