lecture11

# Lecture11 - Applications of Newtons Laws(Examples Ropes and tension Example 1 You tie a rope to a tree and you pull on the rope with a force of 100

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Example 1: You tie a rope to a tree and you pull on the rope with a force of 100 N . What is the tension in the rope? The tension in the rope is the force that the rope “feels” across any section of it (or that you would feel if you replaced a piece of the rope). Since you are pulling with a force of 100 N , that is the tension in the rope. Applications of Newton’s Laws (Examples) Ropes and tension Example 2: Two tug-of-war opponents each pull with a force of 100 N on opposite ends of a rope. What is the tension in the rope? This is literally the identical situation to the previous question. The tension is not 200 N !! Whether the other end of the rope is pulled by a person, or pulled by a tree, the tension in the rope is still 100 N !! Example 3: You and a friend can each pull with a force of 20 N. If you want to rip a rope in half, what is the best way? 1) You and your friend each pull on opposite ends of the rope 2) Tie the rope to a tree, and you both pull from the same end 3) It doesn’t matter -- both of the above are equivalent

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## This note was uploaded on 10/21/2010 for the course PHYS 221 taught by Professor Herrera-siklody during the Fall '08 term at Iowa State.

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Lecture11 - Applications of Newtons Laws(Examples Ropes and tension Example 1 You tie a rope to a tree and you pull on the rope with a force of 100

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