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Speed, Velocity and Acceleration

Chapter summary, hard words and model exam answers for ICSE Class 10 Hindi.

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Physics · CBSE 10 · ICSE 10 · GCSE (AQA, Edexcel, OCR)

A speedometer shows instantaneous speed. Average speed uses total distance over total time.

Two objects at the same speed can have different velocities if they head different ways.

Speeding up, slowing down, or turning all count as acceleration. Slowing down is negative acceleration.

A flat line means steady velocity (zero acceleration); a straight slope means uniform acceleration.

scalar	a quantity with size only and no direction, such as speed or distance
vector	a quantity with both size and direction, such as velocity or acceleration
displacement	the straight-line distance and direction from start to finish
velocity	the rate of change of displacement, measured in metres per second
acceleration	the rate of change of velocity, measured in metres per second squared
deceleration	negative acceleration; the slowing down of an object
uniform motion	movement at constant velocity, so the acceleration is zero
instantaneous speed	the speed of an object at one particular instant, as on a speedometer

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