# Physics test 2

## Terms

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- Speed
- The rate at which an object moves. (distance /time)
- Average speed
- the average distance traveled (total distance/total time)
- Constant speed
- steady unchanging speed.
- Velocity
- distance traveled per unit time (distance/time)
- Acceleration
- The rate at which an object's velocity changes with time. (final velocity â€“ original velocity /time)
- Frame of reference
- background or object that is used for comparison
- Momentum
- The product of an objects mass and velocity (mass*velocity)
- Force
- a push or pull exerted on an object (mass*acceleration)
- Friction & 3 types
- A force that one surface exerts on another when the two rub against each other. The three types are fluid, rolling, sliding.
- Mechanical advantage
- The number of times a force is exerted on a machine is multiplied by the machine.
- 6 types of simple machines and examples of each
- inclined plane (ramp) wedge (zipper) , the screw (jar lids), the lever (crow bar), the wheel and axle (doorknob), and the pulley (flagpole rope)