01+Motion+in+General

Since an object rarely travels at a constant speed we use an average speed.

__**Instantaneous Speed**__- The speed something has at any instant. ex. the speed shown by the speedometer of a car. in miles per hour or kilometers per hour. If we say that a car's speed at a given instant is 60 kilometers per hour, we are talking about instantaneous speed.

__**Velocity**__- Speed plus the direction of motion.( can be used interchangeably with speed) - it is how fast something is moving and in what DIRECTION. constant velocity means constant speed with NO CHANGE in direction. ex. a car that rounds a turn with a constant speed does NOT have a constant velocity because the direction of travel changed. velocity can be constant only when motion is along a straight-line path.

__**Acceleration**__- The rate of change in velocity -velocity of something can be changed by changing its speed, by changing its direction, or by changing both its speed and direction. Deceleration (or negative acceleration) is a large decrease per second in the velocity of the car (when it slows down using its breaks).

__**Speed**__= Distance/ Time (Measured In Meters Per Second(M/S))

__**Average Speed**__= Distance Covered/ Time Interval

__**Acceleration**__= Change of Velocity/ Time Interval (Measured In Meters Per Second Per Second (M/S/S))