Simple Machines.

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Presentation transcript:

Simple Machines

Simple Machines Machines are tools that make jobs easier by: Changing the size of the force Changing the direction of the force Increasing the speed or distance the object is moved

Simple Machines Inclined Plane Wedge Screw

Simple Machines Lever Pulley Wheel & Axle

Mechanical Advantage Mechanical Advantage (MA) is the number of times a machine multiplies the force being applied Ideal mechanical advantage (IMA) is the number of times the applied force is multiplied under ideal conditions. This assumes no friction!

Mechanical Advantage Actual mechanical advantage (AMA) is the number of times the applied force is multiplied under real conditions

Calculating IMA We can calculate IMA for simple machines with this formula. Where dE is the distance of effort and dR is the distance of resistance.

Calculating IMA For a ramp 10m long and 2m high: dE=ramp length=10m   dE=ramp length=10m dR= ramp Height=2m

Calculating AMA

Calculating AMA  

Efficiency Efficiency tells us how efficent a machine is and is expressed as a percent. Efficiency = WOut/Win x 100 OR Efficiency = AMA/IMA x 100

Efficiency  

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