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If Total Energy should be constant, because the loss in Potention energy should equal a gain in Kinetic Energy, where does the missing total energy go to ?

Here is my data;

TOTAL ENERGY: MISSING ENERGY:

.1254 .00132

.1236 .00103

.1239 .00106

.11883 .0062

.1241 .00085

.1049 .02007

.12254 .00246

.1189 .00608

.1153 .00961

.1191 .00586

.10509 .0191

To obtain my missing energy I took the highess total energy which is the top of the pattern, .1254 MINUS the other results to obtain my missing energy.

DESCRIPTION: In our lab we used a ball and let it accelerate down a slope that starts high, goes DOWN and back UP with a smaller height and goes back down.

MY question is: If Total Energy should be constant, because the loss in Potention energy should equal a gain in Kinetic Energy, where does the missing total energy go to ?

HERE is some hints that our teacher gave us to get through the question

A) Where is the ball missing the least amount of energy? Why ?

B) How else is the ball using energy ?

C) If friction only creates heat in kinetic mode does friction created heat account for the missing energy ?

D) Is the ball missing more and more energy from one end of the track to the other how can it get energy back once its gone ?

Really hope you can help, if you need further data just let me know I can provide some more including the height from which we drop the ball from, the balls mass, speed and time through photogates from the stop.

Thank you.