Given below is a crossword puzzle based on this lesson. Read the clues across and clues downwards and fill up the blank squares.

Across:

1. It makes work easier …………… .
2. A …………… is a simple machine which is used for raising a load up by applying the effort downwards.
3. Work is said to be done when a …………… applied on a body moves it.

Down:

2. …………… force at the fulcrum reduces the mechanical advantage.
3. A …………… and axle is also a simple machine.
4. Screw driver is an example of wheel and …………… .
5. …………… is a rod which can turn about a fixed point (fulcrum)

In a machine an effort of 10 kgf is applied to lift a load of 100 kgf. What is its mechanical advantage?

The mechanical advantage of a machine is 2. It is used to raise a load of 15 kgf. What effort is needed?

A lever of length 100 cm has effort of 15 kgf at a distance of 40 cm from the fulcrum at one end. What load can be applied at its other end?