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JA work and machines

QuestionAnswer
• Work occurs when a force causes an object to move in direction of the force.
• Work is ONLY done when when the direction of the force and the direction of the motion are the same direction
• These 2 things must be present in order for work to be occurring force and motion
• What is the work formula? W=F*D
• Power – the rate at which work is done
• What is the power formula? P=W /t
• Watt – joules per second (j/s)
• Machine – a device that helps make work easier by changing the size or direction of a force
• Work Input the work you do on a machine
• Work Output the work done by the machine
• When can work output be GREATER than work input? never
• “Machines don’t save work” true, it is always the same amount of work it is just simplified
• Mechanical Advantage – tells you how many times the machine multiplies force
• Mechanical Advantage formula – MA=output force/input force
• What are the 6 simple machines ? levers, pulleys, inclined planes, wedges, screws, and wheel and axels
• Lever a simple machine consisting of a bar that pivots at a fixed point called a fulcrum
• Examples of levers seesaws, wheel barrels, hammers
• Fulcrum the point at which the lever pivots
• Examples of each of the 3 classes of levers FIRST CLASS=seesaw SECOND CLASS= barrel THIRD CLASS=hammer
• Inclined Plane a simple machine that is a straight slanted surface
• How do you increase the mechanical advantage of an inclined plane? the longer the inclined plane is to its height
• Examples of Inclined Planes ramps
• Wedge s double inclined plane that moves
• Examples of Wedges knifes
• Screws an inclined plane that is wrapped in a spiral
• Examples Screws – a screw
• How do you change the mechanical advantage of a screw? make the spirals longer and closer together
• Wheel & Axle a simple machine consisting of two circular objects of different sizes
• Examples of Wheel & Axle – turning on a faucet
• Pulley a simple machine consisting of a grooved wheel that holds a rope or cable
• Examples of Pulleys – a construction crane
Created by: PhySciLewis1
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