The Physics of Everyday Phenomena
8th Edition
ISBN: 9780073513904
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Chapter 1, Problem 18CQ
Impulse is defined as the average force acting on an object multiplied by the time the force acts. If we let I represent impulse, F the average force, and t the time, is I = F/t a correct way of expressing this definition? Explain.
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You have been provided with specifications for case materials in the table below. However, you may also use your own figures for the mass of phones and test case materials. As you use this data, ensure that you have made the necessary SI unit conversions: Test Material Mass Collision TimePhone only (no case) 6.2 oz. 0.01 secondsSilicone 1.7 oz. 0.05 secondsHard Plastic 1.1 oz. 0.03 secondsRubber 3.2 oz. 0.08 seconds As the researcher, you will choose a drop height of between 1 and 2 meters. Using the provided mass of 6.2 oz, or by measuring the mass of a personal cell phone, determine the mass you will be using for your calculations. Remember to add the mass of the case material.
1) Using Newton’s second law, calculate the force of impact for each scenario.
Which is the formula that describes the magnitude of impulse on an object?
A. impulse = mass x acceleration
B. impulse = mass x change in velocity
C. impulse = mass * (velocity)2 x 0.5
D. impulse = mass x velocity
You have been provided with specifications for case materials in the table below. However, you may also use your own figures for the mass of phones and test case materials. As you use this data, ensure that you have made the necessary SI unit conversions: Test Material Mass Collision TimePhone only (no case) 6.2 oz. 0.01 secondsSilicone 1.7 oz. 0.05 secondsHard Plastic 1.1 oz. 0.03 secondsRubber 3.2 oz. 0.08 seconds
As the researcher, you will choose a drop height of between 1 and 2 meters.Using the provided mass of 6.2 oz, or by measuring the mass of a personal cell phone, determine the mass you will be using for your calculations. Remember to add the mass of the case material. Use the information provided in your case specification document to calculate the velocity before impact and deceleration at impact. Remember that deceleration…
Chapter 1 Solutions
The Physics of Everyday Phenomena
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