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Linear and Angular Motion

Distance, displacement, speed and velocity

  • 3 things to know
  • Components 1 and 2

Overview

Distance and displacement, speed and velocity, position, worked speed and 400 m lap examples, linear motion, distance–time graphs and split times.

What you need to know

Answer each one before you reveal it.

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Key term

How do distance and displacement differ, and how do speed and velocity differ?

Key term

What is the difference between distance and displacement?

Key term

What is the difference between speed and velocity?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the difference between distance and displacement?

    Model answer

    Distance is the total length of the path covered. Displacement is the shortest straight-line change in position, in a stated direction.

  2. 2

    What is the difference between speed and velocity?

    Model answer

    Speed is the rate of covering distance and has size only. Velocity is the rate of change of displacement and has size and direction.

  3. 3

    What is position in linear motion?

    Model answer

    Position is where a body is located relative to a fixed point. Changes in position are used to calculate displacement.

  4. 4

    A sprinter runs 100 m in 12.5 s. What is the average speed?

    Model answer

    The average speed is 8 m s⁻¹. The working is 100 m ÷ 12.5 s = 8 m s⁻¹.

  5. 5

    A runner completes one 400 m lap and finishes at the start. What are the distance and displacement?

    Model answer

    The distance is 400 m. The displacement is zero, because the runner finishes where they started.

  6. 6

    Why is the runner's average velocity zero after one full lap?

    Model answer

    Average velocity is displacement divided by time. The displacement is zero, so the average velocity is zero.

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