# Homework Help: Acceleration vs. Time graph confusion

1. Sep 25, 2016

### Ryan1983

1. The problem statement, all variables and given/known data

This HW is a continuation of the previous lab work we did involving, rings,spring scales and weights. The three hypothesis the groups came to were:
1.The ring will move in the direction of the interaction and will slow down.
2.The ring will move in the direction of the interaction at a constant speed.
3.The ring will move in the direction of the interaction and will speed up.

The H.W. then states:
The three hypotheses correspond, respectively, to velocity in the positive direction with acceleration in the
negative direction, velocity in the positive direction with no acceleration, and velocity in the positive direction
with acceleration in the positive direction. On the blank graphs I have provided on the next three pages,
plot the corresponding velocity-vs-time and position-vs.-time graphs for these three cases (the values I have chosen for the acceleration, initial velocity of 3 cm=s, and initial position of 0 cm do not have any special signi cance; they are just to help you find patterns). For cases 1 and 3, calculate the position values for t= 0:2 s,t=0:4 s,t= 0:6 s,t= 0:8 s,t= 1 s,t= 2 s,and t= 3 s. Use your discretion for the time values you chose for the velocity-vs.-time graph and the case-2 graphs. You'll need a centimeter stick (a ruler).As the yellow squares in the acceleration-vs.-time graphs for cases 1 and 3 illustrate, when you find the area, you always go from the curve to the time-axis.
2. Relevant equations

I understand how to find areas of both the squares and triangles.
3. The attempt at a solution
The first hypothesis deals with the interaction slowing down, so with the acceleration vs. time graph I understand that there would be a decrease in acceleration shown in that graph. However where would I start the data point? At zero? and then trend downward? He states that he choose 3cm but thats not given on the first graph.

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2. Sep 25, 2016

### Simon Bridge

What leads you to think that? (It's not what the hypothesis numbered "1" says.)