Lever Systems Flashcards
The lever is the
Bone
The fulcrum Is the
joint
The effort is the
Force provided - muscles
The load is the
Weight of the body of object being held
The fulcrum is represented as a
Shape
Triangle
The effort is represented as a
Shape
Arrow - pointing in direction that effort is applied
The load is represented by a
Shape
Square
The lever is represented as a
Shape
Line
Describe the first lever
Fulcrum is between the load and the effort
Describe the second class lever
The load is between the effort and the fulcrum
Describe the third class lever
The effort is between the fulcrum and the load
An example of a first class lever
Extending the arm at the elbow for a chest push in netball The effort is the tricep The load is the ball The fulcrum is the elbow joint (hinge) The lever is the humerus, ulna
An example of a second class lever
During calf raises or a jump
Ball of the foot is the fulcrum
Effort is gastrocnemius
The load is the weight of the body
An example of a third class lever
Bicep curl
Fulcrum is elbow joint (hinge)
Load is the weight
Effort is the bicep
Most common lever system for sport
Third class lever
Two functions of levers
Mechanical advantage
Move load faster and further
Move a heavier load
Calculation to work out mechanical advantage
Output force divided by input force
What lever are mechanical advantages
First and second class levers
Plantar flexion is linked to what class lever
Second
Define mechanical disadvantage
Input of the lever is greater than the output
You are putting in more effort than you get out
What lever is mechanical disadvantage
Third class lever
Advantages and disadvantages of a third class lever
ππ»
Speed and a wide range of movements
ππ»
Greater force required to move the load
Advantages and disadvantages to first class levers
ππ» stable and strong
ππ» slow and limited flexibility
Advantages and disadvantages of a second class lever
ππ» force given allows heavy loads to be lifted
ππ» small range of movements and canβt move quickly
Identify lever system when kicking a ball at the knee
Third class lever system
Explain mechanical disadvantage of the lever system at the ball of the foot in a sprint start
A second class lever operates the ball is the foot
Which means it cannot lift the load of the body at a high speed
Making it hard to get a fast start
Reason why for second class levers advantages and disadvantages
Due to the load being closer to the fulcrum than the effort
Reason why for third class levers advantages and disadvantages
Due to the effort being closer to fulcrum than the load