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Bell Ringers

Bell Ringers. 1. Which of the following is NOT accelerating? A car slowing to a stop at a stop sign You riding a Ferris Wheel The moon orbiting the Earth A cyclist riding constantly at 2 m/s on a straight path. 2. Which of the following are the units for acceleration?

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Bell Ringers

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  1. Bell Ringers 1. Which of the following is NOTaccelerating? • A car slowing to a stop at a stop sign • You riding a Ferris Wheel • The moon orbiting the Earth • A cyclist riding constantly at 2 m/s on a straight path 2. Which of the following are the units for acceleration? (hint: more than one answer) a) m/s2 b) km/hr/s c) m/s d) miles per hour

  2. Day #2 Graphing

  3. HW Worksheet Answers 1. +7.5 km/hr/sec 2. +10 km/hr/sec 3. +2 m/sec2 4. +70 mi/hr/sec 5. -6.25 m/sec2 6. -2 m/sec2 7. -10 mi/hr/sec 8. +5 mi/hr/sec

  4. Bell Ringer • With a partner draw, the Distance vs. Time and Velocity vs. Time graphs for the buggy. • Did this object accelerate? Why or Why not?

  5. Recall….. Distance Constant Positive velocity Time Velocity Time

  6. Remember the 3 laws of acceleration! Acceleration occurs when an object - Speeds up (+) - Slows down (-) - Changes direction

  7. Graphing Acceleration • Each time interval the object is traveling a greater distance • The object has positive acceleration

  8. Recall….. stopped Distance Distance Constant Positive velocity Time Time 0 velocity Velocity Velocity Time Time

  9. Graphing Acceleration Distance Time Speed up Traveling a greater distance over time Velocity is increasing over time Velocity Time

  10. Graphing Acceleration Distance Time Slow down: Traveling less distance over time Velocity is decreasing over time Velocity Time

  11. 0 0 0

  12. Bell Ringer • What is the acceleration of a skater that starts from a velocity of 2 miles/hr East and reaches a velocity of 10 miles/hr in 25 seconds?

  13. Bell Ringer • What is the acceleration of a skater that starts from a velocity of 10 miles/hr East and slows to a velocity of 3 miles/hr in 15 seconds?

  14. Practice Problem • Describe the motion of the object at each part on the graphs. Distance C B E F D A Time A: + acceleration, speed up D: + acceleration B: not moving E: + constant velocity C: constant + velocity F: - acceleration Velocity Time

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