Analyzing Forces: Using Newton's 2nd Law A fireman has a mass of 75 kg. When the bell in the firehouse starts ringing, he slides down the pole with an acceleration of 3 m/s². What is the total force of friction acting on his body? 1. Identify the problem: What quantity are you being asked to find? What units will this answer be in?. 2. Visualize and then sketch the problem. Draw arrows to illustrate the direction of the two forces acting on the fireman. Label these two forces by name. Do not use numbers yet. 3. These two forces act in opposite (+/-) directions and they will partially cancel. Assign the value to the stronger force. The sum of these two forces is called the Net Force and it is the force which will actually move the fireman. Fill in the names of these two forces in the equation template below. (Hint: Remember that mass and weight are not the same.) Do not use numerical values yet: Net Force = + 4. Newton's 2nd Law gives us another equation for calculating Net Force: Net Force = You know these values. Use them to solve for Net Force (show calculation): Net Force = 5. Study these two equations and use them to solve for the force of friction acting on the fireman. Show calculations:

Analyzing Forces: Using Newton's 2nd Law A fireman has a mass of 75 kg. When the bell in the firehouse starts ringing, he slides down the pole with an acceleration of 3 m/s². What is the total force of friction acting on his body? 1. Identify the problem: What quantity are you being asked to find? What units will this answer be in?. 2. Visualize and then sketch the problem. Draw arrows to illustrate the direction of the two forces acting on the fireman. Label these two forces by name. Do not use numbers yet. 3. These two forces act in opposite (+/-) directions and they will partially cancel. Assign the value to the stronger force. The sum of these two forces is called the Net Force and it is the force which will actually move the fireman. Fill in the names of these two forces in the equation template below. (Hint: Remember that mass and weight are not the same.) Do not use numerical values yet: Net Force = + 4. Newton's 2nd Law gives us another equation for calculating Net Force: Net Force = You know these values. Use them to solve for Net Force (show calculation): Net Force = 5. Study these two equations and use them to solve for the force of friction acting on the fireman. Show calculations:

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”

Question

Analyzing Forces: Using Newton's 2nd Law
A fireman has a mass of 75 kg. When the bell in the firehouse starts ringing, he slides
down the pole with an acceleration of 3 m/s². What is the total force of friction acting on
his body?
1. Identify the problem: What quantity are you being asked to find?
What units will this answer be in?
2. Visualize and then sketch the problem.
Draw arrows to illustrate the direction
of the two forces acting on the fireman.
Label these two forces by name.
Do not use numbers yet.
3. These two forces act in opposite (+/-)
directions and they will partially cancel.
Assign the + value to the stronger force.
The sum of these two forces is called the
Net Force and it is the force which will actually
move the fireman.
Fill in the names of these two forces in the
equation template below. (Hint: Remember that mass and weight are not the same.)
Do not use numerical values yet:
Net Force = +
4. Newton's 2nd Law gives us another equation for calculating Net Force:
Net Force =
You know these values. Use them to solve for Net Force (show calculation):
Net Force =
5. Study these two equations and use them to solve for the force of friction acting on
the fireman. Show calculations:

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