Sliding Down a Ramp Force Lab

**50 points**

**Procedure:**

Set up the lab station like the drawing on the board and open logger pro. Put the Force Sensor in Port 1:

1. Hold the Force Meter so that it is straight on to the mass (as shown in the diagram).

2.
Holding very still, hit the collect button on the computer and
collect the F_{hill} on that mass (you’ll know how still you’re holding
when you look at the line on the graph).

3. Use the mouse arrow to highlight at least 100 data points and then hit CTRL-C on the computer to copy those data points onto the computer’s clipboard.

4. Open Excel

5. Paste the 100 data points into Excel and find their average. (In Excel, click on an open field and write the following: =average(a1:ax) (Where “a” is the column name and “x” is the last number in the row series)

6. Return to Logger Pro (the program that runs the Force detector) and click on the DATA bar and select “store latest run”.

7. Change the angle of your book. Go to a steeper angle. Repeat Steps 1-5.

8. Return to Logger Pro and go to a lower angle than you have done so far. Repeat Steps 1-5.

**Data Table:**

1^{st} angle you tried: 2^{nd}
angle you tried:

Average F_{hill}
__________N Average F_{hill}
__________N

3^{rd} angle you tried:

Average F_{hill}
__________N

**Calculations:**

1. Find the following information for each of your three angles

a.
F_{gravity}
(Remember, F_{gravity} = mg and always acts straight down)

b.
F_{N}

c. q of your book

**Questions:**

1.
Finish this statement:
“As angle q
increased, F_{hill} _________” (increased, decreased or stayed the
same)

2.
Finish this statement:
“As angle q
increased, F_{N} _________” (increased, decreased or stayed the same)

3.
Finish this statement:
“As angle q
increased, F_{gravity} _________” (increased, decreased or stayed the
same)

4.
If you were to hold the book at such an angle so that the 500
g mass just barely sat there (it didn’t slide, but was about to slide if you
raised it just a hair’s breath more), what would be true about the relationship
between F_{f} and F_{hill}?

Work Lab

**50 points**

**Purpose:** To determine the amount of work needed to
pull a block up a hill.

**Procedure:**

1. Set up a stack of books and a ramp (as illustrated in the drawing below).

2. The height of the books will NEVER CHANGE. But the ramp will

3. Attach a spring scale to a 200 or 500 g mass and drag it up the hill and record the results in the data table.

**Data:**

__Steepest Hill__ __Second
Steepest Hill__ __Gentle Grade__

Force (Newtons) __________ ________________ _________

Distance (meters) __________ ________________ __________

Work (N-m) __________ ________________ ___________

**Calculations:**

** **Find work
from force and distance. Show your **work**
(ha, ha, a play on words!)

**Questions:**

1. What are the units for Work “broken down” (in other words, don’t use Newtons!)

2. True or False: If you drive up a steep hill to the top of a mountain, it takes the same amount of work as if you drive up a gentle grade (but reach the same height).

3. Would it take the same amount of gasoline to get up a steep grade as a gentle grade? Explain your answer.

4.** **True or False: In order to do work, something must move.

** **

** **

**What is due? **

**Sliding Down a Ramp
Lab: **Data Table, Calculations,
Questions

**Force Lab: **Data table, calculations, questions.

Nice and Neat – Yes, you can staple them together, but
please put them in this order.