Necessary to know it because it is the constant for

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necessary to know it because it is the constant for all the balls taking part of the collision, and so by measuring ( s) , the student has a measure of ( v ). The students can use the same technique to obtain the measurements of V A, V B . After a collision the students will measure the displacements of the two balls. In order to verify V=V A +V B the students can use v t=v A t+v B t or s=s A +s B. Where s, s A ,s B are measured directly. Also students need to remember that when collisions between the steel ball and the glass ball are considered, the masses must be retained to use in the equation: p=p A +p B. In order for the students to perform this experiment they will need a ramp, two steel balls, one glass ball(or one of lesser weight), C- clamp, plumb bob, shelf paper (50 cm x 50 cm), masking tape, meter stick, protractor, and carbon paper( 2 sheets) which should all be provided for by the TA. The student must secure the ramp to the edge of the laboratory table with a C-clamp. Next tape the shelf paper on the floor in front of the ramp so the plumb bob point is near the center-edge of your paper. Align the plumb line so that it points straight down from collision point and mark it, which is considered the dimple. Student will roll a steel ball down the ramp and notes where it strikes the paper. Then place a piece of carbon paper, marking side down, in the center area that the ball hit the paper. Now the student can roll the ball down at least five times, while trying to release the ball the same way all five times. Inspect the impact pattern after all trials are complete and it should look like this: The student should use their best judgment to mark an X in the center of the pattern. Then they should draw a line between the end of the plumb bob and the X. Next measure and the record the length of the line. This line represents ( s) . Circle the pattern and label it ( s ). Next part of the experiment the student will determine
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