Starter quiz
- Which lever component would be in the middle of a first class lever system?
- fulcrum ✓
- load
- effort
- lever
-
- Which shape represents the effort in a lever diagram?
- line
- triangle
- square
- arrow ✓
-
- Match the lever system to the correct combination.
- first class lever⇔LFE ✓
- second class lever⇔ELF ✓
- third class lever⇔FEL ✓
- Which of the following diagrams is correct for second class lever?
- Which of the following movements demonstrates a second class lever?
- A first class lever would be used in the movement of overhead ______ extension.
- 'triceps' ✓
Exit quiz
- Match the sporting action to the correct lever system.
- first class lever⇔overhead tricep extension. ✓
- second class lever⇔plantar flexion of the ankle. ✓
- third class lever⇔flexion of the elbow. ✓
Using football examples, match the sporting action to the correct lever system.- running towards the ball⇔second class lever. ✓
- throw in⇔first class lever. ✓
- striking the football with the laces.⇔third class lever. ✓
- Which of the following is correct for the effort in a third class lever?
- muscle origin
- muscle insertion ✓
- joint capsule
- ligaments
-
- Which of the following is correct description of the effort arm on a lever diagram?
- the distance from the fulcrum to the load.
- the distance from the load to the effort.
- the distance from the fulcrum to the effort. ✓
-
- Which is the correct calculation of mechanical advantage?
- effort arm divided by resistance arm ✓
- effort arm plus resistance arm
- effort arm multiplied by resistance arm
- effort arm subtracted from the resistance arm
-
- In a third class lever, the effort arm is shorter than the resistance arm and therefore at a ______ mechanical advantage.
- 'low' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Sporting examples of a first class lever include overhead tricep extension during a rugby line out.
- Sporting examples of a second class lever include plantar flexion at the ankle during a jump shot in basketball.
- Sporting examples of a third class lever include extension at the knee when kicking a football.
- A second lever system has a high mechanical advantage.
Common misconception
The effort in a lever starts in the belly of the muscle.
The effort from a muscle will start from the muscle insertion. The insertion is the tendon attached to the bone which that muscle moves.
Keywords
First class lever - fulcrum is placed in the middle bewteen the load and effort
Second class lever - load is placed in the middle bewteen the fulcrum and effort
Third class lever - effort is placed in the middle between the load and effort
Mechanical advantage - efficiency of a working lever- calculated by effort divided by resistance arm
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