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Ty Phy Sci Chpt 8

Work and Machines

QuestionAnswer
when a force causes an object to move in the direction of the force work
the unit used to express work; the newton-meter joule
the rate at which work is done power
the unit used to express power; joules per second watt
Explain the difference between work and power. Work occurs when a force causes an object to move in the direction of the force while power is the rate at which work is done
a device that helps make work easier by changing the size or direction of the force machine
the work you do on a machine work input
the work done by the machine work output
tells you how many times the machine multiplies force; compares the force input with the force output mechanical advantage
a comparison-expressed as a percentage-of a machine's work output with the work input mechanical efficiency
How does using a ramp make work easier? it allows you to apply a smaller input force than you would need to lift a load straight up
Whay can't a machine be 100% efficient? some of the work input is used to overcome friction
If you exert 15 N on a machine, and the machine exerts 300 N on another object, what is the machine's mechanical advantage? 20
What is the mathematical formula for mechanical advantage? output force / input force
What is the mathematical formula for mechanical efficiency? (work output / work input) x 100
a simple machine consisting of a bar that pivots at a fixed point called a fulcrum lever
a simple machine that is a straight, slanted surface inclined plane
a double inclined plane that moves wedge
an inclined plane that is wrapped in a spiral screw
a simple machine consisting of two circular objects of different sizes wheel and axle
a simple machine consisting of a grooved wheel that holds a rope or cable pulley
machines that are made of two or more simple machines compound machine
Created by: beth2244
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