PHY 150 - 5-2 Project Two - Logan Mayer

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Southern New Hampshire University *

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150

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Mechanical Engineering

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Apr 3, 2024

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docx

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A&L ENGINEERING Case Material Evaluation Report Newton’s Laws of Motion Newton’s Three Laws of Motion are: 1. An object at rest will remain at rest, and an object in motion will remain in motion unless acted upon from an external force. 2. The force acting on the object is equal to the mass of the object times its acceleration. 3. When an object exerts force upon another object, that object has an equal reaction. Force Diagrams The chosen drop height is 1.5m.
Velocity Calculations Tip : To begin, think about the drop in two phases: The first phase is from the drop to the moment of first contact with the floor. The second phase is the deceleration at impact. The collision time is the time from first contact with the floor to the instant the phone is momentarily at rest. Phone (No Case) 6.2oz = 0.175kg mgh = 1 2 m v 2 + 0 2 9.8 1.5 = 5.42 0 = 5.42 + 0.01 a a =− 542 m / s 2 Phone (Silicone Case) 6.2oz + 1.7oz = 7.9oz = 0.22kg mgh = 1 2 m v 2 + 0 2 9.8 1.5 = 5.42 0 = 5.42 + 0.05 a a =− 108.4 m / s 2 Phone (Hard Plastic Case) 6.2oz + 1.1oz = 7.3oz = 0.20kg mgh = 1 2 m v 2 + 0 2 9.8 1.5 = 5.42 0 = 5.42 + 0.03 a a =− 180 . 6 m / s 2 Phone (Rubber Case) 6.2oz + 3.2oz = 9.4oz = 0.26kg mgh = 1 2 m v 2 + 0 2 9.8 1.5 = 5.42 0 = 5.42 + 0.08 a a =− 67.7 m / s 2
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