1.3 Test Your Idea
At this point you may have concluded that,
“Different observers see the same motion differently”.
Another way of saying this is that,
“Motion is relative”.
Consider the following experiment:
Your friend carries an object and
walks in a westerly direction.
a) Based on what you know about relative motion,
what you would need to do
to make the object appear stationary (not moving). Write your prediction and explain
b) Use the idea of relativ
e motion to
what you need to do to see the object as
moving in the easterly direction. Write your prediction and explain it.
c) Perform the experiment.
d) Make a judgment about whether the idea that motion is relative was supported or
disproved by your experiment. Explain.