Soc 20: Levers Flashcards
What is a lever?
A lever is a rigid bar that rotates around a fixed point called the fulcrum.
Name the three classes of levers.
First class, second class, and third class levers.
In a first class lever, where is the fulcrum located?
The fulcrum is located between the effort and the load.
True or False: In a second class lever, the load is between the fulcrum and the effort.
True.
Fill in the blank: In a third class lever, the effort is applied ______ the load.
closer to.
Give an example of a first class lever.
A seesaw.
What is the mechanical advantage of a lever?
The ratio of the load force to the effort force.
True or False: A first class lever can have a mechanical advantage greater than 1.
True.
What type of lever is a wheelbarrow?
A second class lever.
Which lever class is most commonly found in the human body?
Third class levers.
Identify one advantage of third class levers.
They allow for a greater range of motion.
What is the role of the fulcrum in a lever system?
The fulcrum acts as the pivot point around which the lever rotates.
Name a sporting example of a third class lever.
A bicep curl.
What does the term ‘effort arm’ refer to?
The distance from the fulcrum to the point where the effort is applied.
Fill in the blank: The ______ arm is the distance from the fulcrum to the load.
load.
In levers, what does a longer effort arm provide?
It provides a greater mechanical advantage.
What is the formula to calculate mechanical advantage?
Mechanical Advantage = Length of Effort Arm / Length of Load Arm.
True or False: All levers are used to lift loads.
False.
What is a common example of a second class lever in sports?
A leg press machine.
How does the position of the fulcrum affect the lever type?
It determines whether the lever is first, second, or third class.
Give an example of a first class lever in the human body.
The neck when tilting the head back.
What type of lever is used when performing a chest press?
Third class lever.
What advantage do second class levers have in lifting?
They require less effort to lift a load.
In a lever system, what is the effect of increasing the effort distance?
It decreases the effort needed to lift the load.
What lever class is represented by a crowbar?
First class lever.
