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2. The dynamic friction coefficient between the object with mass m and the horizontal plane on the horizontal plane is μ? 2. The dynamic friction coefficient between the object with mass m and the horizontal plane is μ. Under the action of the horizontal constant force F1, the object moves in a straight line at a constant speed on the horizontal plane. Now, if a constant force F2 equal to F1 is applied to the object, what is the maximum value of the combined external force acting on the object in the process of displacement s?
You don't have the direction of constant force F2. Let's discuss it in different situations
The first case: the direction of constant force F2 is opposite to that of F1. We analyze the force on the object: the object is subjected to horizontal constant force F1, friction μ mg, horizontal constant force F2. The resultant force F = F1-F2 - μ mg. From the meaning of the question, we can clearly know that F1 = F2 = μ mg. So f = μ mg. W = FS = - μ mg
The first case: the direction of constant force F2 is the same as that of F1. We analyze the force on the object: the object is subjected to horizontal constant force F1, friction μ mg, horizontal constant force F2. The resultant force F = F1 + F2 - μ mg. From the meaning of the question, we can clearly know that F1 = F2 = μ mg. So f = μ mg. W = FS = μ MGS
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