This is a Water Wheel Working Model. When water is poured over the bottle cap paddles, it rotates the wheel using kinetic energy of flowing water.

This concept is used in hydroelectric power plants where water spins turbines to generate electricity. The model demonstrates conversion of water energy into mechanical energy.
Materials Needed
- 1 plastic bottle (for base and water source)
- 6–8 bottle caps (to make paddles of the wheel)
- 1 straw pipe (as the axle)
- 2 circular cardboard discs (for sides of the wheel)
- Cardboard (for stand)
- Glue gun or strong tape
- Scissors or cutter
- Optional: a small paper cup (to pour water)
How to Make Water Wheel Working Model
Step 1: Make the Water Wheel
- Cut 2 cardboard circles (~6–8 cm diameter).
- Stick them parallel to each other with a straw pipe in between as the axle.
- Glue bottle caps (flat side inward) equally spaced around the edge between the two discs. These act as blades or paddles to catch the water.
Step 2: Create a Stand
- Use cardboard to build a stand to hold the water wheel above the ground and allow free rotation.
- Make two vertical supports with holes to let the straw axle go through and spin freely.
Step 3: Add the Water Source
- Take a plastic bottle with a small hole (like a tap) or use a paper/plastic cup with a hole to act as a water pourer.
- Fix the water source above the wheel so water can fall on the caps from a height.
Step 4: Test It
- Pour water through the plastic bottle or cup.
- As water hits the bottle caps, the wheel should start spinning due to the force of falling water.