OUTCOME
By the end of this lesson you will be able to describe and apply the principles of Galilean relativity to problems. You will be able to describe frames of reference.
The laws of physics do not depend on the velocity of the observer. An external reference is needed to determine velocity of an object.
Frames of reference are needed to describe motion because velocity if relative to the motion of the observer.
Is this the answer to time travel? Can you identify what is the fixed value in this?
LEARNING TASKS
Explain
1. Explain what is meant by the term relative?
2. Why is velocity relative? Use an example to explain
3. Show with vectors that
Velocity (B rel to A) = VB - V A
4. What is a reference frame?
Explore and Elaborate
Evaluate
Try questions Qs 1-9