Work
The transfer of energy that occurs when a force is applied over a distance.
Work
The rate at which work is done.
Power
The ratio of a machine’s output to input force.
Mechanical Advantage
A simple machine, made of a bar that pivots from a fixed point.
Lever
An inclined plane wrapped around a cylinder.
Screw
What is the formula for work?
Work=Force times distance.
What is the formula for Power
Power=Work divided by time
The ratio of the output work to the input work.
Efficiency
The point at which a lever pivots.
Fulcrum
A grooved wheel with a rope or cable wrapped around it.
Pulley
What is the SI unit for Work?
Joules
What is the SI unit for power?
Watts
Machines that do work with one movement.
Simple Machine
A shaft attached to a wheel of a large diameter so that both can rotate together.
Wheels and Axles
A ramp in a building is an example of which machine?
Inclined Plane
What is a sign that work is being done?
Movement
A force that does not make an object move does NO
Work
Doing work on an object transfers __________________________ to that object.
Energy
A flat, sloped surface.
Inclined Plane
What kind of machine does work using one movement?
Simple Machine
Marti pushes a desk 2.0 meters across the room using a constant force of 25 Newtons. How much work does Marti do to the desk?
50 Joules
Marti does 80 J of work while moving a desk for 10 seconds. How much power did she use?
8 Watts
What are the three ways machines make work easier?
The size of the force
The distance the force acts
The direction of a force
Two inclined planes stuck together
Wedge
What kind of machine uses 2 or more simple machines working together?
Compound Machine