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Speed | Physics for Grade 10 PDF Download

Introduction

  • The speed of an object is the distance it travels every second
  • Speed is a scalar quantity
    • This is because it only contains a magnitude (without a direction)
  • The average speed of an object is given by the equation:
    Speed | Physics for Grade 10
  • Distance is measured in metres, m
  • Time is measured in seconds, s
    • Speed is therefore measured in metres per second, m/s
      A hiker might have an average speed of 2.0 m/s, whereas a particularly excited bumble bee can have average speeds of up to 4.5 m/s
      A hiker might have an average speed of 2.0 m/s, whereas a particularly excited bumble bee can have average speeds of up to 4.5 m/s

Exam Tip


Remember that average speed is the mean speed of the moving object.Its speed at a specific moment could be higher or lower - so because the speed changes you need to consider the total distance and time taken.

Non-Uniform Motion

  • The speed of an object is rarely constant
    • Hikers change their pace continuously as they walk
    • Bumblebees buzz around in all directions with varying speed
    • Cars are constantly speeding up and slowing down throughout a journey
  • Non-uniform motion refers to motion that is changing
  • Changing motion can mean the object is changing its speed, direction or both
    Race drivers know all about non-uniform motion, especially slowing down for corners and speeding up on the straight sections of track
    Race drivers know all about non-uniform motion, especially slowing down for corners and speeding up on the straight sections of track
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