Work and Mechanical Advantage

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Presentation transcript:

Work and Mechanical Advantage

What is Work? Work….work….work…. Brain Pop: https://www.brainpop.com/science/motionsforcesandtime/ work/ Username: cmacschool Pass: brainpop

What is Work? Work….work….work…. Work is a force exerted on an object that moves the object some distance. Formula: Work= force X distance = F x d Work is measured in Joules (J) Force is measured in Newtons (N) Distance can be in a variety of measurements.

What is Work? Work….work….work…. Force Distance

Practice Problems: Example 1: You exert a force of 2N on a lever and it moved 0.6m. Calculate the work. Work = force x distance = 2N x 0.6m = 1.2J

Practice Problems: Example 2: If the work done on a car is 3J and the distance travelled was 10m, find the force. Force = work / distance = 3J/10m = 0.3N

Work Input and Work Output The work you do on the machine is called the input work. The work the machine does on the load is called output work.

Mechanical Advantage Input work is the work you do on a machine. Output work = work the machine does on the load (object) Mechanical Advantage (MA) is the comparison of the force produced by a machine to the force applied to the machine.

Mechanical Advantage Formula: Mechanical Advantage= Load force (FL) Effort force (FE)

Practice Problems: Ex 1: If you apply an effort force of 500N to a branch and the back of the truck weighs 2500N, what is the MA? MA = F(l) / F(e) = 2500N/500N = 5

Practice Problems: Ex 2: If the MA of a wedge is 9.6 and you applied an input force of 50N, what is the output force? Load Force = MA x effort force = 9.6 x 50N = 480 N

Mechanical Advantage Any object with a MA greater than one allows the user to move a large load with a smaller effort force.

Review Kahoot: Work & Mechanical Advantage Review