Understanding Lever Systems in GCSE PE

What are the three components of a lever system?

• Axis, load, and power

• Pivot, weight, and force

• Hinge, mass, and energy

• Fulcrum, resistance, and effort

What mnemonic is used to remember the central component of each class of lever system?

• REF213

• EFR321

• RFE312

• FRE123

What symbol is used to represent the fulcrum in a lever system diagram?

• Triangle

• Square

• Circle

• Arrow

Which class of lever system is described as having the fulcrum centrally located?

• None of the above

• Third-class

• First-class

• Second-class

Which example is associated with a first-class lever system?

• Tricep extension

• Calf raise

• Bicep curl

• Leg press

What is the mechanical advantage of a second-class lever system?

• The resistance arm is shorter than the effort arm

• The effort arm is shorter than the resistance arm

• Both arms are of equal length

• There is no mechanical advantage

Which muscle acts as the effort in a calf raise, a second-class lever system?

• Gastrocnemius

• Biceps

• Triceps

• Quadriceps

What distinguishes a third-class lever system from the others?

• The resistance is in the middle

• It has a mechanical disadvantage

• The fulcrum is at the end

• It has a mechanical advantage

In a bicep curl, what role does the bicep play?

• Resistance

• None of the above

• Effort

• Fulcrum

How does a third-class lever system's mechanical disadvantage manifest?

• There is no disadvantage

• Effort and output are equal

• Requires less effort for more output

• Requires more effort for less output