26 terms

# Chapter 15 Science Terms

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Work
a force acting through a distance
ForcexDistance=
Work
One Newton-meter is equal to
a Joule
Power
rate at which work is done, or the amount of work done per unit of time
Work/Time=
Power
Large quantities of power are measured in
Kilowatts
One joule/second is known as a
Watt
750 watts equals
one Horsepower
This makes work easier
a machine
Effort force
Force applied to the machine
Work done on a machine is
Work Input
Force applied by the machine
Resistance Force
Work done by a machine
Work Output
the number of times a machine multiplies the effort force
Efficiency
The comparison of work output to work input
A slanted surface used to raise an object
Inclined plane
An inclined plane that moves (most are made of two inclined planes)
Wedge
An inclined plane wrapped around a cylinder to form a spiral
Screw
A bar that is free to pivot or move about a fixed point when an effort force is applied
Lever
The fixed point on a lever
Fulcrum
___________ class levers multiply the effort force and change its direction. Fulcrum is between Resistance force and Effort Force
First
___________ class levers have the Resistance force between the Fulcrum and the Effort force
Second
___________ class levers have the Effort force between the Resistance force and the Fulcrum. Effort force is greater than the resistance force and the lever multiplies the distance of the effort force.
Third
Pulley
A chain, belt or rope wrapped around a wheel. This may change the direction or the amount of the effort force.
A lever that rotates in a circle
Wheel and Axle
Compound Machine
a combination of two or more simple machines