Suppose you pull a nail at a constant rate using a nail puller as shown in Figure 9.21. Is the nail puller in equilibrium? What if you pull the nail with some acceleration – is the nail puller in equilibrium then? In which case is the force applied to the nail puller larger and why?

Data given in Figure 9.21

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F Free-body diagram N 1₁ = ₁₁ 1 = ro N Fi Fn Fo Fn