State three differences between three classes of levers.

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Solution

Class I Class II Class III

Fulcrum is between load and effort. Load is between
fulcrum and effort. Effort is between
fulcrum and load.

The effort arm can be
shorter, equal to or longer than the load
arm. The effort
arm is always longer than the load arm. The effort arm
is always
shorter than the load arm.

Mechanical
advantage can be less than, equal to or greater
than 1. Mechanical
advantage is always greater
than 1. Mechanical
advantage is always less than 1.

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Class I	Class II	Class III
Fulcrum is between load and effort.	Load is between fulcrum and effort.	Effort is between fulcrum and load.
The effort arm can be shorter, equal to or longer than the load arm.	The effort arm is always longer than the load arm.	The effort arm is always shorter than the load arm.
Mechanical advantage can be less than, equal to or greater than 1.	Mechanical advantage is always greater than 1.	Mechanical advantage is always less than 1.