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History of the Lever Theory of Operation Classes of Levers Examples of Levers Other
100
What is... 1500 B.C.
One of the first recorded uses of the lever was in ___________
100
What is... Theory of Operation
The formula for correctly using the lever is called the __________________________.
100
What is... third
In the ________ class lever, the force you have to use is greater than the load that is there, but the effort is a shorter distance than the load’s distance.
100
What is... hand brakes
One example of a first class lever is bicycle ________________
100
What is... 100 tons
Some of the objects lifted in ancient times weighed over ______________
200
What is... steelyard
The Greek device, the _____________, improved on these levers by adding a sliding weight to the other side to enhance the precision.
200
What is... opposite
If the weight is one meter from the fulcrum, you have to apply force two meters from the fulcrum in the ____________ direction.
200
What is... first
The __________ class lever is when the fulcrum is somewhere in between the load, or object, and the effort, or applied force.
200
What is... canoe
One example of a second class lever is a _______ paddle
200
What is... less
The lever allows the person using it to use _____ force to move an object
300
Who is... Archimedes
The earliest recording of the lever being used was in the third century B.C. and these were provided by __________________.
300
What is... right next to or close to
To maximize the applied effort people found that placing the fulcrum ____________________ the load was more efficient than any other position on the lever.
300
What is... second
In the _________ class lever, the fulcrum is totally to one side, the load is in the middle, and the effort is on the other side.
300
What is... fishing
One example of a third class lever is a _______ rod
300
Who is... Kyle, Josh, and Sarai
Who made this powerpoint?
400
What is... to raise
The word lever, comes from the French, meaning ______________.
400
What is... twice
To correctly lift what you want to, you have to apply force ___________ the distance between the weight and the fulcrum.
400
What is... first
The most common type of lever used is the ________ class lever
400
What is... diving
One example of a second class lever is a _________ board
400
What is... second
The stapler is a ________ class lever
500
What is... excavation, cultivation, and for moving large objects
Levers have been used since ancient times for _________________, _____________, and ___________________.
500
What is... fulcrum, load, and effort
A lever is a simple machine, but can be difficult to use if you do not know the correct positions for the
____________, ______________, and __________________
500
What is... third
The _______ class lever is the most common lever in the human body
500
What is... arm
One example of a third class lever is a human __________
500
Answers vary
Name 2 examples of levers in this room.




Levers

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