(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A toy duck waddles across the floor at constant speed.

1) How do the magnitubes of Fapplied and Ffriction compare?

2) If the coefficient of friction is 0.15, what is the maximum forward accelereation the duck can give itself?

2. Relevant equations

Ff = coefficient of friction x Normal Force

Fnet = ma

Fg = mg

Kinematics equations:

v2^2 = V1^2 + 2ad

V2 = V1 +at

3. The attempt at a solution

1) There are two answers i have considered. The first is that there is no applied force done to the object, because the duck is moving of its own accord. The second is that the applied force is equal to the force spent in winding up the duck and that that force is larger than the force of friction.

2)

I tried substituting 10 kg for the m.

So, Fg = 9.8 x 10 =98N

Then, Fn = 98N

So Ff = 98 x 0.15 = 14.7N

Fnet = ma

14.7 = 10 x a

a = 1.47 m/s^2.

This is the same as the textbook answer, but i'm not sure if i went about it the right way, nor am i sure about how this answer is right algebraically. Should Ff be equal to Fnet?

Thanks for the help :)

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# Homework Help: FBD, Fapplied and Ffriction?

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