Simple Machines
Simple machines such as levers, pulleys, ramps and gears make work easier by changing the size or direction of a force.
▶ Interact
Play with the controls to see the idea in action.
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Simple machines such as levers, pulleys, ramps and gears make work easier by changing the size or direction of a force.
- A machine can multiply force but not energy
- Pulleys change direction of the force
- A ramp reduces force by increasing distance
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Simple Machines?
Within Physics, which covers forces, energy, waves, electricity, magnetism, light and space explained through motion and experiments, this topic explains Simple Machines. Physics topics explain how things move, push, heat up and carry energy, so each one here pairs a definition with a live model you can change.
Check that you can explain Simple Machines in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Simple Machines explains how the physical world behaves, from sport and transport to electricity and medicine.
Simple Machines in detail
Simple machines such as levers, pulleys, inclined planes, wedges, screws and wheel-and-axle make tasks easier by changing the size or direction of a force. They do not reduce the work needed; instead a smaller force acts over a greater distance.
The mechanical advantage is load ÷ effort, and the efficiency is lower than 100% because of friction. A ramp reduces the force to lift a load, and a pulley system with several ropes divides the effort. Understanding these devices helps explain tools such as spanners, cranes and jacks.
How the interactive helps you understand Simple Machines
Watch the lever in the interactive. Use any sliders or buttons it offers to change the values and see how the lever responds.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Simple Machines.
Real-life uses and examples
- Answer “explain” questions by linking Simple Machines to a clear cause and effect.
- Predict what a ball, car or circuit will do with Simple Machines before you do the calculation.
- Explain everyday devices, such as brakes, lifts or chargers, using Simple Machines.
Common mistakes to avoid
- Forgetting that some quantities, such as force or velocity, also have a direction.
- Mixing up Simple Machines with a related quantity that has different units.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Simple Machines
What is Simple Machines?
Simple machines such as levers, pulleys, ramps and gears make work easier by changing the size or direction of a force.
What are the most important points about Simple Machines?
The main points are: A machine can multiply force but not energy; Pulleys change direction of the force; A ramp reduces force by increasing distance.
Why is Simple Machines useful?
Understanding Simple Machines explains how the physical world behaves, from sport and transport to electricity and medicine.
How can I practise Simple Machines?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to Simple Machines?
Related topics in Physics include Impulse and Collisions, Kinetic Theory of Matter, Specific Heat Capacity.