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# Roosevelt PS3

### Simple machines

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