Chapter5-TakeHomeQuiz

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CUNY College of Staten Island *

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Course

111

Subject

Physics

Date

Dec 6, 2023

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pdf

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4

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NJIT PHYS 111 - Physics 1 Instructor: Matthew Cooper Chapter 5 Take Home Quiz Question 1 A hockey player practices their scoring skills using a special puck which has an accelerometer built into it, as shown in Figure 1. This puck has a mass of .190 kg. Initially, the puck speeds towards the goal at 93 miles per hour after being Figure 1 hit. The accelerometer in the puck measures 1 . 73 × 10 3 m s 2 while interacting with the stick which applies a constant force, and . 588 m s 2 as it travels from the stick to the goal. Several others are also skating around, cutting into the ice with their skates while the player practices. After some time, the accelerometer now measures 1 . 12 × 10 3 m s 2 while interacting with the stick, and 1 . 96 m s 2 during the motion to the goal. The player claims the friction created from others skating slowed down their shots, not fatigue. To determine if this is true, calculate the following: a.) The free-body-diagram of the puck while the hockey stick is applying a constant force b.) The free-body-diagram of the puck after the interaction with the hockey stick. 1
c.) µ k before practice d.) µ k after practice e.) F player before practice f.) F player after practice g.) Was it friction or fatigue? 2
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