Aims

• The concept of motion as change of position, this always takes time.
• Introduce velocity as rate of change of displacement
• Understand the difference between velocity and speed.
• The difference between average velocity and instantaneous velocity.
• calculate velocity from v=s/t
• The meaning of relative.
• Calculate relative velocities

TOK

• The use of language velocity and speed, ask students if other languages make a distinction.
• The way we break problems down into simple components e.g considering small steps that are constant velocity.
• What else is relative?

Notes

I'm not sure if its really worth introducing relative velocity at this stage since students find it confusing. The difference between instantaneous and average velocity can also be a sticking point

Its important to reassure students that the examples of motion along curved paths are far to complex and we are only going to consider simple 1 Dimensional examples

Tests

Distance, displacement and speed

Distance, displacement and speed answers

Speed and velocity mc test

Velocity and speed problems

Text Book

Page17-19

Homework

Problems 1 and 2

Vocabulary list

Velocity
Speed, faster, slower
Instant, Instantaneous
Relative
Average
Downstream
Swept
1 Dimension

The velocity of a body increases as it is swept downstream.