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| Questão | Responda |
| What is an effort? | An effort is force applied to a lever to overcome the load. |
| What is the load? | The load is a force that a lever is used to overcome. |
| What is a simple machine? | A simple machine is a device that makes work easier by changing the size or direction of a force. |
| What are the three different ways a simple machine can make a task easier? | It can: -Change the size of a force -Make things speed up -Change the direction of a force |
| What is a force multiplier? | A force multiplier is a machine that increases the force applied for a task, such as a first-class lever. |
| What are speed multipliers? | Speed multipliers are machines that requires a small movement of an effort to produce a large movement of a load, such as a third-class lever. |
| What is a lever? | A lever is a simple machine consisting of a rigid rod that pivots about a point. |
| What is fulcrum? | Fulcrum is a point about which a lever pivots. |
| The way a lever operates, depends on what? | The way a lever operates depends upon the position of the effort, load and fulcrum. |
| Levers can be grouped into what three types or classes of levers? | -First-class levers -Second-class levers -Third-class levers |
| What is a first-class lever? | A first-class lever is a lever with effort and loads located at each end, and fulcrum in the centre. |
| What are some examples of first-class levers? | Some examples of first-class levers are: -Pliers -Tin snips -Hedge cutters -Scissors |
| What is a second class lever? | A second class lever is a lever with the fulcrum located at one end, the effort at the other and load in the centre. |
| What are some examples of second-class levers? | Some examples of second-class levers are: -Bottle openers -Paper guillotines -Nutcrackers |
| What is a third-class lever? | A third-class lever is a lever with the fulcrum located at one end, with the load at the other and effort in the centre. |
| What are some examples of a third-class lever? | Some examples of a third-class lever are: -Tweezers -Tongs -Brooms |
| What is the mechanical advantage? | The mechanical advantage is the ratio of a load force to the effort force used by a machine. |
| What are some examples of speed multipliers? | Some examples of speed multipliers are baseball bats, cricket bats and golf clubs. |
| Where is the fulcrum positioned in a second-class lever? | A second-class lever has its fulcrum positioned at one end of the system and the effort at the other. |
| Where is the fulcrum positioned in a first-class lever? | A first-class lever has its fulcrum positioned between the effort and the load. |
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