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course Phy 121
1:10 pm June 22
Copy the problem below into a text editor or word processor. This form accepts only text so a text editor such as Notepad is fine.
You might prefer for your own reasons to use a word processor (for example the formatting features might help you organize your answer and explanations), but note that formatting will be lost when you submit your work through the form.
If you use a word processor avoid using special characters or symbols, which would require more of your time to create and will not be represented correctly by the form.
As you will see within the first few assignments, there is an easily-learned keyboard-based shorthand that doesn't look quite as pretty as word-processor symbols, but which gets the job done much more efficiently.
You should enter your answers using the text editor or word processor. You will then copy-and-paste it into the box below, and submit.
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Answer the following based on Newton's Second Law:
How much net force is required to accelerate a 12 kg mass at 3 m/s^2?
answer/question/discussion:
F = m * a
F = 12 kg * 3 m/ s ^2
F = 36 N
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What would be the acceleration of a 4 kg mass subject to a net force of 20 Newtons?
answer/question/discussion:
A = Fnet / m
A = 20 N / 4kg
A = 5 m/ s ^2
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If you exert a force of 20 Newtons on a 10-kg object and it accelerates in the direction of your force at 1.5 m/s^2, then how do you know there are other forces acting on the object besides your own?
answer/question/discussion:
a = Fnet / m
a = 20N / 10 kg
a = 2 m/ s ^2
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What is the total of all those forces and in what direction does this total act?
answer/question/discussion:
20 + (-5N) = 15 Newton (Fnet)
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Your instructor is trying to gauge the typical time spent by students on these questions. Please answer the following question as accurately as you can, understanding that your answer will be used only for the stated purpose and has no bearing on your grades:
Approximately how much time did you spend on this question?
15 min
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