Physics Question

Note: This week you will need a stopwatch. This can be either your phone, a physical stopwatch, or an online one. If you need an online one, simply Google “stopwatch” as Google has one built in to its site.

Motion

1. Select the tab labelled “Motion.”
2. Play around with the simulation to get familiar with it.
   • Investigate and click around making sure you try everything out.
3. Reset via the yellow reset button on the right side of the screen.
4. Turn on “Speed.”
5. At the same time, start your stopwatch and press the +50N button once.
6. Stop your stopwatch when the speedometer maxes out.
   • Question 1: Describe the motion of the crate on the skateboard.
   • Question 2: How long did it take to reach maximum speed?
7. Reset, and turn “Speed” back on.
8. At the same time, start your stopwatch and press the +50N button twice.
9. Stop your stopwatch when the speedometer maxes out.
   • Question 3: Compare the observed motion to your answer in Question 1: what changed? Why?
   • Question 4: How long did it take to reach maximum speed?
10. Reset, and turn “Speed” back on.
11. Stack any other item on top of the crate.
    • Question 5: What item did you pick? Why?
12. At the same time, start your stopwatch and press the +50N button once.
13. Stop your stopwatch when the speedometer maxes out.
    • Question 6: Compare the observed motion to your answer in Question 1: what changed? Why?
    • Question 7: How long did it take to reach maximum speed?
    • Question 8: By comparing your answers between questions 1, 3, and 6, are there any rules that you can suggest for the relationship between mass, force, and acceleration?
    • Question 9: Which of Newton’s laws did we investigate via this experiment?

Friction

1. Switch to the tab labelled “Friction.”
2. Turn on both “Speed” and “Values.”
3. Press the +50N button once and observe the values of the applied and friction forces, then press the +50N button a second time and continue observing the values of the applied and friction forces.
   • Question 10: What is the acceleration of the box? Why? How do the applied and friction forces compare?
4. At the same time, start your stopwatch and press the +50N button a third time.
5. Stop your stopwatch when the speedometer maxes out.
   • Question 11: What happened to the value of the friction force? Why?
   • Question 12: What is the new net force felt by the box?
   • Question 13: How long did it take to reach maximum speed? How does this amount of time compare to the time found in question 2? Does this difference make sense?

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