1. What is a lever?
A lever is a simple machine that consists of a rigid bar or beam that is supported at one point and used to transmit or amplify force.
2. What are the three classes of levers?
The three classes of levers are:
- First-class lever: the fulcrum is located between the effort force and the load
- Second-class lever: the load is located between the fulcrum and the effort force
- Third-class lever: the effort force is located between the fulcrum and the load
3. Give an example of a first-class lever.
A seesaw is an example of a first-class lever, where the fulcrum is located in the center and the effort force of one person sitting on one end is used to lift the load of a person sitting on the other end.
4. Give an example of a second-class lever.
A wheelbarrow is an example of a second-class lever, where the load is placed in the tray between the fulcrum (wheel) and the effort force (the person pushing the handles).
5. Give an example of a third-class lever.
A shovel is an example of a third-class lever, where the effort force applied by the person holding the handle is used to lift the load (dirt or debris) at the opposite end.
Levers quick check answers
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