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# Wise Simple Machines

### chapter 19 (red book)

Rate of motion calculated by dividing the distance traveled by the amount of time it takes to travel that distance. Average speed
A push or a pull; SI unit is the Newton. Force
A combination of simple machines. Compound machine
An object with a groove, like a wheel, with a rope or chain running through the groove. Pulley
A rod or plank that pivots about a fixed point. Lever
The speed of an object at any given time. Instantaneous speed
A set of rules developed by Isaac Newton to explain how forces change the motion of an object. Newton's Laws of Motion
The tendency to resist a change in motion. Inertia
A change in velocity divided by the amount of time needed for the change to occur; takes place when an object speeds up,slows down, or changes direction. Acceleration
The number of times a machine multiplies the effort force you apply to it. Mechanical advantage
This is done when an applied force causes an object to move in the direction of the force. Work
Force that resists motion between two touching surfaces and always acts opposite to the direction of motion. Friction
Speed of an object and its direction of motion; changes when speed changes, direction of motion changes, or both change. Velocity
The measure of the amount of matter an object has. Mass
A sloped surface (simple machine). Inclined plane
A device that makes work easier with only one movement; can change the size or direction of a force. Simple machine
Created by: bwise