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This lesson covers speed, velocity, and distance-time graphs — as required by the Edexcel GCSE Physics specification (1PH0), Topic 1: Key Concepts of Physics. You need to be able to calculate speed and velocity, recall typical speeds, and interpret distance-time graphs.
Speed is a scalar quantity that measures how fast an object is moving. It is defined as the distance travelled per unit time.
speed = distance ÷ time
s=td
Where:
This can be rearranged:
Exam Tip: Remember the formula triangle — put d on top, s and t on the bottom. Cover the quantity you want to find: d = s × t, s = d/t, t = d/s.
Velocity is a vector quantity — it is the speed in a given direction, or more precisely, the rate of change of displacement.
velocity = displacement ÷ time
v=tx
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