The length of a lever of class I is 400 cm. Calculate the mechanical advantage of the lever if it's fulcrum is located at a distance of 200cm from the effort.
Answers
Answer:
Length of the crowbar = 400cm
Length of the effort arm (E.A) = 200cm
Length of the load arm (L.A) = 400 - 200
= 200cm
So,
M.A (Mechanical Advantage) = E.A/L.A
= 200/200
= 20/20
= 2/2
= 1 (Ans)
Explanation:
Levers are the most basic machines which are used to do some work with minimal effort. A lever amplifies an input force to provide a greater output force, which is said to provide leverage.
Types of liver
According to where the load and effort are located with respect to the fulcrum, there are three types or classes of lever:
First Class Lever
This is a type of lever which has the fulcrum in between the weight and the force applied. Its order is represented as force-fulcrum-weight. This is the most basic type of lever.
Examples
Our hand pushing an object or seesaws, crowbars.
Using scissors represents the use of two first-class levers.
A wheel and axle is also an example.
Pulling a nail out of a wooden plank also represents a first-class lever.
Second Class Lever
In this, the fulcrum is at one end and the force applied is on the other end. The weight is situated in the middle of these two. The order of this would be fulcrum-weight-force. The application of force at one end will result in some work done on the other end.
Example:
Wheelbarrow
Staplers
Doors or gates
Bottle openers
Nutcracker
Nail clippers
Third Class Lever
These are the levers in which the fulcrum is at one end and the force is applied in the middle and the weight is on the other end. The order is represented as a weight-force-fulcrum. In this case, we have to apply more energy to displace the weight to a longer distance.
Example:
Fishing rod
A broom
A baseball bat
A bow and arrow
Human jaw
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Answer:
M. A. =1
Explanation:
Length of the lever = 400 cm
Length of the effort arm = 200 cm
Length of the load arm = 400 cm - 200 cm
= 200 cm
M. A. = Length of the effort arm / Length of the load arm
= 200 cm / 200 cm
= 1
