Conclusions I
Comment on the difference between the average density and the slope of your plot in procedure 3 and 4.
How are the different? Should they be the same? Which is the better value to use and why do you think
so?
In procedure 3 and 4 you found values for the density and uncertainty of the samples. Remembering that
the material is commonly available and has a distinct color, as shown in the video, identify the material.
Discuss how reducing the uncertainty helped in the identification.
Identify the material of the samples in procedure 5 from the same website. Remember it's a common
material with a distinct color. Explain the anomaly in the data and support your decision on how to handle
it.

Amass m = 74 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius r = 18.4 m and finally a flat straight section at the same height as the center of the loop (18.4 m off the ground). since the mass would not make it around the loop if released from the height of the top of the loop (do you know why? ) it must be released above the top of the loop-the-loop height. (assume the mass never leaves the smooth track at any point on its path.) 1. what is the minimum speed the block must have at the top of the loop to make it around the loop-the-loop without leaving the track? 2. what height above the ground must the mass begin to make it around the loop-the-loop? 3. if the mass has just enough speed to make it around the loop without leaving the track, what will its speed be at the bottom of the loop? 4. if the mass has just enough speed to make it around the loop without leaving the track, what is its speed at the final flat level (18.4 m off the ground)? 5. now a spring with spring constant k = 15600 n/m is used on the final flat surface to stop the mass. how far does the spring compress?