To practice Problem-Solving Strategy 5.2 Newtons Second Law: Dynamics of Particl

Question

To practice Problem-Solving Strategy 5.2 Newtons Second Law: Dynamics of Particles.

t= ?

To practice Problem-Solving Strategy 5.2 Newton's Second Law: Dynamics of Particles. You want to move a heavy box with mass 30.0 kg ^kg across a carpeted floor. You pull hard on one of the edges of the box at an angle 30? Degree c above the horizontal with a force of magnitude 240 N ^N, causing the box to move horizontally. The force of friction between the moving box and the floor has magnitude 41.5 N ^N . What is the box's acceleration just after it begins to move? A normal walking speed is around 2.0 m/s ^m/s . How much time t t does it take the box to reach this speed if it has the acceleration 5.54m/s2 ^m/s^2 that you calculated above? t= ?

Explanation / Answer

Part A)

Net Force = ma

240(cos 30) - 41.5 = 30(a)

a = 5.54 m/s2

Part B)

Apply vf = vo + at

2 = 0 + (5.54)(t)

t = .361 sec

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