3 Raft Pogo Zorb Roller coaster Glossary Index Credits 36 38 40 42 44 46 48 lever piston gravity Momentum Lots of different kinds of machines are used for sport Usually sport machines are designed for just one or two people to use We use machines for sport on land on the water and in the air Some are simple machines such as the blade of a skate Others such as a skidoo are more complicated but all our sport machines need energy and power The energy these machines use may be chemical energy from fossil fuels such as gasoline or human energy in our body It can be energy from the movement of air in sails or that produced in an engine Now let’s look at some of the machines that allow us to enjoy sport and the science that makes this possible
