Lesson Plan: 3P.3.06

Hamble Lesson Observation Plan
Learning About
What do we mean by relative motion?
Keywords:
  • Speed (4)
  • Relative (2)
  • Velocity: The speed in a known direction. (1)
  • Relative: With reference to a different point or body which may or may not be stationary. (1)
Memory Anchor:
Method Precise Learning Objective Linked Question / Activity
(Designed for maximum working out)
Stepping Stones Pitstop Check
(Thinking Map)
W What is the difference in speed between a car travelling a 30 m/s and a lorry travelling at 20 m/s? => 10 m/s How did you work this out? => 30 take away 20 This is the relative motion between the car and the lorry. What is the difference in speed between a car travelling a 30 m/s and a lorry travelling at 20 m/s? How did you work this out? What does this difference in speed show?

T The relative motion is the 'motion' (movement) of one object measured 'relative' (from) another. What is meant by 'relative motion'?

T How much further does the car get away from the lorry in one second? => 10 m/s What if the car starts behind the lorry? => The car would get closer, maybe collided at 10 m/s. How much further does the car get away from the lorry in one second? What if the car starts behind the lorry?

W At what speed would they collide at if they were travelling towards each other? => 50 m/s How did you work this out? => 30 plus 20 At what speed would they collide at if they were travelling towards each other? How did you work this out?

T Velocity is speed in a direction. A negative velocity is in the opposite direction to a positive one. What is velocity? What is negative velocity?

W If the lorry is travelling at 20 m/s and a car at -30 m/s what speed do they collide at? => 50 m/s How did you work this out? => 20 take away minus 30 If the lorry is travelling at 20 m/s and a car at -30 m/s what speed do they collide at? How did you work this out?

A Answer question on relative motion eg: trains and cars passing one another

Links To the Big Ideas
ForcesParticlesEnergyCells