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# 1.Acceleration is a change in ______________ or ___________________. - Acceleration includes: - starting -stopping -slowing down -speeding up - changing.

## Presentation on theme: "1.Acceleration is a change in ______________ or ___________________. - Acceleration includes: - starting -stopping -slowing down -speeding up - changing."— Presentation transcript:

1.Acceleration is a change in ______________ or ___________________. - Acceleration includes: - starting -stopping -slowing down -speeding up - changing direction 1

2.An object traveling at a constant speed does/does not accelerate because its speed does/does not change. 2

3. What is the acceleration of the car between 4 and 6 seconds? 3

4.The formula for average speed is ____________________________ 4

5. What is the average speed of the car after 5 seconds? 5

6. What is the average speed of car A after 3 seconds? 6 Car A Car B

. Match the graphs below to the statements. 7 7. A car traveled 50 m at 40 km/hr, then traveled 20 m at 30 km/hr 8. A car traveled 50 m at 30 km/hr, then traveled 20 m at 40 km/hr

7. Match the graphs below to the statements. 8 9. A car decelerated (slowed down) from 40 km/hr to 30 km/hr, then traveled 30 m 10. A car traveled at 30 km/hr for 50 m, then accelerated

11. When two forces are balanced: A. No motion occurs B. The object accelerates C. The object continues in the same direction as before 9

12.When an object is acted on by unbalanced forces, what ALWAYS happens? A. No motion occurs B. The object continues in the same direction C. The object accelerates D. The object stops 10

13. What is the net force in the system below? 4 N 8 N 11

14. What is the net force in the system below? 12 12 N 10 N

15. Draw the graph for the following statement: A roller coaster going down a big hill. 13 Distance Speed (km/hr)

16. Draw the graph for the following statement: A pitcher throwing a baseball. 14 Distance Speed (km/hr)

17. Draw the graph for the following statement: A car traveling from one stop sign to the next. 15 Distance Speed (km/hr)

18. For an experiment, the materials required are: toy car meter stick ramp weights stopwatch The objective of the experiment is probably to: a.Test how friction affects the speed of the car b.Test how the angle of the ramp affects the speed of a car c.Test how mass affects the speed of the car 16

19. Explain how each item would be used in the experiment you chose in number 17. toy car meter stick stopwatch ramp weights ___________________________________ _____________________________________ ______________________________________ 17

20. If a car travels East at 60 mph, then changes direction and travels northeast at 60 mph, what happens to A. its speed? B. Its velocity? 18

9. A racecar is traveling around a track at a constant speed of 200 miles/hr. Which point on the track is it accelerating? Explain why/why not. 19

10. The race car is traveling at a constant speed of 200 mi/hr all the way around the track. Explain why its velocity is different at each point A, B, and C. 20

11. What is the difference between speed and velocity? Make a venn diagram 21

12. What is acceleration? And how do you calculate it? 22

13. A 4000 kg truck and a 1000 kg car are racing. 10,000 N of force is applied to each of them. What will be the acceleration of the truck and of the car? Remember, if F = ma, then A = F/m - The truck’s acceleration will be _______ - The car’s acceleration will be _____ Which will accelerate faster and by how much? 23

14. One of the laws of motion states, “Things in motion stay in motion unless an unbalanced force acts upon it.” When a marble is rolled across the floor, what is the unbalanced force that causes it to slow down and stop? 24

15. Explain why a hailstone falling from 50 m will hurt a lot worse than a hailstone falling from 10 m if it hit you. (Remember, a gravity = 9.8 m/s 2 ) 25

16. Calculate the force needed to accelerate a mass a 3000 kg mass at 6 m/s/s acceleration. (Hint: F=ma) 26

17. Place the following statements in the correct space: 27 -Shows how fast an object is moving - shows direction - shows change in speed -- shows change in direction

18. In an experiment that you drop a ball from different heights to determine how the height affects the speed of the ball, which of the following will not change? – Speed – Velocity – Acceleration 28

19. When doing an experiment with small rolling toys what would be the best lab safety equipment to wear? 29

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