The effort arm of a lever is $4 \mathrm{m}$ long and the load arm is $8 \mathrm{m}$ long. Find the effort required to lift a load of$20 \mathrm{N}$.

Solve the crossword puzzle using the hints given below:

Across:
2. A lever we use to eat food with
7. A wheel that turns freely on an axis
8. In a class 2 lever, this is at the centre
9. It is an example of a class 2 lever with a wheel

Down:
1. In class 3 lever, it is in between the fulcrum and load
2. It is a special type of inclined plane
3. It is a wedge
4. A complex machine
5. It is an example of a class 3 lever
6. It is a class 1 lever