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Name: _____________________________________ Class: _____ Motion 11.2 Speed and Velocity

Name: _____________________________________ Class: _____ Motion 11.2 Speed and Velocity. Chapter 11. What are we going to learn?. Identify types of speed Calculate the speed of an object. Speed.

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Name: _____________________________________ Class: _____ Motion 11.2 Speed and Velocity

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  1. Name: _____________________________________ Class: _____Motion11.2 Speed and Velocity Chapter 11

  2. What are we going to learn? • Identify types of speed • Calculate the speed of an object

  3. Speed • The _________ of the ______________ an object moves to the ______________________ the object moves • 2 types: _____________ and ________________________ Average Speed • _________________________ traveled ____________________ the _________ it takes to travel that distance • _________________________ is computed for the ______________________________ of a trip

  4. _________________ for average speed is: Instantaneous Speed • __________ at which an object is ______________ at a given _________________________ • Instantaneous speed is __________________ at a _____________________________ Speed Graphs • The _________ of a line on a ____________________ _______________________ is ____________

  5. Velocity • Description of both ___________ and ___________________ of motion • _____________ is a ____________ • A __________ in ____________ can be the ___________________ a change in ___________, a change in _______________, or __________

  6. ________________________ velocities _________ by ______________________________ • A __________ on a river heads _________________ ___________ the river. The _____________ is moving _______________ to the river banks, so the _______ does _______ land on the bank __________________ ___________ from the starting location. • The _________________________ of the boat is the ___________________ of the ___________________ plus the ___________________. • The boat starts at Point ____ and heads ___________ Point ____ but ____________ the opposite ________ of the river at Point ____.

  7. A __________ on a river heads __________________ ___________ the river. The ____________ is moving _______________ to the river banks, so the _______ does _______ land on the bank __________________ ____________ from the starting location. • The _________________________ of the boat is the ___________________ of the ___________________ plus the ____________________. • The boat starts at Point ____ and heads ___________ Point ____ but _____________ the opposite ________ of the river at Point ____.

  8. The ________ required for the boat to cross the river from one side to the other side _______________ on the _________________ and the _____________________________________ • If the ____________________ is __________ and the ______________________ is ___________, the ___________________________ could be determined to be _________ using the Pythagorean Theorem (_________________________) • The boat velocity is ____, river velocity is _____, then the resultant velocity is ____ • a = ____ m/s and b = ____ m/s

  9. a2 + b2 = c2 42 + 32 = c2 ____ + ____ = c2 √¯ ____ = c ____= c • The resultant velocity is 5 m/s • The time (t) required for the boat to cross a 60-meter wide river (d) would be dependent upon the boat velocity of 4 m/s (v) • If _______________ then _______________ so t = d / v = (60 m) / (4 m/s) = 15 seconds • It would require 15 seconds to cross the 60-meter wide river

  10. The teacher walks 4 meters East, 2 meters South, 4 meters West, and finally 2 meters North. The entire motion lasted for 24 seconds. • Determine the average speed and the average velocity. Average Speed • To determine average speed: d = _______ meters t = _______ seconds average speed = d/t = ____________ = ________ m/s *

  11. Average Velocity • Average velocity is displacement (speed with change in direction)/time ________________ • The displacement is _____ meters • Average velocity = __________________ • Average velocity = ___________ • The skier moves from A to B to C to D. • Determine the average speed and average velocity of the skier during these 3 minutes. • Remember: Add up the distances for speed Add up the displacements for velocity • Average speed = ____________________ • Average velocity = _____________________

  12. A football coach is pacing back and forth along the sidelines from position A to B to C to D. • What is the coach's average speed and average velocity? • Average speed = ____________________ • Average velocity = _____________________

  13. Questions... • Define speed: ___________________________________________ _____________________________________________ • The SI units for speed are ______________________ • How is instantaneous speed different from average speed? ______________________________________________________________________________________________________________________________________________________________________________ • The equation used for calculating average speed is ______________________________________________________________________________________

  14. True or false? You can determine how fast you were going at the midpoint of a trip by calculating average speed for the entire trip. __________________________________ • A student walked 1.5 km in 25 minutes, and then, realizing he was late, ran the remaining 0.5 km in 5 minutes. Calculate his average speed on the way to school. ___________________________________________________________________________________________________________________________________ • What type of speed does an automobile’s speedometer display? ___________________________________________

  15. The slope of a line on a distance-time graph represents ________________. • How do speed and velocity differ? ______________________________________________________________________________________________________________________________________________________________________________ • Circle the letter of each sentence that describes a change in velocity. a. A moving object gains speed. b. A moving object changes direction. c. A moving object moves in a straight line at a constant speed. d. A moving object slows down.

  16. True or false? If a car travels around a gentle curve on a highway at 60 km/h, the velocity does not change. • How do velocities combine? ___________________________________________________________________________________________________________________________________ • A river flows at a velocity of 3 km/h relative to the riverbank. A boat moves upstream at a velocity of 15 km/h relative to the river. What is the velocity of the boat relative to the riverbank? a. 18 km/h downstream b. 15 km/h upstream c. 12 km/h upstream d. 12 km/h downstream

  17. A person jogs 4.0 km in 32 min, then 2.0 km in 22 min, and finally 1.0 km in 16 min. What is the jogger’s average speed in km/min? _____________________ ___________________________________________ • A train travels 190 km in 3.0 hr, and then 120 km in 2.0 hr. What is its average speed? _______________ ___________________________________________ • A car travels 85 km from point A to point B, then 45 km from B to C. The total trip took 1.5 hr. What was the average speed of the car?___________________ ___________________________________________ • A bicyclist travels for 1.5 hr at an average speed of 32 km/hr. How far does the bicyclist travel in that time? ________________________________________________________________________________________

  18. Draw and label a line showing the slope of a constant high speed (A), constant low speed (B), and varying speed (C) on the graph below.

  19. Does a car’s speedometer show instantaneous speed, average speed, or velocity? Explain. ________________________________________________________________________________________ • Describe an experiment you could perform to determine the average speed of a toy car rolling down an incline. ______________________________________________________________________________________________________________________________________________________________________________ • A plane’s average speed between 2 cities is 600 km/h. If the trip takes 2.5 hours, how far does the plane fly? ________________________________________________________________________________________

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