Force vs' Acceleration Lab

1
Force vs. Acceleration Lab Mass vs.
Acceleration Lab

• Purpose To prove the formula a F/m, by
  graphing the acceleration of a car carrying
  varying masses under various forces.

2
Force vs. Acceleration Lab Mass vs.
Acceleration Lab
3000g
Ticker tape
Pulley
Make sure you tap the car and see if it goes at a
smooth constant speed. If its too fast make the
friction weight lighter. If it stops before it
hits the pulley, make the friction weight heavier.
Friction Weight
3
Force vs. Acceleration Lab Mass vs.
Acceleration Lab
3000g
Ticker tape
Pulley
Friction Weight
Next, remove a 500g mass from the car and attach
it to the end of the string. Keep your friction
weight on with it.
4
Force vs. Acceleration Lab Mass vs.
Acceleration Lab

• Report Outline
• Title page
• Purpose
• Introduction
• Procedure
• Data
• Analysis and Graphs
• Conclusion

5
Title Page

• An title page should include
• Title of lab
• Name and period
• Date
• Picture (optional)

6
Purpose

• A purpose should explain
• The reason for doing the experiment

7
Introduction

• An introduction should explain
• The theories behind the experiment
• The reasons for your specific procedures
• How you are going to analyze your results
• Your expected results

8
Introduction

• 1. The theories behind the experiment
• What does F ma mean?
• What is a force?

9
Introduction

• 2. The reasons for your specific procedures
• Why did you add a friction weight?
• How are you going to measure F in part I?
• How are you going to measure a?
• What values does the ticker tape timer help you
  measure?
• How are you going to measure m in part II?

10
Introduction

• 3. How you are going to analyze your results
• Describe the graph you make in part I.
• What does the line graph suggest?
• What can you measure with the slope?
• How does your graph help prove F ma?
• How can you check the formula by finding the mass
  off of the graph?

11
Introduction

• 3. How you are going to analyze your results
• Describe the graph you make in part II.
• What does the hyperbola graph suggest?
• How does your graph help prove F ma?
• How can you check the formula by finding the
  force using your data table?

12
Introduction

• 4. Your expected results
• What would a perfect lab look like?
• What would the shape of both graphs be
• What value should you get for m in Part I?
• What value should you get for F in Part II?

13
Procedure

• The Procedure should include
• The steps taken to measure and prepare for the
  analysis of the data.

14
Data

• The Data section should include
• All the measurements and observations made during
  the experiment
• It should be in tables and labeled clearly

15
Analysis

• The Analysis should include
• The calculations used to find the m, a and
  F.
• The graphs used to show the relationship between
  F, m and a.

16
Analysis

• Finding the m, a and F
• In Part I, the graph should be a line
• The slope of the line is the inverse of the mass.
• Mass 1/slope
• Check this value against the real mass in Part I
• Real Mass car 3000g friction weight
• 1000

17
Analysis

• Finding the m, a and F
• In Part II, the graph should be a hyperbola
• To check the F just use your data table,

m
a
18
Analysis
Take each m and a and multiply them and see
if the force is equal to the force used.

• F

m
a
19
Analysis
Take each m and a and multiply them and see
if the force is equal to the force used.

• F

m
a
The force used was the force of 500g
falling. Since 500g is .5kg And the acceleration
of a falling object is 9.81m/s2, Then F
(.5kg)(9.81m/s2) 4.905N You should get this
value over and over for every trial of Part II.
20
Conclusion

• The conclusion
• Repeats the purpose of the lab
• States the important results
• Explains errors

21
Conclusion

• 1. Repeats the purpose of the lab
• Explain what exactly you were trying to measure
  to prove F ma.
• In Part I, how did you measure F, m, and a?
• In Part II, how did you measure F, m, and a?

22
Conclusion

• 2. States the important results
• In Part I, what were the values of F, m, and a
  for each trial?
• Did the F ma formula work for each of the
  trials?
• In Part II, what were the values of F, m, and a
  for each trial?
• Did the F ma formula work for each of the
  trials?

23
Conclusion

• Explain errors
• When using the ticker tape timers, what values
  could have been measured in error?
• What effect did those errors have on the measured
  values?
• What effect did your measurement errors have on
  the verification of Fma?