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- pivot between load and effort
- effort is further away from the pivot than the load so that the effort is smaller than the load
- the movement of the load is in the opposite direction of the effort
- SEESAW, CATAPULT, SCISSORS, PLIERS
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- load is between fulcrum and effort
- movement of load is in the same direction as the effort
- This is a force-multiplying lever
CROWBAR, WHEELBARROW, NUTCRACKER
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- Effort between load and fulcrum
- load and effort move in the same direction
- This is a distance-multiplying lever
TWEEZERS, STAPLER, MOUSE TRAP
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What is a lever?
A lever is a simple machine that allows you to gain mechanical advantage in moving or applying force to an object. It is a useful machine because friction is not a factor to overcome, which it can be in other machines.
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3 parts of a lever are…
- The effort- the force which moves the lever
- the load- the object the lever is trying to apply force to/ move
- the pivot/fulcrum- the point where the lever moves
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The principle of moments can be used to calculate the force of the effort.
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LARGE LOAD X SMALL DISTANCE = SMALL EFFORT X LARGE DISTANCE
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