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ARIIIBBBAAA!

Chapter Ocho

QuestionAnswer
Work When a force causes an object to move in the direction of the force
Work is ONLY done when When a force makes an object move
These 2 things must be present in order for work to be occurring The object moves as a force is applied; the direction of the object’s motion is the same as the direction of the force applied
What is the work formula? W=F x d (Work=Force x distance)
Power The rate at which work is done
What is the power formula? P=W/t (Power=Work/time)
Watt Unit used to express power. More complex version is J/s (Joules per second)
Machine Helps make work easier by changing the direction or size of the force
Work Input The work you do on a machine
Work Output Work done by the machine
Machines don’t “save work”. True or false? True. They make work easier, but do not make you do any less work.
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? Inclined Plane, Lever, Wedge, Screw, Wheel & Axle, Pulley
Lever Simple machine consisting of a bar that pivots at a fixed point
Examples of Levers Seesaw, hammer
Fulcrum The fixed point in a lever
Examples of each of the 3 classes of levers Seesaw (first class), wheelbarrow (second class), hammer (third class)
Inclined Plane Simple machine that is a straight, slanted surface
How do you increase the mechanical advantage of an inclined plane? Increase the length of the plane, but not the height
Example of Inclined Planes Ramp
Wedge Double inclined plane that moves
Example of Wedges Knife
Screws Inclined plane that is wrapped in a spiral
Example of Screws A screw…ummm
How do you change the mechanical advantage of a screw? Make the spirals in the screw closer together
Wheel & Axle Consists of 2 circular objects of different sizes
Examples of Wheel & Axle Doorknob, sink faucet
Pulley Consists of grooved wheel that holds rope or cable
Example of Pulleys Crane
Created by: PhySciLewis1
Popular Physical Science sets

 

 



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