Question

if a mechanism allows a load of 10 newtons to be moved by an effort of 2 newtons, what is its MA? (it is metal works but there is no such thing in the pick a subject)

Answer 1

Answer:

Levers

Levers

Levers use mechanical advantage to make lifting or applying pressure easier. All levers are made of a bar and a pivot, called a fulcrum. Levers have three main parts:

effort - the amount of force applied by the user, also referred to as the input

fulcrum - where the lever pivots

load - the weight that needs to be moved, also referred to as the output

Mechanical advantage is the amount of help you get using a machine in comparison to doing something with just human effort, and it is created by levers.

It is measured by dividing the load by the effort applied to moving it, both measured in Newtons (N) - this could also be described as the output (load) divided by the input (effort):

mechanical advantage = load (N) ÷ effort (N)

Example

A person lifting a load of 200 N but only using 100 N of effort:



Therefore, the mechanical advantage = 200 ÷ 100 = 2.

This can also be written as 2:1. The person is able to lift twice the load using 100 N of effort.

The mechanical advantage can also be calculated theoretically by measuring the distance between the load and pivot and the effort and pivot.

In the picture below the distance between the load and fulcrum is 2 m. The distance between the effort and fulcrum is 6 m.



Therefore, the mechanical advantage = 6 ÷ 2 = 3 or 3:1

The person will find this load three times easier to lift.

In both examples we were able to calculate the mechanical advantage. It is possible to calculate any part of the formula as long as we have two pieces of information from the formula:



mechanical advantage = load ÷ effort

load = mechanical advantage × effort

effort = load ÷ mechanical advantage

Question

A person is using a lever to lift a rock with a 50 N load. The mechanical advantage is 5:1. How much effort is the person having to give?

Reveal answer

Classes of lever

There are three different types of levers. They are chosen for their ability to produce the most mechanical advantage for a particular task. These classes of lever arrange the effort, fulcrum and load in a different order:

First orderEffortFulcrumLoadSecond orderEffortLoadFulcrumThird orderFulcrumEffortLoad