Need Help Finishing Newton S Laws Lab

Question Description

LabAssignment 3:  Newton’s Laws

Instructor’s Overview

Newton’s laws of motion are a centralcomponent of our understanding of physics. As we discussed in Module 5, Newton’s laws can be summarized as follows:

  1. Inertia – An object tends to resist changes inits motion.
  2. Relationship between the mass of an object, thenet applied force, and the resulting acceleration – F = m ´ a.
  3. Action-reaction pairs – Forces come in pairs.

In this lab, you will perform experimentsto explore each of the laws of motion.

This activity is based on Lab 5 of theeScience Lab kit.  Although you shouldread all of the content in Lab 5, we will be performing a targeted subset ofthe eScience experiments.

Our lab consists of three maincomponents.  These components aredescribed in detail in the eScience manual (pages 55-61).  Here is a quick overview:

  • In the first part of the lab, you will use a bowlfull of water to understand the concept of inertia.  (eScience Experiment 1)
  • In the second part of the lab, you will recreatea classic physics experiment, the Atwood Machine.  This system consists of a pulley holdinga string with two unequal masses. Experimenting with an Atwood Machine is an excellent way tounderstand Newton’s second law of motion. (eScience Experiment 2, Procedure 1)
  • In the final part of the lab you will create aballoon-powered vehicle to elucidate Newton’s third law of motion.  (eScience Experiment 4)

Note: Record all of your data in the tables that are provided in this document.

Take detailednotes as you perform the experiment and fill out the sections below.  This document serves as your lab report.  Please include detailed descriptions of yourexperimental methods and observations.

Experiment Tips

Newton’sFirst Law – Water in a Bowl

· Irecommend that you perform this experiment outdoors as there most likely willbe some spillage of water.

Newton’sSecond Law – The Atwood Machine

· Priorto determining the mass of the washers, make sure to zero your springscale.  To zero your spring scale, holdit vertically with no mass attach and turn the top screw until the scale reads0 grams.  Refer to the following picture:

Turn thisscrew to zero the spring scale.


[img width=”189″ height=”255″ src=”file:///C:/Users/srarin/AppData/Local/Temp/msohtmlclip1/01/clip_image004.jpg” alt=”Description: SpringScale” v_shapes=”Picture_x0020_4″>

· Youmay want to use the hooks on the pulley to hang your Atwood machine.  I placed mine on a hanger:

[img width=”301″ height=”226″ src=”file:///C:/Users/srarin/AppData/Local/Temp/msohtmlclip1/01/clip_image006.jpg” alt=”Description: Atwood” v_shapes=”Picture_x0020_3″>

Newton’sThird Law – Balloon-Powered Vehicle

· Hereis a picture of my balloon-powered vehicle:

[img width=”287″ height=”211″ src=”file:///C:/Users/srarin/AppData/Local/Temp/msohtmlclip1/01/clip_image008.jpg” alt=”Description: Balloon” v_shapes=”Picture_x0020_2″>

· Toadd mass, I taped washers to the straw.





Material and Methods


Data table for the Atwood Machineexperiment (Experiment 2, Procedure 1):

Height = __ meters

Mass of 15washers = __grams

Mass of 1 washer= __ grams

M1 = __ grams (lighter mass)

M2 = __ grams (heavier mass)

Trial Number

Fall time (sec)

Calculated acceleration (m/s2)












Standard Deviation

Analysis and Discussion

Water Bowl

Atwood Machine

Note: Make sure to show your calculationfor the acceleration.

Balloon-Powered Vehicle

Based on your experimental results,please answer the following questions:

Water Bowl

Explain how your observations of the water demonstrateNewton’s law of inertia.

Draw a free body diagram of your containers of waterfrom the situation in Step 3d (After walking in a straight line at constantspeed, stop abruptly). In your free body diagram, draw arrows for the force ofgravity, the normal force (your hand pushing up on the container), and thestopping force (your hand decelerating the container as you stop.) What is thedirection of the water’s acceleration?

Describe two instances where you feel inertial forcesin a car.

Atwood Machine

Draw a FBD for M1 and M2 in your Atwood machine.  Draw force arrows for the force due to gravityacting on both masses and the force of tension

[img width=”267″ height=”356″ src=”file:///C:/Users/srarin/AppData/Local/Temp/msohtmlclip1/01/clip_image009.jpg” alt=”Description: Atwood_Machine” v_shapes=”Picture_x0020_1″>

Use Newton’s Second Law to write an equation for each massof the Atwood machine.  Solve these twoequations for the acceleration of the system.

Using themasses M1 and M2, use the above expression to calculate the acceleration of thesystem.  How does this value compare toyour experimentally measured acceleration? What factors may cause discrepancies between the two values?

Balloon-Powered Vehicle

Explain what caused the balloon to move in terms ofNewton’s Third Law.

What is the force pair in this experiment? Draw a freebody diagram to represent the (unbalanced) forces on the balloon/strawcombination.

Add some mass to the system by taping some metalwashers to the guide straw and repeat the experiment. How does this change themotion of the assembly? How does this change the free body diagram?



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