What is a Machine?
Materials
Input
Machine
Object
Product
Output
What is a Machine?
Example - TV
Electricity
Signal
Input
TV
Object
Picture
Sound
Output
What is a Machine?
Simple Machine
Force
Input
Simple
Machine
Object
Force
Output
Forces
What is a Force?
Push or Pull
What does it do?
Causes Motion
How do we describe it?
Size (magnitude)
Direction
Why do we use simple machines?
• To make life easier!
• Simple Machines change forces:
change the direction
change the size
change both
What are the 6 simple machines?
• Inclined Plane
Wedge
Screw
• Lever
• Wheel and Axle
Pulley
How do simple machines work?
Conserve Energy
Applied
Resultant
Force x Distance = Force x Distance
force
x
Distance = Force x
Distance
Incline Plane
Change Force Direction
Change Force Size
Wedge
Change Force Direction
Change Force Size
Screw
Change Force Direction
Change Force Size
Lever
Change Force Direction
Change Force Size
Resulting Force X Distance = Applied Force X Distance
Wheel and Axle
Same Direction
Change Force Size
Resultant Force X Wheel Radius = Applied Force X Axle Radius
Gears
Change Force Direction
Change Force Size
Pulley
Change Force Direction
Same Force Size
Scavenger Hunt
Find the Simple Machines
In Your Classroom
Hubble!