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chapter 8 word$

QuestionAnswer
Work occurs when a force causes an object to move in the direction of the force
Work is ONLY done when a force makes that object move
These 2 things must be present in order for work to be occurring object moves as the force is applied, and the direction of the objects motion is the same as the direction of the force applied
What is the work formula work equals force times distance
Power the rate at which work is done
What is the power formula power equals work done/time
Watt expressed in joules per second called watts
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 or false? Explain your answer they don’t they just decrease the amount of input force needed
Mechanical Advantage tells you how many times the machine multiplies force
Mechanical Advantage formula output force/input force
What are the 6 simple machines lever, inclined planes, wedges, wheel, pulley, screws
Lever consist of a bar that pivots from a fixed point, called a fulcrum
Examples of lever hammer, seesaw
Fulcrum the fixed point used by levers
Examples of each of the 3 classes of levers seesaw, bottle cap opener, barbells
Inclined Plane a straight slanted surface
How do you increase the mechanical advantage of an inclined plane making it longer
Examples of Inclined Planes ramps for bikes or skateboards
Wedge a double inclined plane that moves
Examples of Wedges a knife
Screws inclined plane wrapped in a spiral
Examples Screws a screw
How do you change the mechanical advantage of a screw the longer the spiral
Wheel & Axle two circular objects of different sizes
Examples of Wheel & Axle doorknob
Pulley grooved wheels that holds a rope or cable
Examples of Pulleys cranes
Created by: likeab0ss on 2012-02-15



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