Upcoming SlideShare
×

# physics

325 views

Published on

science

Published in: Technology, Education
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Be the first to comment

• Be the first to like this

### physics

1. 1. Test Review Page 296  Definitions of quantities Pg. 320- 323  Question 2 (329) Pg. 354 – 356  Question 3 (358)
2. 2. <ul><li>Slope = y / x </li></ul><ul><li>Slope = distance / time </li></ul>Average Speed = m/s Distance vs. Time graphs
3. 3. Distance vs. Time graphs A car’s Motion
4. 5. <ul><li>During which interval is the cars average speed the greatest? </li></ul><ul><li>0-2 s </li></ul><ul><li>2-4 s </li></ul><ul><li>4-6 s </li></ul><ul><li>6-8 s </li></ul>How can you tell?
5. 6. <ul><li>2. Calculate the average speed of the car from 4s to 6s ? </li></ul><ul><li>3. Use the graph and describe the cars motion during the trip </li></ul>
6. 7. Questions about Average Speed <ul><li>Sarah backstrokes at an average speed of 8 m/s , how long will it take her to complete 200 m race? </li></ul><ul><li>Laurens SUV was found speeding at a 60 km/hr zone. How many km/hr is she travelling over the speed limit if she covered a distance of 10km in 5 minutes? </li></ul>
7. 8. Distance Vs. Time Graph
8. 9. Position vs. Time graphs <ul><li>Slope = y / x </li></ul>Av . Velocity= d (change in pos)/ t =m/s (direction)
9. 10. Direction!
10. 11. <ul><li>During which time intervals is the object stationary? </li></ul><ul><li>0-2 s </li></ul><ul><li>4-6s </li></ul><ul><li>6-8 s </li></ul><ul><li>8-10s </li></ul>How do you know quantitavely?
11. 12. <ul><li>2. What is the average velocity of the car between 8 s and 10 s? </li></ul><ul><li>3. When is the cars average velocity the greatest? </li></ul><ul><li>4. Using the graph, describe the cars overall average velocity during its trip </li></ul>
12. 13. Write a description about the motion that graphs might describe
13. 14. Velocity Questions <ul><li>A student walks 2.5 km (E) and then 5.9 km ( S) in 2 hr. Calculate the average velocity </li></ul><ul><li>2. A dog runs 1.3 m (N) and turns around and runs 4 m (S) in 20 min. What is the dogs average velocity? </li></ul>
14. 15. Acceleration = a <ul><li>  Accel.= change in velocity / change in time </li></ul><ul><li>a = v / t </li></ul><ul><li>(How fast you change how fast you are going!) </li></ul><ul><li>Vector = Magnitude (size) + Direction </li></ul><ul><li>  Units: m/s 2 </li></ul>
15. 16. Sample Problem <ul><li>A train starts from rest, and accelerates to a final velocity of 500 m/s (E) in a time of 180 s. Calculate the trains acceleration </li></ul>
16. 17. A car travelling at a velocity of 30 m/s (S) encounters an emergency and comes to a stop. How much time will it take for the car to stop if it decelerates at –4.0 m/s 2