summary of describing motion

a summaary of the key points needed for the describing motion topic for As physics.

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Summary of describing motion physics topic 4
Distance and speed are scalar quantities. Displacement, velocity and acceleration are vectors.
They have direction.
-1 distance travelled (m) -1 displacement (m)
Average speed (ms ) = time taken (s) average velocity (ms ) = time taken (s)
-2 change in velocity (ms-1)
acceleration (ms ) = time taken(s)
Motion Graphs:

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The 4 equations of motion:
Use them only if the acceleration is constant.
Remember to use a sign convention to indicate the direction of vector quantities. When using
these equations with projectiles, we treat the horizontal and vertical motions completely
If we can ignore air resistance, all falling objects accelerate downwards at the same rate known
as the acceleration due to gravity, g. On earth g = 9.81 ms-1.
Terminal velocity is the maximum speed a moving object reaches.…read more

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