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Physics 1AL - Lab 2

# Physics 1AL - Lab 2 - Physics 1AL Introduction POSITION...

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Physics 1AL POSITION & VELOCITY Fall 2008 1 Introduction The purpose of this lab is to help you become familiar with the use of the computer based data acquisition system running sensors that measure position. In later labs, you will use sensors that measure acceleration, force, temperature, etc. The position sensor works by measuring the time for an ultrasonic pulse (at 50 kHz) emitted by the sensor to reflect from the target and return back to the sensor. The computer is programmed with the speed of ultrasound in air, and from the time and speed, it calculates distance. You will first run the program that operates the sensors to get a feel for some of the features important to getting a good result. You will also learn how to set graphic parameters for your experiment, and to manipulate the graphic options for the best output. From the position measurement, velocity and acceleration can be calculated. This week you will need to describe (in words) a position vs. time and velocity vs. time graphs to your lab partners who will then move a cart on a track to reproduce the exact motion. From the graph, you will deduce the cart’s speed as a function of time. The goal of this work is to help you become familiar with different ways to describe motion. Finally you will study the position, speed and acceleration of a ball tossed into the air. __________________________________________________________________________ Pre-lab Questions: 1. The figure shows a position vs. time graph for a moving object. At which exact lettered point or points: (Please do not include ranges such as “from A to B”) a) Is the object speeding up? b) Is the object moving to the left (i.e. negative x)? c) Is the object slowing down? d) Is the object moving the fastest? e) Is the object turning around?

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Physics 1AL POSITION & VELOCITY Fall 2008 2 2. For these velocity vs. time graphs, draw the acceleration vs. time graphs (to scale, with numbers on the vertical axis). 3. For these acceleration vs. time graphs, draw to scale with correctly numbered axes the velocity vs. time graphs, assuming v o = 0 m/s.
Physics 1AL POSITION & VELOCITY Fall 2008 3 A. Tutorial: Motion Detection with Logger Pro Verify the equipment setup: What you will need for today’s lab: o LabPro (the interface between the sensor and the computer) o A sensor to measure position (motion detector) connected to DIG/SONIC 2 input of the LabPro. o A level, low-friction track o A low-friction wheeled cart The Motion Detector: o The motion detector is used to measure the distance from itself to a target object. o It emits ultrasonic pulses and detects the echo from the target. o The usable range of the detector is between 0.5 and 6 meters. The Lab Pro: The LabPro is an interface that converts signals from the motion detector (or other sensor) to a form that the computer can read. Logger Pro: Logger Pro is the software which controls the interface and displays the results of the motion detector measurements. This exercise will teach you to work with Logger Pro. To open Logger Pro double click on UCSD Macintosh. Then click on Applications . Next click on Logger Pro 3.5 . Then click on Logger Pro.

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