A wheel and axle reduce friction and aid movement. To make a rubber band car, attach bottle caps as wheels to chopsticks, connect them to a frame and use a rubber band for propulsion.
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The wheel and axle system reduces friction, allowing smoother movement for loads. To make a rubber band car, create a frame using clothes clips. Attach bottle caps as wheels using chopsticks and glue. Secure a rubber band between the back wheels and frame for propulsion. Wind the rubber band and release it to power the car forward. This simple mechanism demonstrates the practical application of the wheel-and-axle principle.