Levers Flashcards
what is a lever system
a lever system enables movement within the body. They explain how our muscles bones and joints work together to produce different forces to move objects including oursleves.
what are the 3 types of levers
- 1st class
- 2 class
- 3 class
what is the fulcrum
the joint e.g. the elbow
what is the effort
the agonist (the muscle that is causing the movement
what is the load/resistance
the weight that you are tyring to move
explain a second class lever system
- has the mechanical advantage to move a large load with a small effort.
- only found at the ankle joint in the body.
explain a third class lever system
- greater distance between the load and the fulcrum, thus meaning it can generate and faster velocity and acceleration, due to having to travel further.
where is the only second class lever in the body found
in the foot (ankle joint)
what is the equation for mechanical advantage
mechanical advantage = effort arm/resistance arm
What are the three components of a lever system?
Effort, load, and fulcrum.
True or False: A first-class lever has the fulcrum located between the effort and the load.
True.
Fill in the blank: In a second-class lever, the load is positioned ______ the fulcrum and effort.
between.
What type of lever is a seesaw an example of?
First-class lever.
Which type of lever allows for the greatest mechanical advantage?
Second-class lever.
In a third-class lever, where is the effort applied?
Between the fulcrum and the load.
What is the main advantage of third-class levers?
They allow for a greater range of motion and speed.
Multiple Choice: Which of the following is NOT a type of lever? A) First-class B) Second-class C) Third-class D) Fourth-class
D) Fourth-class.
What is the role of the fulcrum in a lever system?
It acts as the pivot point around which the lever rotates.
Fill in the blank: The ______ is the force applied to move the load in a lever system.
effort.
Short Answer: Name an example of a second-class lever in the human body.
The calf raising the body on the toes.
Multiple Choice: Which lever type is most commonly used in fitness and sports? A) First-class B) Second-class C) Third-class
C) Third-class.
Fill in the blank: The point where the lever pivots is known as the ______.
fulcrum.
Short Answer: Describe the difference between a first-class and a second-class lever.
In a first-class lever, the fulcrum is between the effort and load; in a second-class lever, the load is between the effort and fulcrum.
What is the significance of lever systems in physical education?
They help understand movement mechanics and enhance performance.
True or False: In a second-class lever, the effort arm is always longer than the load arm.
True.
Fill in the blank: The ______ arm is the distance from the fulcrum to the point where the effort is applied.
effort.
Short Answer: Explain how levers can be used to improve athletic performance.
By optimizing lever systems, athletes can enhance force production and efficiency in movements.
Multiple Choice: Which of the following is a characteristic of a first-class lever? A) Load is in the middle B) Effort is in the middle C) Fulcrum is in the middle
C) Fulcrum is in the middle.
True or False: The human leg acts as a first-class lever during a squat.
False.
