270 likes | 281 Views
Forces. What is a Force? Push or Pull What does it do? Causes Motion How do we describe it? Size (magnitude) Direction. What are the 7 simple machines?. Lever Inclined Plane Wedge Screw Wheel and Axle Gear
E N D
Forces What is a Force? Push or Pull What does it do? Causes Motion How do we describe it? Size (magnitude) Direction
What are the 7 simple machines? • Lever • Inclined Plane Wedge Screw • Wheel and Axle Gear Pulley
Why do we use simple machines? • To make life easier! • Simple Machines change forces: change the direction change the size change both
Lever Change Force Direction Change Force Size Resulting Force X Distance = Applied 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
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