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ch. 8 vg

QuestionAnswer
• Work when a force causes an object to move in the direction of the force
• Work is ONLY done when force is applied
• These 2 things must be present in order for work to be occurring the object moving when force is applied and the direction of the object
• What is the work formula ? work equals force times distance
• Power is the rate at which work is done
• What is the power formula? Power equals work over time
• Watt the unit used to express power; equivalent to joules per second
• Machine a device that helps make work easier by changing the size or direction (or both) of a force
• Work Output the work done by a machine; the product of the output force and the distance through which it is exerted
• When can work output be GREATER than work input?
(carefully read last paragraph p. 193)
• “Machines don’t save work” . True or false? Explain your answer
• Mechanical Advantage
• Mechanical Advantage formula
• What are the 6 simple machines ?
• Lever
• Examples of - include picture(s)
• Fulcrum
• Examples of each of the 3 classes of levers - include picture(s)
• Inclined Plane
• How do you increase the mechanical advantage of an inclined plane?
• Examples of Inclined Planes -- include picture(s)
• Wedge
• Examples of Wedges - - include picture(s)
• Screws
• Examples Screws -- include picture(s)
• How do you change the mechanical advantage of a screw?
• Wheel & Axle
• Examples of Wheel & Axle -- include picture(s)
• Pulley
• Examples of Pulleys -- include picture(s)
Created by: vincent1111
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