Week 03 Handout

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New Jersey City University *

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130

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Physics

Date

Jan 9, 2024

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8

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Name_____________________________ Date_______ Week 03 LGM 1 Need to Know Thoughts: Activity 3.1.1 Describe how each of the cars is moving. Blue Car Yellow Car Green Car Construct a motion diagram for the blue car. Construct a motion diagram for the yellow car. Construct a motion diagram for the green car.
Name_____________________________ Date_______ Describe any changes or additions we could make to our motion diagrams to make them easier to read. Time for Telling Activity 3.1.2 Identify the Δ ⃗ v in each of the scenarios below: 1) 2) 3) 4) In the four incomplete motion diagrams below, identify whether each object is speeding up or slowing down and whether its ⃗ v and Δ ⃗ v are positive or negative . Time for Telling
Name_____________________________ Date_______ Activity 3.1.3 Describe in as much detail as you can what is happening to the… Position of the volunteer: Velocity of the volunteer: Based on this description, sketch what you think the position-time and velocity-time graphs would look like for this motion. Sketch the actual graphs produced by the motion detector: Do the graphs from the motion detector show the patterns you expected to see?
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Name_____________________________ Date_______ What can we learn about the motion of an object from its velocity-time graph ? Time for Telling
Name_____________________________ Date_______ Week 03 LGM 2 Activity 3.2.1 Xena and Gabrielle are running in a straight line as represented with the velocity-time graphs shown below. Which of the following statements about their positions could be true? a. Xena remains a fixed distance ahead of Gabrielle as they run. b. Xena starts in front of Gabrielle and the distance between them decreases over time. c. Xena starts in front of Gabrielle and the distance between them increases over time. d. Xena and Gabrielle start at the same place and the distance between them increases over time. Your Thoughts Class Discussion Represent Xena’s and Gabrielle’s motions with a position-time graph and a mathematical expression for their position as a function of time . Position-time graph Position-time functions How can we relate these to the velocity-time graph ?
Name_____________________________ Date_______ If this pattern holds for accelerating objects, what would the mathematical expression for the position of an accelerating object look like? We can test this idea using a motion detector: If… and… then… because… and/but… therefore … Time for telling
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Name_____________________________ Date_______ Activity 3.2.2 A person walks at a constant speed of 2 m/s for 3 seconds before accelerating at a rate of -0.5m/s/s. Represent this motion with a motion diagram , a position-time graph , and a velocity-time graph . How far does this person walk before they stop? Notes
Name_____________________________ Date_______ Activity 3.2.3 Make up a story which describes the motion represented by the velocity-time graph below: Where does this person end up at t = 10s relative to where they started? Represent this motion with a motion diagram and a position-time graph .

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