AQA · Physics · 8463
GCSE Physics: Describing motion along a line
Forces · AQA GCSE Physics (8463), specification point 4.5.6.1. Cards are generated from the exam board's own specification for "Describing motion along a line", and every card links back to the page it came from. Specification © AQA — used with attribution.
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Distance is a ? quantity because it does not involve direction.
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scalar
Define displacement.
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The distance moved in a straight line from start point to finish point, together with the direction of that line. It is a vector quantity.
What is a typical walking speed for a person?
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About 1.5 m/s.
What equation links distance travelled, speed and time for constant speed?
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distance travelled = speed × time, i.e. s = v t (s in m, v in m/s, t in s).
Define the velocity of an object.
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Its speed in a given direction. Velocity is a vector quantity.
Why does an object moving in a circle at constant speed have a changing velocity?
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Velocity is a vector; its direction is continually changing even though its magnitude (speed) stays the same.
What quantity is given by the gradient of a distance–time graph?
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Speed.
What is the equation for average acceleration?
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acceleration = change in velocity ÷ time taken, i.e. a = Δv / t (a in m/s², Δv in m/s, t in s).
What quantity does the area under a velocity–time graph represent?
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The distance travelled (or displacement) of the object.
What quantity is given by the gradient of a velocity–time graph?
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Acceleration.
State the equation for uniform acceleration linking final velocity, initial velocity, acceleration and distance.
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v² − u² = 2 a s
What is the resultant force on an object falling at terminal velocity?
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Zero — the drag from the fluid balances the weight, so the object no longer accelerates.
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