2. In the plastic on wood problem above, once the body begins moving and transit

Question

2. In the plastic on wood problem above, once the body begins moving and transitions into kinetic friction or "sliding" friction, what applied force must be applied to move the body at constant velocity? { The kinetic friction force Ffis constant regardless of speed if the friction coefficient does not change. If the applied force balances the kinetic friction force, then by the 1st law the calculator will move with constant velocity.}

3. In the above plastic on wood friction problems, if an applied force of 7.0 N is now applied, what will be the horizontal acceleration of the body above? {Use the 2nd law and so you need to use Fw = mg to find the mass given the weight...}

4. What applied external force would need to be applied in the above plastic on wood problem friction problems to move the body at a constant horizontal acceleration of 1.6 m/s2?

Explanation / Answer

1) F = u(s)N = 0.5 x 13.3 = 6.65 N

2) F = u(k)N = 0.4 x 13.3 = 5.32 N

3) F-f = ma

a = (7 - 5.32) / (13.3/9.81) = 1.68 / 1.35576

a = 1.24 m/s^2

4) F = f + ma

F = 5.32 + 1.35576*1.6

F = 7.49 N

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