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| Questão | Responda |
| what force is needed to get a job done? | 'effort' |
| what is a load | the force that a lever is used to overcome |
| what is a fulcrum | the point about which a lever points |
| lever | simple machine consisting of a rigid rod that pivots about a point |
| first class lever | lever with effort and loads at each end and fulcrum in the centre |
| mechanical advantage | ratio of a load force to the effort force used by a machine |
| what do machines do | they make tasks easier |
| which tasks do machines make easier | changing the size of thing, making things speed up, changing the direction of a force. |
| how does a machine help us lift a car | with a jack, it lifts up the car. |
| what is a speed multiplier | machine that requires a small movement of an effort to produce a large movement of a load. |
| what is a second class lever | lever with the flucrum located at one end the effort |
| how does a machine change the direction of a force | you pull the cable down and a pulley changes the direction |
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