# Mrs. Nunn: Motion

### 25 terms by mrslnunn Teacher

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### motion

continuous change in the position of an object (as judged by a reference point)

### reference point

object or location used to judge or measure motion; considered to be stationary

### speed

rate at which distance changes

### average speed

overall speed for a period of time; calculated as distance divided by time

### instantaneous speed

speed at a particular instant (moment in time)

### constant speed

speed that does not change

### velocity

speed + direction (for straight line motion)

### average velocity

overall velocity for a period of time; includes average speed + direction (for straight line motion)

### instantaneous velocity

velocity at a particular instant (moment in time)

### constant velocity

occurs when speed and direction do not change

### acceleration

1. rate at which speed or velocity changes 2. occurs whenever velocity (speed or direction) changes

### positive acceleration

occurs when a forward moving object speeds up

### negative acceleration

occurs when a forward moving object slows down

### speedometer

device that indicates the instantaneous speed of a vehicle

### deceleration

another word for negative acceleration

### uniform motion

occurs when there is no change in speed or direction (no acceleration)

### slope

the steepness of a line graph (in math, the rise over the run)

### distance

how far an object travels; the length of the path of motion

### time

the duration of an event; how long something lasts

### direction

answers the question, "which way?"; must be provided when describing velocity

### distance/time graphs

used to show the speed of a moving object; always set up with distance on the y-axis and time on the x-axis; slope = speed

### speed/time graphs

used to show the acceleration of a moving object; always set up with speed on the y-axis and time on the x-axis; slope = acceleration

### per

symbol is /; means division

### overall speed

same as average speed

### odometer

device that indicates distance traveled by a vehicle (such as a car or bike)

Example: