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Singh - Pitt Physics Tutorials, 1/e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 2 / 12

Due : Monday, January 28, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2
2/10 –/2
Total
2/12 (16.7%)

  • Instructions

    Pitt Physics Tutorials, 1st edition, is a collection of 20 multi-step Physics tutorials that comes from Chandralekha Singh at the University of Pittsburgh. It covers introductory physics topics including mechanics as well as electricity and magnetism. Each topic has a tutorial, and a non-tutorial version of the same question. Some topics also include multiple versions of the question with differing amounts of scaffolding and guidance. Most topics also include "paired problems" - different questions that use the same concepts or principles used in the tutorial.

    Question 1 is a tutorial which breaks a complex problem into subparts and guides students through each step in reasoning. Each multiple choice question in the tutorial has specific feedback for each answer choice.

    Question 2 is a paired problem that allows students to practice the same concepts and principles from the tutorial, with hint buttons on the overall problem-solving strategy.
    This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. 2/10 points  |  Previous Answers SinghPhysTut1 2.T.001. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9 10
1/1 1/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
1/100 2/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100 0/100
Total
2/10
 
Tutorial
Two blocks
(m1 = 5 kg, m2 = 2.5 kg)
 are in contact beside one another on a frictionless table. A constant horizontal force of magnitude
FA = 3 N
 is applied to the larger block as shown.
(a)
Find the magnitude of the force
F1 on 2
 exerted by the larger block on the smaller block.
(b)
Find the magnitude of the force
F2 on 1
 exerted by the smaller block on the larger block.
Part 1 of 15
Before Working Through This Tutorial
Take a couple of minutes to write down your own plan to solve this problem. Then proceed to work through each of the multiple-choice questions provided in this tutorial.
Part 2 of 15
Which one of the following statements is true?
     Correct: Your answer is correct.
Correct. This is a true statement. Since our blocks are on a frictionless table, there is no force of friction resisting the force that is applied to the larger block. Only if there was a force of friction equal to the applied force would the system be in equilibrium. The blocks will accelerate, and our system is not in equilibrium.
Part 3 of 15
Which one of the following statements is true?
     Correct: Your answer is correct.
Correct. This statement is true because the force applied to the blocks, perhaps by someone's hand, is a type of contact force. A contact force only acts on the object it is in contact with (it does not act on objects it is not touching).
Part 4 of 15
Newton's third law, in general, states the following.
"If body A exerts a force on body B (action), then body B exerts a force on body A (reaction) that is equal in magnitude and opposite in direction."
Using Newton's third law, which of the following is the most true about our situation?
    


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2. –/2 points SinghPhysTut1 2.P.002. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/100 0/100
Total
–/2
 
Three blocks
(m1 = 13 kg,
m2 = 8 kg,
m3 = 18 kg)
 are on a frictionless horizontal table (block with mass m2 is in the middle) and connected to each other via massless ropes. A constant horizontal tension force of
TH = 7 N
 pulls the rope that is only connected to mass m1. Find the tension forces (in N) in the ropes connecting m1 to m2 and in the rope connecting m2 to m3. (Enter the magnitudes.)
7 N
13 kg
8 kg
18 kg
Ton m2 = N Ton m3 = N
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