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Newton's Prob Solving

# Newton's Prob Solving - floor to the table with an...

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Newton’s 2 nd Law Problem Exercises: 1. What is your weight in Newtons? 2. If your scale reading on earth is 585 N, what is your mass? What would be your scale reading on the moon if its g is 1.6 m/s 2 3. From the sample problem on page 128, what force would the scale exert when: a. the elevator moves up at a constant speed? b. it slows at 2 m/s 2 while moving upward c. it moves down at a constant speed? 4. A 4500 kg helicopter accelerates upward at 2 m/s 2 . What lift force is exerted by the air on the propellers? 5. The maximum force a grocery sack can withstand and not rip is 250 N. If 20 kg of groceries are lifted from the
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Unformatted text preview: floor to the table with an acceleration of 5 m/s2, will the sack hold? 6. A student stands on a bathroom scale in an elevator at rest on the 64 th floor of the building. The scale reads 836 N. a. As the elevator moves up, the scale reading increases to 936 N, then decreases back to 836 N. Find the acceleration of the elevator. b. As the elevator approaches the 74 th floor, the scale reading drops to 782 N. What is the acceleration of the elevator? c. Describe the changes you would expect in the scale reading as the elevator ride back down....
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