Conduct simple experiments about machines

What You Need

• A ruler or long stick
• A pencil (to act as the fulcrum)
• A small stone or eraser (as the load)
• Your hand (to apply effort)

Steps

1. Place the ruler on top of the pencil so the pencil is in the middle. The pencil is the fulcrum (pivot point).
2. Place the stone on one end of the ruler.
3. Push down on the other end of the ruler. This is your effort.
4. Observe how the stone lifts up. This is the load.
5. Move the pencil closer to the stone and try again. What happens?
6. Move the pencil away from the stone and try again. What happens?

What You Will Notice

When the fulcrum is closer to the load, it becomes easier to lift the stone, but you must push down a longer distance. When the fulcrum is in the middle, the lever is balanced. This shows how levers make work easier by changing the amount of force needed.

What You Need

• A flat board or cardboard
• Some books to raise one end
• A small toy car or a ball
• A ruler to measure

Steps

1. Place one end of the board on the books to make a ramp (inclined plane).
2. Measure the height of the ramp from the ground.
3. Roll the car or ball up the ramp and observe how hard it is to push.
4. Now make the ramp steeper by adding more books.
5. Try pushing the car up again. Is it harder or easier?

What You Will Notice

A steeper ramp requires more effort to push the object up. A longer, less steep ramp requires less effort but you have to push the object over a longer distance. This is why ramps are used in markets and bus stands in Tanzania — they help move heavy goods easily.

What You Need

• A knife or a wooden wedge
• A piece of soft wood or clay
• A hammer (optional)

Steps

1. Try to push the thin edge of a knife into the wood or clay.
2. Notice how the narrow edge goes in more easily than the thick back of the knife.
3. If you have a wooden wedge, place it in a crack in the wood and tap it gently with a hammer.
4. Observe how the wedge splits the wood apart.

What You Will Notice

A wedge concentrates a large force onto a small point, making it easier to cut or split things. This is why axes, knives, and scissors all have sharp edges.

When you do experiments about machines, follow these steps:

1. Identify the problem – What are you testing? (For example: Does moving the fulcrum change how easy it is to lift?)
2. Gather materials – Collect simple things from around your home or school.
3. Make a prediction – Guess what will happen before you start.
4. Carry out the experiment – Follow the steps carefully.
5. Observe and record – Write down what you see, hear, or feel.
6. Draw a conclusion – Explain what the experiment showed you about simple machines.

Always be careful when using sharp objects like knives or when working with heavy objects. Ask your teacher or an adult for help when needed.

In Tanzania, simple machines are used everywhere in daily life. When traders at a market load sacks of maize or beans onto a truck, they often use a ramp (inclined plane) to roll the sacks up instead of lifting them straight up — this saves energy and prevents injury. Farmers use wheelbarrows (which are levers) to carry heavy loads from one place to another. Understanding how these machines work helps you use them safely and effectively, and you can even build your own simple machines at home using wood and string.