A roller coaster uses 800 000 J of energy to get to the top of the first hill. During this climb, it gains 500 000 J of potentia
l energy and pauses (velocity = 0) for a fraction of a second at the very top before heading down the other side. a) Draw a sankey diagram for a roller coaster's climb.
Odd though it seems at first, gravity is pulling the cat down while the floor is pushing the cat up - in equal amounts. Forces are absolutely acting on the cat but they balance - so there is no net force.
