Comp 1 Flashcards
What are the three types of levers?
First class, second class, third class
In a first-class lever, where is the fulcrum located in relation to the effort and load?
Between the effort and the load
Give an example of a first-class lever in the human body.
Seesaw motion of the head on the neck
In a second-class lever, where is the load located in relation to the fulcrum and effort?
Between the fulcrum and the effort
Give an example of a second-class lever in the human body.
Raising the body up on the toes
In a third-class lever, where is the effort located in relation to the load and fulcrum?
Between the load and the fulcrum
Give an example of a third-class lever in the human body.
Bending the arm at the elbow
What is mechanical advantage in a lever system?
The ratio of the load force to the effort force
What is the formula for calculating mechanical advantage in a lever system?
Mechanical advantage = Load force / Effort force
In which type of lever is the mechanical advantage always greater than 1?
Second-class lever
What is the formula for calculating the distance ratio in a lever system?
Distance ratio = Effort arm length / Load arm length
How does the distance ratio affect the force required in a lever system?
A greater distance ratio means less force is required
What is the principle of moments in a lever system?
The sum of the clockwise moments equals the sum of the anticlockwise moments
What is the equation for the principle of moments in a lever system?
Force x Distance = Force x Distance
How can a lever system be used to lift a heavy load with less effort?
By increasing the mechanical advantage or using a longer effort arm
