Newton's Laws HW

Julie Payette crew on the International Space Station

PDF versions of pages passed out in class.
Due Wednesday, 1/4/2017
Newton's HW page1
Newton's HW page2 

F=ma WRITE UP

F=ma write up instructions

DUE: Friday 1/6/2017

Your #1 objective: demonstrate that Newton's second Law, F=m*a, is true.

Each person needs to prepare their own report.  

Only one name can appear on what is turned in.  

Each person needs to create/make/design their own tables and graphs.

Design:

• State the objective
• Clearly explain the role of each variable – dependent, independent, constant
• Offer a clearly labeled diagram

Data Collection and Analysis:

• Provide a completed summary data table – use a spreadsheet to make this.  
• Be sure to include uncertainty values.
• Explain how the equation was re-arranged in order to linearize the data.
• Provide a graph of a vs. 1/m – include units and error bars for acceleration.
• Provide captions for your table and graph.
• Be sure to staple your raw data
•  – the multiple data tables with various trials – to what you submit

Evaluation:

• State your result.
• How close was your result to the expected?  
• Does the slope of your line match the pulling force?
• Discuss any sources of error

F=ma (Cart) LAB: directions

Proving F=ma

Remember:  You will keep the pulling force the same for ALL trials.  

You will vary the mass of the cart – use 5 different masses.  

You will run 5 trials for each mass.

• Go to the blog and download the spreadsheet template for the F=ma post.
• Save a copy of this ‘velocity template’ file into the folder that corresponds to your period number.
• Set the sampling rate on the motion detector to 25 samples per second.
• Be sure there is at least 20cm between the motion detector and the cart.
• Be sure that the motion detector can ‘detect’ the cart for the entire duration of the trial.
• After you have run what you think is a successful trial, copy and paste 10 position and time data points from Logger Pro into the excel velocity template.  You should paste over the existing data.
• The slope of the velocity-time graph is the acceleration for that trial.  Put this value in the data table you were provided by the instructor.
• Be sure to fill in the value for the pulling force you are using.
• Be sure to fill in the value for the mass that is being used for the 5 trials.
• Calculate the uncertainty for the acceleration by taking the difference between the max and min value and dividing by two.
• Prepare a summary data table with the following columns:  m (show uncertainty), 1/m (show uncertainty), a (show uncertainty).
• Make a graph of a vs. 1/m.  The slope of this line should equal your pulling force.  You can make your graph with excel or use the graph paper provided

F=ma Processing sheet

F=ma Data Sheet

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