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Lecture #2

# Lecture #2 - Physics 1010Q Lecture 2 Chapter 2 What is...

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Physics 1010Q Lecture # 2 Chapter 2 What is Motion? Earth moves round the sun A player kicks a ball A swimmer swims across the swimming pool. 1. Speed Imagine driving home from school. For simplicity, assume that you can drive home in a straight line. One relationship between space and time can be illustrated by answering the question, How fast were you going? Actually, there are two ways to answer this question: looking at the total trip, and considering the moment-by-moment details of the trip. Average speed is defined as the total distance traveled divided by the time it took to cover this distance. ± ² ³ where S is the average speed, d is the distance traveled, and t is the time taken for the trip. We measure speed as m/sec. Q: Someone rides a bicycle in a straight line and covers a distance of 100 meter (from north- end of the Student Union to the Coop) in 50 seconds. What is the average speed? A: Q: A student rides a bicycle in a straight line at a speed of 10m/sec for 10 seconds, then stops to rest for 10 seconds, then rides in the same direction for 10 seconds more at a speed of 10 m/sec. What is the average speed over the entire 30 seconds interval? Ans:

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Physics 1010Q Problem: Suppose you live 40 km from school and it takes you 2 hours to drive home. What is your average speed during the trip as m/sec A: Problem: What is the average speed of an airplane that flies 3000 km in 6 hours? A: Problem: Someone rides a bicycle in a straight line at a speed of 10 m/sec for 10 seconds, then stops to rest for 10 seconds, then rides in the same direction for 10 seconds at a speed of 10 m/sec. What is the average speed over the entire 30 seconds interval?
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Lecture #2 - Physics 1010Q Lecture 2 Chapter 2 What is...

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