Simplify the following text for a Grade 8 native English-speaking person.
Original: The force applied ( at end points of the lever ) is proportional to the ratio of the length of the lever arm measured between the fulcrum ( pivoting point ) and application point of the force applied at each end of the lever .
Simplified: A first-class lever is a lever where the fulcrum is in between the effort and resistance ( the load ) .