Movement & PositionEdexcel IGCSE Physics: Flashcards

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What is the equation for average speed?

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What is the equation for average speed?: average speed = distance moved / time taken
What does the gradient of a distance-time graph represent?: The speed of the object.
What does a flat (horizontal) line on a distance-time graph mean?: The object is stationary (not moving).
What is the equation for acceleration?: a = (v − u) / t, where v is final velocity and u is initial velocity
What are the units of acceleration?: metres per second squared, m/s²
What does the gradient of a velocity-time graph represent?: The acceleration of the object.
What does the area between a velocity-time graph line and the time axis represent?: The distance travelled by the object.
State the equation linking final speed, initial speed, acceleration and distance.: v² = u² + (2 × a × s)
On a velocity-time graph, what does a downward-sloping line indicate?: The object is decelerating (slowing down).
A cyclist travels 300 m in 60 s. Calculate their average speed.: average speed = 300 / 60 = 5 m/s
Why is reaction time a source of error when timing motion by hand?: Human reaction time in starting/stopping a stopwatch introduces small timing errors that affect the calculated speed.
An object accelerates from 4 m/s to 12 m/s in 4 s. Calculate its acceleration.: a = (12 − 4)/4 = 2 m/s²