3.1 Notes, Part B.

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Presentation transcript:

3.1 Notes, Part B

Today’s Objectives Calculate the average speed of an object. Explain the difference between speed and velocity.

Speed Speed = = Distance an object travels per unit of time Distance Distance in meters Time in second Scalar quantity refers to "how fast an object is moving.“ Distance Speed = time d = t

Speed changing

Speed SI unit for speed is m/s

Average speed = total distance traveled divided by total travel time Km/hour Instantaneous speed = speed at a single instant of time Speedometer measures this

Example While on vacation, Lisa traveled a total distance of 440 miles. Her trip took 8 hours. What was her average speed? To compute her average speed, we simply divide the distance of travel by the time of travel.

Velocity Speed and direction Vector quantity refers to "the rate at which an object changes its position.“ I traveled south at 60 mi/h to get to school Velocity changes if… You change speed You change direction

Average velocity Different from average speed

Example 1 Average speed = 0.50 m/s Average velocity = 0 m/s Physics Teacher again, walked 12 m in 24 seconds Displacement = 0 m Average speed = 0.50 m/s Average velocity = 0 m/s

Example 2 Average speed = 140 m/min Avg. velocity = 46.7 m/min, right Cross-country skier again Distance = 420 m Displacement = 140 m, right Average speed = 140 m/min Avg. velocity = 46.7 m/min, right

Example 3 Average speed = 9.5 yds/min Football coach again, Distance = 95 yds Displacement = 55 yds, left Average speed = 9.5 yds/min Avg. velocity = 5.5 yds /min, left

In-class Assignment/Homework Finish 3.1 B Lecture Tutorial