MOTION A review

Vocabulary Speed with direction describes ________

What are some units for velocity? 600 km/min North 8 m/s south 65 mph west

When does velocity change? Velocity changes as Speed or Direction changes

Changes in Velocity: or slower Velocity changes when speed goes faster Velocity changes when direction changes 2m/sec up to 2m/sec down

Sample Problem 1 Juan is walking 2 m/s South on a train that is moving 60 m/s North. What is his velocity? 60-2 = 58m/s north

Sample problem 2 Jessica walks 3 m/s west to the front of a bus moving 30m/s west. What is her velocity? 30 + 3= 33 m/s west

Vocabulary When an object changes position over time when compared with a reference point Motion

1 km North Sandy needs to run errands. She walks 5 km north to return some movies. She keeps going north 3 km to buy groceries. She walks back south to her house. After 7 km she decides to stop at Starbucks. Where is she from her house?

Vocabulary The object that stays in place to compare motion Reference point

21 km North Jose drives 20 km north to downtown after dinner he walks 1 km south to the ballpark. After the game he walks 2 km north to his friend’s house. Where is he compared to his house?

Vocabulary The rate at which an object moves. It depends on the distance traveled and the time taken to travel that distance. Speed

Average Speed Average Speed = Total distance Total Time Example: 360km = 90km 4hrs. Hr.

A plane traveled 600 km in 2 hours. How fast was it traveling? 300 km/hr

Juan kicked a soccer ball 35m down field. The ball had a speed of 10m/s. How long did it take to get there? 3.5s

4 hours Julieta walked 20 km at 5 km/hr. How long did it take her to finish the race?

. In a position time graph the slope represents The speed

What is the speed of the object?

How far is the car moving between seconds 40 and 60?

What is happening to the speed?

What is the speed between 3 and 7?