Simple Machines
Physics · 50 practice questions
Definition and types of simple machines; mechanical advantage, velocity ratio and efficiency of machines.
- Identify different types of simple machines and solve problems involving mechanical advantage, velocity ratio and efficiency.
Try a few questions
- Practice question 1
An inclined plane is a simple machine that allows a load to be raised using
- A.more effort applied over a shorter distance
- B.less effort applied over a longer distance
- C.exactly the same effort as lifting it vertically
- D.no effort at all, regardless of the load
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B. less effort applied over a longer distance
Spreading the lift over a longer sloped distance reduces the effort force needed at any one moment.
- Practice question 2
A compound machine's overall mechanical advantage, made of two or more simple machines linked together, is generally
- A.the sum of the mechanical advantages of its individual component machines
- B.the product of the mechanical advantages of its individual component machines
- C.always equal to exactly 1, regardless of its individual components
- D.completely unrelated to the mechanical advantages of its components
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B. the product of the mechanical advantages of its individual component machines
Multiplying together each component's individual mechanical advantage gives the overall advantage of the compound machine.
- Practice question 3
The velocity ratio of a simple machine is mainly calculated as the
- A.load divided by the effort
- B.distance moved by the load divided by the distance moved by the effort
- C.distance moved by the effort divided by the distance moved by the load
- D.effort divided by the distance moved by the load
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C. distance moved by the effort divided by the distance moved by the load
Velocity ratio compares how far the effort travels to how far the load actually moves.
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