Describing MotionEdexcel GCSE Physics: Flashcards

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What is the difference between a scalar and a vector quantity?

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What is the difference between a scalar and a vector quantity?: A scalar has magnitude only; a vector has both magnitude and direction.
Give three examples of vector quantities.: Any three of: displacement, velocity, acceleration, force, weight, momentum.
Give three examples of scalar quantities.: Any three of: distance, speed, mass, energy, time.
Define velocity.: Speed in a stated direction.
State the equation linking average speed, distance and time.: Average speed (m/s) = distance (m) divided by time (s).
What does the gradient of a distance-time graph represent?: The speed of the object.
State the equation for acceleration.: a = (v − u) / t, where v is final velocity, u is initial velocity, t is time.
State the equation linking v, u, a and x without time.: v squared minus u squared = 2 × a × x.
What does the gradient of a velocity-time graph represent?: The acceleration of the object.
How do you find distance travelled from a velocity-time graph?: Calculate the area between the line and the time axis.
What device can be used with a timer to measure the speed of an object in a lab?: A light gate.
What is the value of g for free fall near the Earth's surface?: g = 10 m/s².
What does a horizontal line on a velocity-time graph indicate?: Constant velocity (zero acceleration).
What does a negative gradient on a velocity-time graph indicate?: Deceleration (velocity decreasing).
Give a typical walking speed in m/s.: About 1.5 m/s.