What is a Simple Machine?A simple machine has few or no moving parts. Simple machines make work easier
3 types of simple machines The inclined plane The Wedge The Screw
What is an inclined plane?A sloped surface An inclined plane allows you to exert your input force over a longer distance Ideal Mechanical Advantage =
Inclined Planes An inclined plane is a flat surface that is higher on one end Inclined planes make the work of moving things easier
Increase Force Increase distance When the output When the output force is greater force is less than than the input force the input force the the mechanical mechanical advantage is advantage is less greater than 1. than 1. • If only the direction changes, both the input force and output force will be the same
What is efficiency? Output Work / Input work x 100%
EFFICIENCY Theefficiency of a machine compares output work to input work Output Work 100 Input Work
Wedges Two inclined planes joined back to back. Wedges are used to split things.
Ideal Mechanical AdvantageInclined Plane Wedge Divide the length Length of the plane of the incline by divided by its width the height Longer and thinner the wedge is, greater the mechanical advantage
ScrewsA screw is an inclined plane wrapped around a shaft or cylinder. The inclined plane allows the screw to move itself when rotated.
Mechanical Advantage ofScrew length of thread around the screw by the height of the screw