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Terms in this set (29)
A type of simple machine
Lever Arm, The Bar
The fixed point that the pivot is attached to
The mass lifted
Push or Pull
Amount of force needed to lift a load
Metric unit of force
As the distance between the spring scale and the fulcrum increases, the effort force needed to balance the lever...
Tells you how many times easier your job (work) is when you use a lever.
How to find the Mechanical Advantage
MA = EA ÷ RA
EA (distance Effort is from fulcrum)
RA (distance load or resistance is from fulcrum)
As the effort arm increases, the mechanical advantage for lifting a load
The greater the mechanical advantage, the .... it is to lift a load.
For First Class Levers, when the MA of a lever is less than 1
there is no effort advantage, but there is the advantage of height, if you can manage to lift the load!
For First Class Levers, When the MA of a lever is equal to 1
the lever is balanced
For First Class Levers, When the MA is greater than 1
less effort is needed to lift the load
Why is a wheel and axle sometimes called a "lever in the round"?
Because when there is an actual wheel it moves in a circle. The fulcrum is in the middle.
What is the difference between a 1st class lever, a 2nd class lever and a 3rd class lever?
The first class has the fulcrum in the middle, second class load in the middle, third class effort in the middle
Class 1 Advantages
You use less effort
Class 1 Disadvantages
Can't lift as high when you move it farther away from the fulcrum
Class 2 Advantages
Take less effort you lift a heavy load. Effort is exerted over a larger distance than the load is lifted.
Class 2 Disadvantages
Class 3 Advantages
Far from the lever, which gives you an advantages
Class 3 Disadvantages
What is an inclined plane?
A slope or a ramp
How does an inclined plane help you when you are lifting a load?
You can push it higher up with having to pick it up
Which device uses a lever?
a) a seesaw
b)a pair of tweezers
c) a wheelbarrow
d) all of the above
How is a 3rd class lever different from a 1st class and 2nd class lever?
a) A class 3 lever makes the job easier, but decreases the movement of the load.
b) a class 3 lever makes the job easier, but increases the movement of the load.
c) a class 3 lever makes the job harder, but increases the movement of the load.
d) a class 3 lever makes the job harder, but decreases the movement of the load.
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