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Unformatted text preview: 9 x If PHYSICS 115 CYCLE 3 WORKSHOP: CHAN GIN G. M 0T I ON IN ONE DIMENSION I. Speeding Up Index Today you will look at another kind of index. Your task is to come up with a speeding up index for cars. You will see pictures of several cars on the next page, and
you need to come up with one number to stand for each car’s speeding up. There is no watch or clock to tell you how long each car has been going. However, all the cars drip oil once a second. (They are‘not very good cars!) The
speedometer reading tells you how fast the car is going when the oil drips. This task is a little harder than before.
' A company always makes its cars speed up in the same way. ' We will not tell you how many companies there are.  You have to decide which cars are iron; the same company.
They may look different! To review: (1) Make a speeding up index for each car. A bigger index means a car speeds up more. (2) Decide how many companies there are. (3) To show the cars that are from the same company, draw a line that connects the cars. Reasoning Questions:
1. Use everyday language to describe the speciﬁc information that the speeding up index tells you about the car’s motion. We 5995M“: 0P U2: ms: CHM N SWEEB oVaz >— WhEX m tarmac Tim—5 tum. ﬂaw. THE 0A2?) mmw. 2. How many car compames are there? How do oulknow? 3u€ mwxasp‘ 6k. 3) NW. Nbatag. 3. It can be easy to confuse ﬁrst with speeding up quickly, or slow with speeding up
slowly. What is the difference? Use the following questions to help sort this out: a)
b)
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d)
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Which car is the fastest? Explain what “fastest” means. ﬂ “egg 77””
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How long will it take the fastest car to speed up by 75 mph? 5 OIL, 042695 0?. $3100le .
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How fast will the slowest car be going 105 alter it starts? 30m h
Comparg “fast” to “speeding up quickly” and “slow” to “speeding up slowly.”
Can a car he going fast and speed up slowly? Can a car be going slow and speed
up quickly? Explian.
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II. Workshop Skills: Representing Motton Several Different Ways / V O (Y
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a) How do you move to create a horizontal line in the positive part of a V + E
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b) Make a motion diagram for this motion. 1 c) Write a mathematical description of this motion. _ (1) Sketch a graph of the corresponding acceleration vs. time. 2 WW2 ' W w TIM: [WP/Uh; a) How do you move to create a straig t—line velocitytime graph that slopes up from zero?
b) Make a motion diagram for this motion.
c) Write a mathematical description of this motion. . d) Sketch a graph of the corresponding acceleration vs. time. h: a) How do you move to create a straightline velocitytime graph that slopes down?
b).3.~~1_VIake a motion diagram for this motion. c) Write a mathematical description of this motion. d) Sketch a graph of the corresponding acceleration vs. time. III. Observational Experiment: Speeding Up In One Dimension 1. Set up to observe the fandriven cart in motion speeding up away from the detector. Run the
experiment and sketch the observed position, velocity and acceleration graphs neatly on a separate
piece of paper. Label the graphs "Speeding Up Steadin " . 2. Model: Explain how the position vs time, velocity vs time, and acceleration vs time graphs relate
to motion that is “speeding up”. 3. What is the relationship between velocitytime graphs and acceleration? Is this relationship
consistent with your analysis in Investigation 11? IV Application Experiment: A tapped bocce ball How can we determine whether the motion of a bocce ball that starts from rest and is then tapped with
many light steady taps as it is rolling down the hallway is constant velocity, constant acceleration or some
other type of motion. In lecture we observed that bean bags dropped in equal time intervals look like this: 1. How will you know from your observations that the ball moved with constant
velocity, constant acceleration or some other type of motion? 2. Represent the tabular data that was measured from the lecture experiment as a
graph, as a verbal statement, as a mathematical statement and as a picture
using a motion diagram. Please use all of the representations before drawing
any conclusions about the motion, exactly as you did last week. 3. Is the motion of a tapped bocce ball rolling down the hallway constant
acceleration or some other type of motion? ...
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 Fall '08
 Brahmia
 Physics, Acceleration, Velocity, 6k, 01w

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