Reconciling common sense with Newton\'s laws sense intuition to reconcile Newton
ID: 2289720 • Letter: R
Question
Reconciling common sense with Newton's laws sense intuition to reconcile Newton's laws with common requires Pwara Most students have, at least sympathize with, the intuition that upward motion make force case the upward rope must the conclusion that the upward force move up we reconcile that intuition with the Newtonian merely equals the downward force? intuition as a reconciliation strategy. In a previous tutorial and in lecture, you earned about Refining more during how reconciled Newton's third law with the intuition that a lighter object we a collision. see ifrvining intuition works here. A. (Work together) consider the child, initially at rest, right when the rope first starts to pull him upward. that motion, is the upward force from the rope greater During iniriation stage ofthe than, less than, or equal to 250 newtons (the child's weight)? 1. What does Newton's second law say about this question? (Hint Is the child accelerating during the initiation ofthe motion?) 2, Does the Newtonian answer here agree with common sense? B. (Work together) Now consider the child's motion after the initiation stage of the motion, once he is already moving. 1. batuitively, if the rope's force remains larger than the child's weight (ike during the constant stage, does the child continue up, or does he slow down, or rise with speed? Briefly explain. 2. Does Newton's second law agree with your answer? Explain. 3. Intuitively, if the rope force became smaller than the child's weight, would the child speed up, slow down, or rise at steady speed? Briefly explain. 4. Does Newton's second law agree with your answer? Explain. University of Maryland Physics Education Research Group, Fall 2004.Explanation / Answer
1) The child was initialy at rest and suddenly started moving up against the gravity due to the application of force of the rope. Yes the force applied by the rope will be greater than the weight of the object.
According to the Newtons second law of motion
Frope- W= ma
2) Yes the Newtonaian answer exaclty match with the common sense
B
1)Yes, the child will continue to speed up according to Newtons second law of motion..
2) yes, Newtons second law of motion exactly with my answer.
Fnet=ma
The acceleration of increase in speed is always in the direction of force.
3) If force on the child is greater than its weight then his speed will slow down.
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