This physics lab is about WORK AND KINETIC ENERGY In this experiment, a glider s

Question

This physics lab is about WORK AND KINETIC ENERGY

In this experiment, a glider starting from rest on an air track is attached to a string. The string is drawn over a pulley with a mass hanger tied to the other end. Work is done by gravity which results in a gain of kinetic energy of the entire system. There is a motion sensor located at the left end of the air track, which is where I got the data on the left side of the picture. I placed my hand on the glider, turn on the fan, wait for 3.4 seconds before letting go of the glider and the glider moves to the right. The glider hits the end of the air track and that's the end of data collection. There is a question in the picture which is question #14.

#14.) The total system (glider + hanger + masses) is moving with a velocity given by the velocity data you exported. Calculate the change in kinetic energy of the system relative to the initial kinetic energy (zero kinetic energy relative to the motion sensor when starting from rest) at each time the velocity was taken. This should be done in excel to be used for a graph requested later.

Below this question in the picture is my attempt.

My question: What will be my new and final data points after the calculations that I showed? Of course, I will not be doing this by hand, I will be doing it on excel, but I’m just showing the calculations for the purpose of showing how I am thinking. In the question, it says, “Calculate the change in kinetic energy of the system relative to the initial kinetic energy (zero kinetic energy relative to the motion sensor when starting from rest) AT EACH TIME THE VELOCITY WAS TAKEN”.

My first set of calculation had initial velocity = 0.07m/s and final velocity = 0.03m/s. Does that mean that my next calculation will use initial velocity = 0.03m/s and final velocity = 0.12m/s?

I’m really confused. Please help. Below is all the information, data collected and illustration of the lab setup that you need to know. If you need any more information, please ask. Thanks!

Data dlected TIme Isl Position 0m, Velocity im 0.47 a15 t 0.47 net ve et go at scnd 5ngpiley 94 0Kinetic energy of the entire system ider He In this experiment, a glider starting from rest on an air track is attached to a string. The string is drawn Over a pulley with a mass hanger tied to the other end. Work is done by gravity which results in a gain of m air tack with Sina u 0.75 Masses o.03 Air track 04E-04 2 2 20tmolicor haoer, masses o 14. The total system (glider + hanger + masses) is moving with a velocity given by the velocity data you exported. Calculate the change in kinetic energy of the system relative to the initial kinetic energy (zero kinetic energy relative to the motion sensor when starting from rest) at each time the velocity was taken. This should be done in excel to be used for a graph requested later. 205 654E-04 047 11 2.aSeer, masses 75 in linete enery0t each time tulain taken s cs 335 Knun Use ir calaahon 85 3.9 x)i = 07 m = 003 m/s 0.57 0.45 10122010245veshon hot uil lve ny nehu inhal ond Gnol Ofter the aa.cAohion deove o.68 113 4.7 1.32 ar track ot sords 1.52 1 15 5.05 5,3

Explanation / Answer

The question appears to be twisted a bit because initial kinetic is obviously zero (The system was at rest initially).So, the question basically asks to calculate kinetic energy at the various data points.So change in KE relative to initial KE is equal to kinetic energy at the point where velocity is taken.So

= Kf - Ki

Ki = 0

K=Kf.

So the gist of the matter is that you just have to calculate kinetic energy at every point taking initial kinetic energy as zero.

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