How are stored mechanical energy and motion energy related?
What to use
This is what might be called a 'thought experiment' but you may need the following to test your ideas.
Rubber band, brick, tennis or cricket ball.
What to do
Stretch a rubber band.
What type of mechanical energy does it have while it is stretched?
Hold a brick 30 cm above the ground.
What type of mechanical energy does it have?
If you lifted it to 60 cm above the ground, would it have a greater or a lesser amount of mechanical energy?
How could you demonstrate that the brick had more mechanical energy at the greater height?
A cricket ball and a tennis ball are rolled across the bench at the same speed. How could you demonstrate that the cricket ball had more motion energy than the tennis ball?
