Calculating Average Speed and Velocity in Motion Problems
This text discusses a scenario where a car travels 100 km from city A to city B, analyzing average speed based on different driving speeds for the two halves of the journey. It also poses questions regarding the implications of time spent at varying speeds and the information given by distance between two objects. Additionally, it examines the velocities of two bears over time, highlighting concepts of average velocity and the nature of positive and negative velocities.
Calculating Average Speed and Velocity in Motion Problems
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Presentation Transcript
Starter 1 (1-D) • A car travels 100 km from city A to city B. If the first half of the distance is driven at 50 km/h and the second half is driven at 100 km/h, what is the average speed of the car? • How would this change if the car spent equal amounts of time at 50 km/h and 100 km/h ? (select any time interval)
1-D motion HW #2 Pg 47 5-6
Pg 47 #5 • Does knowing the distance between two objects give you enough information to locate objects? • No, because a single distance could correspond to a variety of different positions of the objects.
Pg. 47 #6 • A) Bear B has the greater avg. velocity • B) Bear A has the greater velocity at t = 8.0 min. • C) No. The velocity of Bear A has a positive velocity from 0 to 40 s, a negative velocity from 40-50 s, and a positive velocity from 50 to 60 s. • D) No, the velocity for Bear B is never negative.
