SCI403A/404A: Physics | Unit 6 | Lessons 11 and 12: Laboratory: Net Force
Laboratory Instructions
Laboratory: Net Force
Materials
Instructions (this document), Lab Report, Net Force Virtual Lab
Part 1 – Measuring Friction on a Horizontally Moving Object
Setup
1. Open the Net Force Virtual Lab.
2. Keep this lab report open as you do the tutorial and input the data for the ‘dance shoe’ in the table below while you are doing the tutorial.
3. Click View Tutorial, and complete the tutorial to learn how to conduct the lab.
a. Record the data for the mass of the dance shoe in the Data Table on page 2.
b. Record the angle of the ramp where the dance shoe slides down the ramp at a slow constant velocity in the Data Table on page 2.
4. Close the tutorial, and then Begin the Lab.
Procedure
1. Record the mass of the athletic shoe in grams (you will convert the mass to weight in newtons when you do the calculation in Excel)
2. Attach the athletic shoe to a spring scale.
3. Slide the shoe horizontally across the bench at a constant velocity and note the reading on the spring scale. The reading on the spring scale should remain constant when the velocity is constant. (Remember to keep the spring scale and string at an angle of zero degrees). Practice the sliding at a constant rate, not too fast and not too slow. I found it helpful to count slowly from 1 to 4 and after I got that down focused on the readings on the digital scale.
4. Repeat Step 3 two more times and record the average force in the Applied Force column.
5. Place the 100 g mass inside the shoe, weigh the shoe, and record the weight in newtons. Then repeat
Steps 3–4.
6. Repeat Steps 3–5 using 200 g, 300 g and 400 g added weight..
7. Repeat steps 3–6 with the dress dance shoe.
DATA TABLE FOR UNIT 6.11 LAB: NET FORCE – you do not need to submit this data table. It is to help you gather data for the Lab Report.
Shoe alone / 1 / Shoe alone / 1 / Shoe alone / 1
Mass (g) / 2 / Mass (g) / 2 / Mass (g) / 2
3 / 3 / 3
Average Applied Force used for analysis:
Record in Table 1 / Average Applied Force used for analysis:
Record in Table 1 / Average Applied Force used for analysis:
Record in Table 1
Shoe + 100 g / 1 / Shoe + 100 g / 1 / Shoe + 100 g / 1
Mass (g) / 2 / Mass (g) / 2 / Mass (g) / 2
3 / 3 / 3
Average Applied Force used for analysis:
Record in Table 1 / Average Applied Force used for analysis:
Record in Table 1 / Average Applied Force used for analysis:
Record in Table 1
Shoe + 200 g / 1 / Shoe + 200 g / 1 / Shoe + 200 g / 1
Mass (g) / 2 / Mass (g) / 2 / Mass (g) / 2
3 / 3 / 3
Average Applied Force used for analysis:
Record in Table 1 / Average Applied Force used for analysis:
Record in Table 1 / Average Applied Force used for analysis:
Record in Table 1
Shoe + 300 g / 1 / Shoe + 300 g / 1 / Shoe + 300 g / 1
Mass (g) / 2 / Mass (g) / 2 / Mass (g) / 2
3 / 3 / 3
Average Applied Force used for analysis:
Record in Table 1 / Average Applied Force used for analysis:
Record in Table 1 / Average Applied Force used for analysis:
Record in Table 1
Shoe + 400 g / 1 / Shoe + 400 g / 1 / Shoe + 400 g / 1
Mass (g) / 2 / Mass (g) / 2 / Mass (g) / 2
3 / 3 / 3
Average Applied Force used for analysis:
Record in Table 1 / Average Applied Force used for analysis:
Record in Table 1 / Average Applied Force used for analysis:
Record in Table 1
Part 2 – Measuring the Frictional Force on an Object Moving on an Inclined Plane
Procedure
1. Place the athletic shoe on the inclined plane and gradually raise the board to increase the angle of inclination until the shoe slides down the board at a slow, constant velocity.
2. Test it again to make sure that the shoe slides down with the same slow, constant velocity.
3. Repeat Steps 1–4 with the dance shoe and record you angle for analysis in Table 2 of the lab report..
Angle when shoe slides / /Shoe 1 – trial 1
Shoe 1 – trial 2
Shoe 1 – trial 3
Angle used for analysis
Record in Lab Report Table 2
Angle when shoe slides / /
Shoe 2 – trial 1
Shoe 2 – trial 2
Shoe 2 – trial 3
Angle used for analysis
Record in Table 2 Record in Lab Report Table 2
Keep this file open and, in a new tab, open the Semester 1 Unit 6.11 Lab Report and input your data for analysis in Tables 1 and 2. If you need help opening the ‘Lab Report’ in a new tab- click here for the study aid.
© 2011, 2009 K12 Inc. All rights reserved. Page 2 of 2
Copying or distributing without K12’s written consent is prohibited.