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Motion

Motion. Where does the car have the most potential energy?. Between A and B Between B and C Between C and D After D. Where does the car have more kinetic energy than potential?. A B C D. Describing Motion. Speed = rate at which an object moves (“how fast ”).

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Motion

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  1. Motion

  2. Where does the car have the most potential energy? • Between A and B • Between B and C • Between C and D • After D

  3. Where does the car have more kinetic energy than potential? • A • B • C • D

  4. Describing Motion • Speed = rate at which an object moves (“how fast”)

  5. Describing Motion • Speed = rate at which an object moves (“how fast”) speed equation:speed = distance ÷ time (v = d ÷ t) distance = “how far” object traveled time = “how long” object traveled units of speed:meters per second (m/s) or kilometers per hour (km/hr)

  6. A jogger runs the first 1000 m of a race in 250 sec. What is the jogger’s speed?What is the correct way to plug in the numbers? • v = 250 sec ÷ 1000 m • v = 1000 m ÷ 250 sec • v = 1000 m x 250 sec • v = 250 sec x 1000 m

  7. Describing Motion • Speed = rate at which an object moves speed = distance ÷ time (v = d ÷ t) A jogger runs the first 1000 m of a race in 250 sec. What is the jogger’s speed? v = 1000 m ÷ 250 sec

  8. A jogger runs the first 1000 m of a race in 250 sec. What is the jogger’s speed? • v = 0.25 m/sec • v = 0.25 sec/m • v = 4 m/sec • v = 4 sec/m

  9. Describing Motion • Speed = rate at which an object moves speed = distance ÷ time (v = d ÷ t) A jogger runs the first 1000 m of a race in 250 sec. What is the jogger’s speed? v = 1000 m ÷ 250 sec v = 4 m/sec

  10. Distance-Time Graphs • Distance-Time Graphs = used to represent a person or object’s motion

  11. How long had both boys been running before they met? • 4 sec • 2.7 sec • 27 yards • 20 yards

  12. How far did the red boy run before he met the blue boy? • 40 yards • 27 yards • 2.7 sec • 20 yards

  13. What was the blue boy’s speed? • 20 yards • 5 yds/sec • 20 yds/sec • 10 yds/sec

  14. Describing Motion • Speed = rate at which an object moves • Velocity = speed with a specific direction

  15. A running back moves towards the east end zone at 10 m/sec. What is the running back’s velocity? • 10 m/sec • 10 m/sec west • 10 m/sec east • 10 meters east

  16. Describing Motion • Speed = rate at which an object moves • Velocity = speed with a specific direction • Acceleration = change in velocity over time

  17. Describing Motion • Acceleration = change in velocity over time • Acceleration can mean: • Speeding up = positive (+) acceleration

  18. Describing Motion • Acceleration = change in velocity • Acceleration can mean: • Speeding up = positive (+)acceleration • Slowing down = negative (-) acceleration

  19. Describing Motion • Acceleration = change in velocity • Acceleration can mean: • Speeding up = positive (+)acceleration • Slowing down=negative (-)acceleration • Changing direction • Think of a rollercoaster because it can do all three!

  20. Which car is not accelerating? • A car driving up a hill and down the other side. • A car turning a corner. • A car turning a corner at a constant speed. • A car driving at a constant speed along a straight highway.

  21. Which is NOT an example of acceleration? • As you see your friend, you jump up and run to greet them. • Your dog runs in circles chasing his tail. • You pedal your bike along your street at 5 km/hr. • A car slows down as it comes to a red light.

  22. Describing Motion • Acceleration = change in velocity over time acceleration equation: acceleration = velocity ÷ time (a = v ÷ t) units of acceleration: m/s per second (m/s2) or km/hr per hour (km/hr2)

  23. You’re running late, so you accelerate from 0 to 72 km/hr in 8 sec. What is your acceleration?What is the correct way to plug in the numbers? • a = 72 km ÷ 8 sec • a = 0 km/hr ÷ 8 sec • a = 72 km/hr ÷ 8 sec • a = 8 sec ÷ 72 km/hr

  24. Describing Motion • Acceleration = change in velocity acceleration = velocity ÷ time (a = v ÷ t) You’re running late, so you accelerate from 0 to 72 km/hr in 8 sec. What is your acceleration? a = 72 km/hr ÷ 8 sec.

  25. You’re running late, so you accelerate from 0 to 72 km/hr in 8 sec.What is your acceleration? • 9 km/hr • 9 km/hr/sec • 9 km/hr/hr • 9 km

  26. Describing Motion • Acceleration = change in velocity acceleration = velocity ÷ time (a = v ÷ t) A car accelerates from 0 to 72 km/hr in 8 sec. What is the car’s acceleration? a = 72 km/hr ÷ 8 sec. a = 9 km/hr/s

  27. You see a police car and slow down from 72 km/hr to 62 km/hr in 2 sec. What is your acceleration?What is the correct way to plug in the numbers? • a = 72 km ÷ 2 sec • a = 10 km/hr ÷ 2 sec • a = -10 km/hr ÷ 2 sec • a = 62 km/hr ÷ 2 sec

  28. Describing Motion • Acceleration = change in velocity acceleration = velocity ÷ time (a = v ÷ t) You see a police car and slow down from 72 km/hr to 62 km/hr in 2 sec. What is your acceleration? a = -10 km/hr ÷ 2 sec.

  29. You see a police car and slow down from 72 km/hr to 62 km/hr in 2 sec.What is your acceleration? • -5 km/hr • -5 km/hr/sec • 5 km/hr/sec • 0.5 km/hr/sec

  30. Describing Motion • Acceleration = change in velocity acceleration = velocity ÷ time (a = v ÷ t) You see a police car and slow down from 72 km/hr to 62 km/hr in 2 sec. What is your acceleration? a = -10 km/hr ÷ 2 sec. a = -5 km/hr/s

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