Mechanical Advantage vs Mechanical Efficiency Simple Machines Machines

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Mechanical Advantage vs. Mechanical Efficiency Simple Machines

Mechanical Advantage vs. Mechanical Efficiency Simple Machines

Machines and Work l l We said that machines make work easier b/c they

Machines and Work l l We said that machines make work easier b/c they change the size or the direction of the force (input). Force is measured in Newtons (N)

Mechanical advantage vs Mechanical Efficiency Mechanical Advantage (MA) - tells how many times a

Mechanical advantage vs Mechanical Efficiency Mechanical Advantage (MA) - tells how many times a machine multiplies force l Formula Mechanical Advantage = output force Input force l

Mechanical Advantage (continued) If your result is : l greater than 1 = the

Mechanical Advantage (continued) If your result is : l greater than 1 = the output force is greater than the input force (this is what you want b/c you don’t want to put in more force than you get out) l less than one = it requires more input force from you and does not have a mechanical advantage

Practice Problems for Mechanical Advantage (MA) You have to push a 500 N weight

Practice Problems for Mechanical Advantage (MA) You have to push a 500 N weight up a ramp and have to push with a force of 50 N. What is the Mechanical Advantage? l MA = output force so = Input force l The output force is ____ times greater than the input force

Practice Problems for Mechanical Advantage (MA) l l l Grace uses a cart to

Practice Problems for Mechanical Advantage (MA) l l l Grace uses a cart to lift canned foods. She uses an input force of 40 N to the cart and the cart applies an output force of 320 N. What is the Mechanical Advantage of the cart? MA = output force so ______ = Input force The output force is ____ times greater than the input force

Practice Problems for Mechanical Advantage (MA) l l If the Mechanical Advantage a Machine

Practice Problems for Mechanical Advantage (MA) l l If the Mechanical Advantage a Machine is 5, what does this mean? This means that the output force of the machine is 5 times greater than the input force

Mechanical Efficiency l l l is shown as a percent (%) that compares work

Mechanical Efficiency l l l is shown as a percent (%) that compares work output to work input. Work is measured in Joules Mechanical Efficiency = work output X 100 Work input This will give you a percentage

Mechanical Efficiency (continued) l **A machine cannot be 100% efficient b/c Machines have moving

Mechanical Efficiency (continued) l **A machine cannot be 100% efficient b/c Machines have moving parts which create FRICTION which causes energy input to be lost as heat. .

Mechanical Efficiency (continued) QUESTION: l What is the mechanical efficiency of a machine whose

Mechanical Efficiency (continued) QUESTION: l What is the mechanical efficiency of a machine whose work input is 100 J and work output is 30 Joules ? ? ? l ME = work ouput X 100 Work input l 30 X 100 = 30 percent 100

How do I remember MA and ME l l l ** A WAY TO

How do I remember MA and ME l l l ** A WAY TO REMEMBER THE DIFFERENCE BETWEEN MECHANICAL ADVANTAGE AND MECHANICAL EFFICIENCY IS MA FORCES ME TO DO WORK (MA INVOLVES FORCE, ME INVOLES WORK)

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