# lab 2 - Physics 1AL Introduction POSITION &amp; VELOCITY...

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Physics 1AL Summer Session II 2010 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 waves 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 slowing down? b) Is the object momentarily stationary? c) Is the object speeding up? d) Is the object turning around? e) Is the object moving to the left (i.e. negative x)? f) Is the object moving to the right (i.e. positive x)? g) Is the object moving the fastest?

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Physics 1AL Summer Session II 2010 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 Summer Session II 2010 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

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## This note was uploaded on 09/25/2010 for the course PHYSICS 1A 1al taught by Professor Rafaelski during the Summer '10 term at UCSD.

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lab 2 - Physics 1AL Introduction POSITION &amp; VELOCITY...

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