All the
machines we use need energy to function: a television needs electricity, a car
needs petrol, a sailing boat needs wind, a bike needs a person to push the
pedals.
Throughout
history, people have tried to invent a machine that, once it was started, would
not need more energy to keep functioning. This type of machine is called a
perpetual motion machine.
Many people
have tried to achieve fame by inventing a perpetual motion machine. However,
all their machines eventually stopped because the energy ran out. If these
inventions had worked, they would have changed the course of history.
No comments:
Post a Comment