Exam Science Law Of Levers Junior6 Part2

The force x its arm = The resistance x its arm.

The resistance arm is the distance between the resistance force and fulcrum.

When the force arm is equal to the resistance arm, the lever conserves effort.

When the resistance arm is longer than the effort arm, the lever saves effort.

When the resistance arm is shorter than the effort arm, the lever doesn’t conserve effort.

If the arm of force is shorter than the arm of resistance, the lever conserves effort.

The effort force is measured in cm or meter.

The length of the force arm and the length of the resistance arm determine the value of effort force and resistance force.

The resistance arm is measured in meter.

In the second class levers, the effort arm is always longer than the resistance arm.

The resistance force is larger than the effort force in the third class levers.

Some of the first class levers conserve effort while the others don’t .

In the wheelbarrow, the resistance arm is shorter than the effort arm.

In the 3rd levers, the arm of force may be equal to the arm of resistance .

Hockey bat and tweezers have a mechanical benefit.

Manual broom and ice holder don’t conserve effort.

In nutcracker, the effort arm is shorter than the resistance arm.

In soda water opener, the resistance force is smaller than the effort force.

The third class levers always save effort.