| A | B |
|---|
| simple pulley | changes the direction of the force |
| steering wheel | example of a wheel and axle |
| wedges and screws | examples of incline planes |
| complex machines | made up of more than one simple machine |
| equilibrium | all forces balance each other |
| inertia | tendency of an object to resisit any change in motion |
| Newton's first law of motion | an object at rest stays at rest until a net force acts on it |
| Newton's second law of motion | describes how acceleration, mass, and net force are related. |
| Acceleration | rate at which the velocity of an object changes over time |
| Newton's third law of motion | when one object exerts a force on a second object, the second object exerts a force on the first object |
| machine | a device that changes the direction or the amount of force needed to do work |
| simple machine | a machine with only a few parts |
| pulley | consists of a rope or cable that runs thraough a grooved wheel - a simple machine |
| Inclined Plane | a simple machine consisting of a flat surface with one end higher than the other |
| Lever | a simple machine which a stiff bar rotates around a fixed point called a fulcrum |
| Sailing ship | Example of a complex machine |
| independent variable | remains the same, does not change |
| dependent variable | this variable changes |
| work divided by time | Power |
| Distance divided by time | Average speed |
