Practical Examples and Demonstrations of Machines and Power - JSS2 Basic technology Lesson Note

Example 1: Using a Lever

• Activity: Use a seesaw or a crowbar to lift a heavy object.
• Explanation: This demonstrates how a lever can amplify an applied force to lift a heavy load with less effort.

Example 2: Inclined Plane

• Activity: Push a box up a ramp.
• Explanation: An inclined plane reduces the force needed to lift an object by increasing the distance over which the force is applied.

Example 3: Pulley System

• Activity: Use a pulley to lift a bucket of water from a well.
• Explanation: Pulleys change the direction of the applied force and can also multiply the force, making it easier to lift heavy objects.

Example 4: Bicycle (Complex Machine)

• Activity: Ride a bicycle.
• Explanation: A bicycle uses wheels and axles, gears (levers), and chains (pulleys) to convert human energy into motion efficiently.

Example 5: Power Calculation

• Activity: Calculate the power output of a student climbing stairs.
• Explanation: Measure the height of the stairs and the time taken to climb them. Use the formula ( P = W/t ), where ( W ) is the work done (force times distance) and ( t ) is the time taken, to determine the power output.