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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 an object is moved in the direction of the force
These 2 things must be present in order for work to be occurring power and force
What is the work formula W=F x D
Power the rate at which work is done
What is the power formula P=W/T
Watt The unit used to express power
Machine a device that helps make work easier by changing the size or direction of an object
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 when there is no friction between the machines parts
“Machines don’t save work”. True or false? Explain your answer True because work needs to be put into it and it just makes the work easier.
Mechanical Advantage tells how many times the machine multiplies work
Mechanical Advantage formula (MA)=output force/input force
What are the 6 simple machines lever, inclined plane, wedge, screw, wheel and axel, and pulley
Lever a simple machine consisting of a bar that pivots on a fixed point
Examples of levers se saw, hammer, kayak
Fulcrum the fixed point of a lever
Examples of each of the 3 classes of levers se saw, wheel barrow, hammer
Inclined Plane a simple machine that is straight, slanted surface
How do you increase the mechanical advantage of an inclined plane create a lower angle
Examples of Inclined Planes a piece of wood on a truck
Wedge a double inclined plane that moves
Examples of Wedges Knife
Screws an inclined plane that is wrapped in a spiral
Examples of Screws screw
How do you change the mechanical advantage of a screw make the spiral larger
Wheel & Axle a simple machine consisting of two or more circular objects of different sizes
Examples of Wheel & Axle door knob
Pulley a simple machine consisting of a grooved wheel that holds a rope or cable
Examples of Pulleys cable car
Created by: Nick Curtis
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