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# how to ch5 - -Chapter 5 Problem 2-Two horizontal forces act...

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Sheet1 Page 1 ---------------------- Chapter 5, Problem 2 ---------------------- Two horizontal forces act on a 4.0 kg chopping block that can slide over a frictionless kitchen counter, which lies in an xy plan e Answer (Part A) 0i + 0j m/s^2 Answer (Part B) 0i + 4.8j m/s^2 Answer (Part C) 3.25i + 0j m/s^2 How To Solve ~~~~~~~~~~~~~~ Refer to pages: (5.6, 3.6, 3.5) Newton's Second Law ********************** F net = Mass * Acceleration Note: F net (sub x) = Mass * Accleration (sub x) F net (Sub y) = Mass * Accleration (Sub y) F net (sub x) 1) Realize that A (sub x) = --------------- Mass 2) Add the x components and divide by mass to find Accleration Part A X (-6.5 + 6.5) / 4.0 = 0 m/s^2 Y (9.6 + -9.6) / 4.0 = 0 m/s^2 Part B X (6.5 + -6.5) / 4.0 = 0 m/s^2 Y (9.6 + 9.6) / 4.0 = 4.8 m/s^2 Part C X (6.5 + 6.5) / 4.0 = 3.25 m/s^2 Y (9.6 + -9.6) / 4.0 = 0 m/s^2 ---------------------- Chapter 5, Problem 6 ----------------------

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Sheet1 Page 2 While two forces act on it, a particle is to move at the constant velocity = (3.05 m/s) - (-4.40 m/s). One of the forces is 1 = (2.5 3 Answer -2.53i + 6.42j N How To Solve ~~~~~~~~~~~~~~ Refer to pages: (3.5, 3.6, 5.6) F Net is The sum of the forces ******************************** F (1) + F (2) = F net Newtons 2nd Law ***************** F net = Mass * Acceleration 1) Relize that Acceleration is 0 because velocity is constant. Think about it, if you are moving at a constant speed and direction, your moving, not accelerating. Therfore: F net = Mass * Acceleration F net = Mass * 0 F net = 0 2) F net = F (1) + F (2) If one force is (2.53 N)i + (6.42 N)j Then F (1)(subx) = 2.53 + "unknown" = 0 F (1)(suby) = 6.42 + "unknown" = 0 3) Solve algebraicly Answer -2.53i + 6.42j Newtons ----------------------- Chapter 5, Problem 14 ----------------------- A block with a weight of 8.6 N is at rest on a horizontal surface. A 3.3 N upward force is applied to the block by means of an a t Answer 5.3 N How to solve ~~~~~~~~~~~~~~ Refer to pages: (5.6, 5.7, 5.8)
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how to ch5 - -Chapter 5 Problem 2-Two horizontal forces act...

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