# PHYS310 Lab 4 Linear Motion

Lab Exercise

Experiment 4.1: Free Fall

Questions

1. What happened to the washers when you dropped the cup? How fast are they falling relative to the cup?

2. What force is keeping the water from accelerating downward while you hold the cup in place?

3. What forces are no longer present on the water while the cup is falling?

4. You have probably seen videos of astronauts moving in a “weightless” environment. Does this mean that gravity doesn’t exist in space? Explain.

Experiment 4.2: Distance of Free Fall
tavg= _____________

Questions

1. What gives a falling object its acceleration?

2. What was the difference between the noise patterns produced by equally-spaced nuts compared to the second spacing given to you?

3. For the second nut spacing, show that the total distance from the end of string for each nut increases according to the linear kinematics equations.

4. Which of the weights had the highest velocity when hitting the cookie sheet? Calculate this velocity (in m/s) using the kinematics equations.

5. Using the time it took a single hex nut to reach the pan, calculate the height from which it was dropped. Is this accurate compared to your known height?

6. Say you have a very long string and want the hex nuts to hit the ground 1 second apart. Using the kinematics equations, determine the spacing for 5 nuts to hit with equal timing. How much string would you need?

7. Draw approximate plots for the single hex nut’s position, velocity, and acceleration vs. time. Label your axes and include approximate numerical values.

Experiment 4.3: Graphing linear motion

Questions (use Figure 7 to answer the questions below)

1. During which period(s) is the object traveling in a positive direction?

2. During which period(s) is the object traveling in a negative direction?

3. During which period(s) the object at rest?

4. During which period(s) is it traveling at constant velocity?

5. During which period(s) does it experience positive acceleration?

6. During which period(s) does it experience negative acceleration?

7. What are the magnitudes of the above accelerations? Draw a plot of the acceleration vs. time for this object using Figure 7.

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