The image describes a thread with a brass cylinder attached to it on a force table. a. The ring is being pulled toward the clamped pulley by the thread. Explain why the ring is staying near the table's center, rather than moving toward the pulley. b. How hard is the center-post pushing the ring? In what direction is its push?
The image describes a thread with a brass cylinder attached to it on a force table. a. The ring is being pulled toward the clamped pulley by the thread. Explain why the ring is staying near the table's center, rather than moving toward the pulley. b. How hard is the center-post pushing the ring? In what direction is its push?
College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
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Question
The image describes a thread with a brass cylinder attached to it on a force table.
a. The ring is being pulled toward the clamped pulley by the thread. Explain why the ring is staying near the table's center, rather than moving toward the pulley.
b. How hard is the center-post pushing the ring? In what direction is its push?
Transcribed Image Text:If the cylinder pulls the thread down with 0.98 N force, then the thread pulls
the cylinder up with that same strength force. This generalizes into a famous
rule (usually called Newton's 3rd Law): the force applied to object A by subject
B is always exactly the same strength, but in the opposite direction, as the
force applied by subject A to object B. Those two different objects (cylinder
and thread) have opposite perspective of their contact, so those forces are
negatives of each other (only the force which is external to the thread can
move the thread).
The thread also pulls the ring toward the thread's center-it pulls both ends
inward. This situation is described concisely by saying that the thread is
tense-there is tension in the thread-it has been put under tension by the
pulls from cylinder and ring. The thread essentially propagates the force
from the cylinder through its length (and over the pulley!) to the ring.
Note: massive rope can be more complicated.
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