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Warm-Up Monday, November

Draw the image below and write the question. Warm-Up Monday, November. Unbalanced forces are acting on the soccer ball. Which direction will the ball move? Support your reasoning. The ball will move to the left because the “blue” force has more Newtons. What moves you?. Human Ingenuity.

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Warm-Up Monday, November

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  1. Draw the image below and write the question. Warm-Up Monday, November Unbalanced forces are acting on the soccer ball. Which direction will the ball move? Support your reasoning. The ball will move to the left because the “blue” force has more Newtons.

  2. What moves you? Human Ingenuity • MYP Question: • AoI: • IB Learner: • EQ: Knowledgeable, Inquirer • What is the relationship between velocity and acceleration? S8P3. Students will be able to demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction.

  3. Opening Motions of Movement:Acceleration, Speed, Velocity Are you moving? Look around the room, do you see anything/anyone moving?

  4. Is the boy moving? It depends on the reference point.

  5. Reference point - The point from which motion is being observed - The object that appears to stay in place Motion - when an object changes position over time relative to a reference point

  6. Speed • Distance traveled in a unit of time • Speed = Distance ÷ Time Speed Distance Time

  7. Do you move at a constant speed? • Distance traveled during each hour is different. • The distance varies because the speed is not constant.

  8. Practice Speed Problem Speed = distance time Henry drives about 1,120 km from Baltimore, MD to Atlanta, GA. It takes him 14 hours to get there. What is Henry’s speed for the trip? Speed = Distance ÷ Time 1,120 km ÷ 14 hours 80 km/hour

  9. Which car is moving faster? Hint: Find the average speed for each car. What do you notice about the slope of the line when the car is moving faster? Blue Car: 50 ÷ 2 = 25 m/s Red Car: 50 ÷ 5.5 = 9.09 m/s Faster = Steeper Slope

  10. Don’t write this down. Imagine that two birds leave the same tree at thesame time. They both fly at 10 km/h for 5 min,12 km/h for 8 min, and 5 km/h for 10 min. Whydon’t they end up at the same place? The birds went in different directions. Their speeds were the same, but they had different velocities.

  11. Velocity • Speed with a direction • Example: 2 m/s North • V = displacement(distance) time The speeds of these cars may be similar, but the velocities of the cars differ because the cars are going in different directions.

  12. Changing velocity When the direction of a moving object changes, the velocity changes even if the speed stays the same.

  13. Velocity(continued) • Both cars are moving 20 m/s (meters per second). • Both cars have the same speed but they do • not have the same velocity because they are • moving in different directions.

  14. Sample Velocity Problem Vancouver is approximately 225 kilometers north of Seattle. What is the average velocity of a bus traveling directly from Seattle to Vancouver if the trip takes 3 hours? • Velocity= Displacement(distance) ÷ Time • = 225 km North ÷ 3 hours • = 75 km/hr North

  15. Acceleration Don’t confuse Speed with Acceleration! • Rate at which velocity changes • Increasing speed, decreasing speed or changing direction. • Acceleration = change in velocity time

  16. When is the car accelerating (speeding up) anddecelerating(slowing down) ?

  17. How would the graph look?

  18. Sample Acceleration Problem A car leaves a stop sign traveling south and accelerates from 0 m/s to 30 m/s in 10 seconds. What is the rate of acceleration? A = Change in velocity ÷ time = (V2 – V1 ) ÷ time = (30 m/s – 0 m/s) ÷ 10 seconds = 30 m/s ÷ 10 seconds = 3 m/s2

  19. Application: Show your understanding of these concepts by completing the activity sheets. All Students: “Calculating Speed” “Calculating Velocity” In order to receive credit, you MUST show your work. Motion Lab Tomorrow

  20. Closing The following graph gives the distance traveled by a cyclist from his home. What most likely was the cyclist doing between 2 and 3 p.m.?

  21. Acceleration Lab http://content3.jason.org/resource_content/content/digitallab/13865/misc_content/in_motion.html

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