a bar, board, or circle that pivots about a fulcrum.

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Presentation transcript:

a bar, board, or circle that pivots about a fulcrum.

Lever

2 circular objects of different sizes

Wheel & axle

grooved wheel that holds a rope and a load.

pulley

a straight slanted surface

Inclined plane

is an inclined plane wrapped in a spiral

Screw

double inclined plane that moves used to split things apart.

Wedges

The formula for work is?

Work = Force x distance Recall you must have both going in the same direction in order for work to be done.

The units for work is ___?

Joules

What is the formula for power?

Power = Work time or Power = Force x distance time

What is the unit for Power?

Watts Recall kilowatt is 1000 watts

Which would have the greatest wattage a 40 W, 60W, or 100 W lightbulb?

100 Watt bulb

What is the definition of Power?

The rate at which work is done or how fast work is done.

What is efficiency?

How much of the work put into a machine is changed to useful work put out by a machine and is usually expressed as a percentage.

What is the formula for effeciency?

Efficiency = Wout x 100% Win

What is mechanical advantage?

MA tells you how many times a simple machine multiplies your effort force. It compares input force (FI) your effort with the output force (FO) done by the machine.

The formulas for MA are related to what 2 things?

We can use 2 other formulas to calculate Mechanical Advantage as well We can use 2 other formulas to calculate Mechanical Advantage as well! MA = Fload MA = d effort ______ ______ Feffort d load If given forces If given distances

What is the force distance payoff ?

You will reduce the effort force put into a machine, but you will have to travel a greater distance.

What is the MA of this pulley?

MA = 4

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