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| Pregunta | Respuesta |
| What does a simple machine can do? | change the size of a force. make things speed up. change the directions of a force. |
| How do you get a job done ? | You apply a force known as effort. |
| Load? | Is the force actually required to do a job. |
| What are force multipliers? | machine that increases the force applied for a task. |
| How to speed up things | You need to apply greater force to these type of machines (blade in eggbeater, gears in bicycle) but the machines speed things up |
| What are speed multipliers? | machine that requires a small movement of an effort to produce a large movement of a load. |
| Lever? | A lever is a simple machine that is made of a long rigid object (like a stick or metal rod). |
| What is a pivot or fulcrum? | Point about which lever rotates at |
| What does most levers do? | Increase the size of the effort that you can apply or reduce the effort needed, making the job easier |
| an example of the use of levers | using a hammer as a lever reduces the size of the effort needed to pull a nail from a piece of wood. |
| in the hammer and nail situation, which one is load and lever? | the claw of a hammer used as a lever to pull a nail, the load. |
| how many class can levers be grouped? | three; first class levers, second class levers and third class levers. |
| First-class levers. | the fulcrum is positioned between the effort and load. |
| first lever class | the greater the distance between the fulcrum and the effort, the greater the mechanical advantage. |
| mechanical advantage equation | |
| an example of first class levers | pliers, tin snips, hedge-cutters, scissors. |
| second lever classes | when the load is positioned between the fulcrum and the effort |
| an example of second class lever | a wheelbarrow. by lifting at the end with the handles a greater distance than the load is lifted. these levers also act as force multipliers |
| other examples | bottle openers, paper guillotines, and nutcrackers. |
| third class levers | when the effort is positioned between the fulcrum and load. |
| an example of third class levers | when using a broom, you apply a large effort force to the handle. the handle then moves though a much shorter distance than the other end of the broom, which moves faster, but with less force. |
| other examples | tweezers, tennis racquets, cricket bats. they're all speed multipliers as well. |
| what does scissors categorized as? | first class lever. |
| what does golf club categorized as? | third class lever. |
| what does wheelbarrow categorized as? | second class levers. |
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