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Lab 2 - Kinematics II

Lab 2 - Kinematics II - Physics 7A Kinematics Lab 2 v.8.0...

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Physics 7A Kinematics Lab 2, v.8.0 1 NAME __________________________ PARTNER _____________________________ DATE ________________ GSI ___________________ Lab Day/Time ________ KINEMATICS LAB 2: VELOCITY AND ACCELERATION Introduction In this lab, you will continue to explore motion graphs, this time focusing on velocity and acceleration. The main idea is for you to become comfortable at translating back and forth between graphs and real-life motion, and to understand acceleration at a deep, intuitive level. Even if you found the last lab easy, parts of this lab will challenge you. Particularly hard questions are marked with a star or a double–star. As you know, acceleration is the rate of change of velocity with time. Whenever the velocity changes, there is an acceleration. Equipment First, make sure the “LabPro” (the blue interface box next to the computer) is on. You can find the relevant software on the hard drive. Open the hard drive, double click on 7A_MotionDetector.mbl ”. A position graph should open. Make sure the cart is always at least half a meter away from the detector. The cart should always stay on the track itself. Warm-up activity Let’s start with a simple case of accelerated motion: A cart rolling down a ramp. Set up to graph distance and velocity . Pull down the View Menu, select Graph Layout and choose Two Panes. Double click on the top graph and set it to display " Distance ", for 3 s. Then set the bottom graph to display " Velocity ", also for a time of 3 s. Adjust the vertical axes as you need to. Prop up one end of the track, to make a ramp. The ramp angle should be very small, so that the cart takes a few seconds to roll down the track. Put the detector at the top. Now you’re ready for the experiments. Click on the Collect button at the top of the screen (or just hit the "return" key). When the detector starts clicking, release the cart from rest. Record data only until the cart reaches the bottom of the ramp: these first questions are only about the speeding-up motion as it rolls down. Repeat the experiment, if necessary, until you get nice graphs. Sketch the results on the axes at the top of the next page. In your sketches, smooth out the small bumps.
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Physics 7A Kinematics Lab 2, v.8.0 2 GRAPHS OF SPEEDING-UP MOTION 1. In the previous lab, most position vs. time graphs consisted of straight line segments. In intuitive (common sense) language, explain why the position graph is curved when the velocity changes. 2. What would the above graphs have looked like if the cart’s velocity were constant? Make your sketches here.
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Lab 2 - Kinematics II - Physics 7A Kinematics Lab 2 v.8.0...

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