science Flashcards
The product of force and distance.
Work
The rate of doing work
Power
The SI unit of work
Joule
The SI unit of power
Watt
The number of times that the machine increases an input force.
Mechanical Advantage
The percentage of work input and work output of a machine.
work output/work input x 100%
Efficiency
A rigid bar that is free to move around a fixed point.
Lever
The fixed point a bar rotates around.
Fulcrum
A simple machine that consists of a disk and a cylinder through it, each one with a different radius.
Wheel and Axle
A slanted surface along which a force moves.
Inclined Plane
The force you exert on a machine.
Input Force
The distance the force acts through.
Input Distance
The force that is exerted by the machine.
Output Force
The distance the output force is exerted.
Output Distance
AMA
Output force/Input force
IMA
Input distance/Output distance
a force that acts on a body moving in a circular path and is directed toward the center around which the body is moving.
Centripetal force
An inclined plane wrapped around a cylinder
Screw
is a simple machine that consists of a rope that fits into a groove in a wheel.
Pulley
is a wheel attached in a fixed location?
Fixed Pulleys
is attached to the object being moved rather than to a fixed location
Movable Pulley
By combining fixed and movable pulleys into a _________ a large mechanical advantage can be achieved
Pulley system
is a combination of two or more simple machines that operate together
Compound Machines
a device that changes force
Machines
is the distance between the input force and the fulcrum
Input arm
is the distance between the output force and the fulcrum
Output arm
equal to about 746 watts
horsepower
the mechanical advantage has to be greater than 1 equal to 1 or less than 1
first-class lever
the mechanical advantage is always greater than 1
second-class levers
the mechanical advantage is always less than 1
third-class levers
is a V-shaped object whose sides are two inclined planes sloped toward each other
Wedge
