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QuestionAnswer
• Work occurs when a force causes an object to move in the direction of the force
• Work is ONLY done when ………… you are touching the object and applying the force
• These 2 things must be present in order for work to be occurring force and motion
• What is the work formula ? W equals F times d
• Power – include picture(s) the rate at which work is done
• What is the power formula? P equals W over t
• Watt - include picture(s)the unit used to express power
• Machine - include picture(s) a device that helps make work easier by changing the size or direction of the force
• Work Input the work you do on a machine
• Work Output the work done by a machine
• When can work output be GREATER than work input? work output can never be greater than work input
(carefully read last paragraph p. 193)
• “Machines don’t save work” . True or false? Explain your answer true
• Mechanical Advantage tells you how many times the machine multiplies force
• Mechanical Advantage formula MA equals output force over input force
• What are the 6 simple machines ? lever, fulcrum, inclined plane, wedge, screws, wheel & axel, pulley
• Lever a simple machine consisting of a bar that pivots at a fixed point called a fulcrum
• Examples of - include picture(s) hammer teder todder
• Fulcrum a fixed point
• Examples of each of the 3 classes of levers - include picture(s) weight as in lift, wheel barrel, hammer
• Inclined Plane 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 -- include picture(s) ramp
• Wedge double inclined plane that moves
• Examples of Wedges - - include picture(s) knife, plows and doorstops
• Screws an inclined plane that is wrapped in a spiral
• Examples Screws -- include picture(s) jar head and screws
• How do you change the mechanical advantage of a screw? unwind the screws to make it longer
• Wheel & Axle 2 circular objects of different sizes
• Examples of Wheel & Axle -- include picture(s) doorknob
• Pulley consisting of a grooved wheel that holds a rope or a cable
• Examples of Pulleys -- include picture(s) block and tackle, fixed and movable
Created by: PhySciLewis1
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