# LEVERS

A machine is a simple object which makes our work easier to do. Many objects in the school and at home such as a pair of scissors, bottle opener and cutlass, are examples of simple machines. In science, anything that makes us to use less energy to do much work or overcome a large force is called a machine.

Examples of simplest machines are the levers and pulleys.

## MEANING OF LEVER

A lever is a simple machine that has the point of motion where effort can be made to carry a load.

## EXAMPLES OF LEVER

1. Seesaw
2. Scissor
3. Crowbar
4. Hammer
5. Nut cracker
6. Pliers
7. Hockey stick
8. Wheel barrow
9. Door handle
10. Dolly
11. Hole puncher

SAFETY AND ACCIDENTS

Water and Chemical Pollution

Air and Noise Pollution

## PARTS OF LEVER

The three most important parts of a lever are:

2. Effort
3. Fulcrum or Pivot.

## USES OF LEVER

1. Seesaw is used to have fun with a friend;
2. Scissor is used for cutting;
3. Crowbar used for split something apart or take out nails;
4. Hockey stick used to play hockey;
5. Wheel barrow is used move dirt or anything else;
6. Door handle is used to get through a door;
7. Dolly it is used to move heavy boxes and freight;
8. Hole puncher it is you for making hole on belt; etc.

## Strategies & Activities

Step: Teacher revises the previous topic

Step 2: Teacher introduces the new topic.

Step3: Teacher endeavors to explain all the points to the pupils thoroughly.

Step 4: Teacher welcomes pupils’ questions.

Step 5: Teacher evaluates the pupils.

## Assessment& Evaluation

. Name five common levers and machines in their homes;

1. Locate the pivot (fulcrum) load and effort arms in common lever machines;
2. State five common uses of levers.