# MOTION is a change in position of an object with respect to time

## Presentation on theme: "MOTION is a change in position of an object with respect to time"— Presentation transcript:

MOTION is a change in position of an object with respect to time
any movement or change in position or place is always observed and measured relative to a frame of reference and its change in position to another reference frame

60 kilometers / 2 hours = 30 km/hr or 30 kmh
SPEED Distance an object travels in a unit of time s = d / t speed = distance/ time Example: Bob drove to his parents house that was 60 kilometers away it took him 2 hours, How fast was he traveling? 60 kilometers / 2 hours = 30 km/hr or 30 kmh

How do we figure units? the UNIT for speed is
Any distance unit over any time unit. Some distance units examples: m, cm, km, etc. Some time units examples are: hr, min, days, month, years, etc. ***when expressing units with division a forward slash means per ex. mi/ h (miles per hour) or m / s or ft / h

Solving for another variable
-if s = d / t we can solve for any of these three variables -to solve for distance we would cross multiply both sides by the time, cancel, and then solve s = d / t t * s = (d / t) *t (the t’s cancel) to give you d = s * t - to solve for time you do the same with an extra step s = d / t t * s = (d / t) *t the t’s cancel to give you d = s * t then you divide by s on both sides d/ s = s * (t/ s) s’s cancel to give you t = d / s

3 Types of Speed 1- instantaneous- speed at any specific instance
2- average- total distance over a period of time interval, accounts for speed variations during time. ex. 32 km +13 km = 45 km = total distance 2 h + 1h = 3h = total time avg. speed = 45 km/ 3 h = 15 km/h 3- constant- when speed of an object does not vary. ex. satellite