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26 Cards in this Set

  • Front
  • Back
When is work done?
Work is done when a force causes an object to move in the same direction that the force is applied.
When you hold a book, are you doing work?
No
When is no work done?
No work is done when the motion of an object is at a right angle of the applied force.
What is the equation for work?
Force x Distance
What is power?
Power is the rate at which work is being done.
What is the equation for power?
Work/Time
What is input force?
The force that you apply on a machine is the input force.
What is output force?
The force that the machine applies is the output force.
What is the mechanical advantage?
The number of times a machine increase the input force is the mechanical advantage.
What is the equation for finding the mechanical advantage?
Output force/Input force
What is efficiency?
The efficiency of a machine is the ratio of the output work to the input work.
What is the equation for finding efficiency?
Output work/Input work
Machinces let you use less force over a greater _________.
Distance
What is the pivot point on a lever?
Fulcrum
What is power measured in?
Watts
What is work measured in?
Joules
What is a simple machine?
A simple machine is a machine that does work with only one movement.
What is a compound machine?
A machine made up of a combination of simple machines.
What is a inclined plane?
An inclined plane is a flat, sloped surface.
T or F: As the length of the inclined plane increases, the force needed is decreased.
True
What is the equation for finding work?
Work/Distance
What is a wedge?
A wedge is an inclined plane that moves.
What is a screw?
A screw is an inclined plane wrapped around a cylinder or post.
What is a lever?
A lever is any rigid rod or plank that pivots, rotates, about a point.
What is a wheel and axle?
A wheel and axle is two circular objects of different diameters attached so that they rotate together.
What is a pulley?
A pulley consists of a grooved wheel with a rope or cable wrapped over it.