Definition of a lever and the three different classes, and how each one changes force.
Shows how a skateboard relates to simple machines.
Reviews the definition of a lever, the three classes of levers, and how each class of lever changes force.
Discover how an amazing structure in Florida, called Coral Castle, was built by a single person using only simple machines.
Learn about a wheelchair with levers that can travel over rough terrain and potentially help millions of people around the world.
Find out how muscles and bones in the human body work together as simple machines called levers.
A series of animations that display the different types of levers and what they are useful for.