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Unformatted text preview: fullwood (tf5349) – QUIZ 5 Newton’s Laws – Catala – (49033) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points A dock worker loading crates on a ship finds that a 20 kg crate, initially at rest on a hori- zontal surface, requires a 68 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 58 N is required to keep it moving with a constant speed. The acceleration of gravity is 9 . 8 m / s 2 . Find the coefficient of static friction be- tween crate and floor. Correct answer: 0 . 346939. Explanation: Given : m = 20 kg and F s = 68 N . Static friction is F s = μ s m g μ s = F s m g = 68 N (20 kg) (9 . 8 m / s 2 ) = . 346939 . 002 (part 2 of 2) 10.0 points Find the coefficient of kinetic friction. Correct answer: 0 . 295918....
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This note was uploaded on 06/10/2010 for the course PHY 100 taught by Professor Pro.kiroshima during the Spring '10 term at Adelphi.
- Spring '10