Work
What is the formula for work?
Work = Force x Displacement
What is the formula for Power?
Power = Work / Time
What object is defined by: When a cord is pulled, an object on the opposite side lifts up
What object is defined by: When a fixed beam is pushed down, the other end lifts up
Lever
What are the units for each of the 3 parts that make up Work?
Work = Joules
Force = Newtons
Displacement = Meters
What are the units for each of the 3 parts that make up Power?
Power = Watts
Work = Joules
Time = Seconds
What object is defined by: A round wheel and its center axle rotate together.
Wheel and Axle
What object is defined by? An inclined plane wrapped around a cylinder; it can hold things together.
Screw
A student pushes a supply cart with 32 N of force for 9 meters. How much work is done?
Work = 288 J
A machine does 900 Joules of work in 45 seconds. How much power does it use?
Power = 20 W
What object is defined by: A pointed or triangular tool that splits objects or holds them in place.
Wedge
What object is defined by: A ramp or slanted surface used to move items up or down.
Inclined Plane
A mover does 400 Joules of work using 50 Newtons of force. How far does it move?
Displacement = 8 Meters
A student is pulling a wagon with 360 W of Power. He uses 1440 J of work. How long did he pull the wagon for?
Time = 4 s
A jar of peanut butter is an example of what simple machine?
Screw
This is an example of what simple machine: A doorknob turns a central rod to open a door
Wheel and Axle
A lift uses 5,000 Watts for 9 seconds and raises a load 10 meters. What force is needed?
Force = 4,500 N
A crane uses 2,000 N of force for 8 seconds and raises a load 15 meters. What Power is needed?
Power = 3,750 W
What is the definition of a simple machine?
To make conducting work easier
When using simple machines how does the the use of force change?
Simple machines distribute work over a greater distance