Wheels and Ramps
Explore how wheels and ramps reduce friction and make moving easier.
Wheels and ramps are simple machines that help things move.
- Explain how wheels help movement.
- Explain what a ramp is.
- Compare pushing a load with and without wheels.
Wheels
A wheel is a round object that turns on an axle. Wheels reduce friction, so a cart rolls more easily than a heavy box slides. Bicycles, cars and suitcases all use wheels.
Ramps
A ramp is a sloping surface, also called an inclined plane. It lets you push or roll a load up gradually instead of lifting it straight up. Loading a wheelbarrow onto a lorry is easier with a ramp.
Push a heavy book across the floor. Feel the friction.
Put the book on a toy with wheels and push it again. Is it easier?
Try rolling a ball up a gentle ramp and a steep ramp. Which is easier?
Practice
- Name three things that use wheels.
- What is another name for a ramp?
- Draw a ramp helping someone load a wheelbarrow onto a truck.
Recap
Wheels reduce friction and ramps let us raise loads gradually. Both make work easier.
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Simple Machines
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