Posted by Wendy on September 26, 1998 at 13:55:45:
Help I need help with this lab. Here we go:
Uniform Acceleration Lab
We have already learned about different kinematic quantities such as position, velocity, and acceleration. These quanitites are what we use to describe the motion of objects.
In this lab we will investigate the relationship between distance and the time for a ball to roll down an incline. The type of motion in this lab wil involve uniform acceleration.
There are two parts to the lab.
PART ONE:
1. Set up a ramp with an angle of incline at about 10 degrees to the horizontal. The books at the end are to stop the marble when it reaches the bottom.
2. Divide the length of the ramp into 6 equal parts and mark the 6 positions on the ramp with pieces of tape. (We divided our ramp into the distances of 20 cm, 40 cm, 60 cm, 80 cm, 100 cm, and 120 cm.)
3. Use a stopwatch to measure the time it takes the marble to roll down the ramp from each of the six points marked. Use a pencil to release the marble at the top of the ramp so that it isn't given a initial push.
Make a graph of distance vs. average time and answer the following questions.
NOTE - THis graph forms a straight line.
1. What is acceleration?
(I know this one - change in velocity over time)
2. Give specific evidence, from your graph only, that the ball accelerates down the ramp. (Hint: notice the time it takes to cover additional distance)
(I said that it takes longer to cover addtional distance, so it's accelerating)
That was easy, but then comes dum dum dum ... PART TWO!!!
1. Use the same set up in part one except remove the tape marks an place them at 5 cm, 20 cm, 45 cm, and 80 cm.
(IMPORTANT NOTE: The distances we are using are multiples of 5 and the first four perfect squares: 1, 4, 9 and 16. This will give us cerain times when you consider the relationship between distance and acceleration is X-Xo = (1/2)AT^2 Think about it!)
I'm thinking but I don't get it. HELP!!!!
2. Again, measure and record in another data chart the time it takes for the marble to roll down the ramp from the different marks. Do three trials fro each mark, record the times, and find teh average.
3. In another column in your data chart, find the difference in travel between successive average rolling times. In other words, find the difference in times between rolling 5 cm and rolling 20 cm, etc.
Make a graph of distance vs. average time and answer the following questions:
NOTE - This graph forms a CURVE.
1. Give specific evidence, from your graph only, that the ball is increasing in speed as it rolls down the ramp.
(I think because the graph curves.)
2. Why should the differences in time between successive intervals be the same as that time to travel 5 cm? (Hint: Look at the IMPORTANT NOTICE in step one)
I have no idea!!!!!!!!! I am COMPLETELY LOST!!!! HELP!!!!!!!
CONCLUSION:
You have just finished a similar experiment that the famous physicist Galileo did. With it he was able to demonstrate the relationship between distance and the time for a ball to roll down an incline. That is the question before you which you should answer in your conclusion: what is the relationship between distance and the time for a bal to roll down an incline? It is a linear, quadratic, or inverse relationship?
I DON'T KNOW!!!!! I HAVE NO CLUE!!!! I NEED BIG TIME HELP!!!!!
Please help, please please please. I have asked a bunch of people, posted it at other sites, gone to chat rooms and asked, but no one can help me!!!!
It's due in two days!!!! PLEASE HELP!!!! Thanks so much!!!! I will LOVE anyone who posts!!!!!!
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