MOTION is a change in position of an

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

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 + 1 h = 3 h = total time avg. speed = 45 km/ 3 h = 15 km/h 3 - constant- when speed of an object does not vary. ex. satellite

1. A boat is traveling at a speed of 70 km per hour. It has to travel a distance of 210 km. How long will it take? 2. A car takes four hours to reach its destination. The distance was 340 miles. What was its speed? 3. A car travels 300 km in six hours. What is the speed of the car? 4. What is the speed of a jet plane that flies 7200 km in 9 hours? 5. The speed of a cruise ship is 50 km/hr. How far will it travel in 14 hours? 6. The speed of a rocket is 16, 000 km/hr, and it will take 66 hours to complete its mission. How far will it go? 7. What is the speed of a cyclist that travels 60 km in 2 hours? 8. A snail wants to participate in the Boston Marathon, a distance of 26 miles. His top speed is 0. 01 miles per hour. Assuming he maintains top speed for the entire race, how long will it take him to finish? 9. A rocket takes off at 8000 miles per hour and travels for 10 hours? What distance has the rocket traveled? Answer these Q’s then make up 6 of your own and answer them All on one paper