Question

You want to nail a 1.3 kg board onto the wall of a barn. To position the board before nailing, you push it against the wall with a horizontal force F to keep it from sliding to the ground Figure 6-30 (a) If the coefficient of static friction between the board and the wall is 0.85, what is the least force you can apply and still hold the board in place? N (b) What happens to the force of static friction if you push against the wall with a force greater than that found in part (a)? O stays the same O decreases increases

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Answer #1

Solution)

Given, mass= 1.3 kg

Coefficient of static friction, us= 0.85

Part a) Here, F= N = mg/us = 1.3 kg*9.8 /0.85 = 14.98 N (Ans)

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Part b) It remains the same

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Good luck!:)

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