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Roosevelt PS3
Simple machines
| Question | Answer |
|---|---|
| Mechanical advantage is ... | a force multiplier |
| What are the 3 ways machines make work easier? | gain force, gain distance, change direction of force |
| Ideal mechanical advantage does not include | friction |
| Machines cannot have an efficiency of over | 100%. |
| A machine that changes direction of a force has a MA of | one |
| A machine that gains force and sacrifices distance has a MA of | greater than one |
| A machine that sacrifices force but gains distance has a MA of | less than one |
| What is the label for mechanical advantage? | There is no label |
| The measure of how much work put into a machine turns in to useful work is | efficiency |
| The label for efficiency is | % |
| A first class lever can have a mechanical advantage of ... | >1, <1 or 1 |
| A second class lever has a mechanical advantage of | > 1 |
| A third class lever has a mechanical advantage of | <1 |
| True or False: Machines change the amount of work done. | False |
| By using an inclined plane, ______________ is gained and ________________ is sacrificed. | force is gained distance is sacrificed |
| The distance between the threads on a screw is called the | pitch |
| The __________ threads on a screw, the greater the mechanical advantage. | more |
| A wedge has a mechanical advantage of _______ because it causes a change in direction. | one |
| When using a screw you gain ______________ and sacrifice ______________. | gain force sacrifice distance |
| A mechanical advantage of one | changes direction |
| A mechanical advantage of greater than one | gains force |
| A mechanical advantage of less than one | gains distance |
| Wheels and axles gain _____________ and sacrifice ____________________ | gain force sacrifice distance |
| Efficiency is a comparison of ______________ and ___________________. | work output and work input |
| A door is an example of a _________ class lever. | second class |
| A wheelbarrow is an example of a __________ class lever. | second class |
| A pulley with a MA of >1 gains ______________ and sacrifices _____________. | force distance |
| A pulley with a MA = 1 changes ____________________. | direction |
| A first class lever has the ________________ in the middle. | fulcrum |
| A second class lever has the ______________ in the middle. | resistance |
| A third class lever has the _________________ in the middle. | effort |
| A crowbar is an example of a _______________ class lever. | first |
| A hockey stick is an example of a _______________ class lever. | third |
| Work is | the transfer of energy that makes an object move through a distance. |
| The work done by the person using the machine | work input |
| The work done by the machine | work output |
| The equation for work is | W = f x d (force x distance) |
| The unit for power is | watts |
| ___________ is the amount of time it takes for work to be done. | Power |
| What is the difference between AMA and IMA? | AMA includes friction IMA ignores friction |
| Mechanical advantage is a | force multiplier |
| If a machine has a MA >1 it gains | force |
| If a machine has a MA = 1 it _______________ and effort force and resistance force are ________________. | changes direction equal |
| If a machine has a MA <1 it gains | distance |
| An inclined plane has a MA gains ___________ and scarifies ___________ | force, distance |
| The (more or less) threads a screw has the greater the MA. | more |
| A machine can never be 100% efficient because of ________________. | friction |
| Efficiency = | work output/work input x 100% |
| The fulcrum is the ________________ point on the lever around which the lever pivots. | fixed |
| Anything you swing (like sports equipment) is a __________ class lever. | third |
| To find the MA of a pulley system you ____________ the number of _______ parts the system has, except the part you pull ________ on is never counted. | count rope down |
| A pulley is a | grooved wheel with a rope |
| A block and tackle is | a system of pulleys |
| A single fixed pulley has a MA of | 1 |
| A single fixed pulley ____________ ______________ of a force. It does not help __________ or ________________. | changes direction force, distance |
| A pulley with a MA > 1 gains ____________ and sacrifices ___________. | force distance |
| Gaining force means | you can do the same amount of work with less force (effort) |
| Sacrificing distance means | you have to go more distance to do the same amount of work |
| How much work is done on a heavy object that does not move when the force is applied? | no work is done (distance is zero) |
Created by:
JKSW2014
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