Real Time Physics Lab 5 Homework Solution

Unformatted text preview: Real Time Physics: Lab 5: Force, Mass and Acceleration Authors: David Sokoloff, Ronald Thornton & Priscilla Laws Page 5-11 V1.30--7/94 Question 2-2: Are your inertial masses reasonably consistent with your scale masses? Comment: In your experiments, you have seen that the physical quantities force, mass and acceleration are related through Newton's Second Law. In the activity you have just done, you have used this relationship to define inertial mass in terms of standard units of force, length and time. This is a good logical definition of inertial mass. Historically, however, the units of mass, length and time were defined first as standards and the unit of force was defined as a derived unit in terms of these standard units. Thus a newton of force is defined as the force needed to accelerate 1.00 kg at 1.00 mlsl. In the next activity you will examine this definition. Activity-2=-2:1:)oesaForce of 1.0.1'tAppHed10 a 1.0kg Mass Really Cause an Acceleration of 1.0 meter/second/second? You have used mass and force measuring devices that have been provided for you. You can now see if everything makes sense by accelerating one kilogram of mass with a force of about one Newton and seeing if an acceleration of about one meter per second per second results. 1. Set up the ramp, pulley, weighted cart, string, motion detector and force probe as in Activity 1-1. (See page 5-3.) Tape masses to the cart along with the force probe so that the total mass of the cart is 1.0 kg. Be sure that the cable from the force probe doesn't interfere with the motion of the cart, and is out of the way of the motion detector. 2. Open the experiment L5A2-2 (Acceleration with 1.0 N Force) to set up axes to graph velocity, acceleration and force. 3. Calibrate the force probe with a force of 2.94 N (300 gram hanging mass), if it hasn't already been calibrated. (Be SUreto check the spacing and sensitivity of the force probe, as in Activity 1-1 step 6, before you calibrate.) 4. Remember to Zero the force probe with nothing pulling on it before each run. Measure the acceleration that results from an applied force on the force probe of 1 N. Try several times with different hanging masses until you get an applied force of close to 1 N while the cart is accelerating. Recall that you may need to adjust both the hanging and the cart mass to get the same tension when the cart is accelerating. Comment: Be careful! Remember that when the cart is being held at rest the . same hanging mass will exert more applied force on the cart than when it is accelerating. @1993-94P. Laws, D. Sokoloff, R. Thornton Supported by National Science Foundation and the U.S.Dept. of Education (FIPSE) Page 5-12 Real Time Physics: Active Learning Laboratory V1.30--7/94 5. Once you get a good run, use Statistics... on the Analyzemenu to measure the average values of force and acceleration, and record these values in the table below. Also record the hanging mass. Mass of cart (kg) Average applied force (N) Average acceleration(m/s2) Hanging mass (kg) Question 2-3:. How close is your result to the expected value of acceleration--1.0 m/s2?...
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