Under the action of horizontal tension f = 100N, the object with weight g = 500N slides along the horizontal ground at a uniform speed 1. If the horizontal pulling force is suddenly removed, find the sliding friction F when the pulling force is removed 2. If the gravity of the object is increased by 100N, in order to keep the object moving in a uniform and straight line, what is the horizontal tension f '?

1. If the horizontal pulling force is suddenly removed, find the sliding friction F when the pulling force is removed
F = 100N. Because the sliding friction doesn't change
2. If the gravity of the object is increased by 100N, in order to keep the object moving in a uniform and straight line, what is the horizontal tension f '?
F=f=μN=0.2*600N=120N

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