HW 4-3-solutions

HW 4-3-solutions - madrid(tmm2353 HW 4-3 Antoniewicz(56445...

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madrid (tmm2353) – HW 4-3 – Antoniewicz – (56445) 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001(part1of4)2.0points When you apply a horizontal force of 80 N to a block, the block moves across the floor at a constant speed ( μ k = μ s ). What happens if instead you apply a force of 60 N? 1. The block will not move. correct 2. The block will start to move, but its speed will decrease. 3. The box will accelerate, but slowly. 4. The block will move at a slower constant speed. Explanation: The force is less than the maximum force of static friction. This implies that the block remains at rest. 002(part2of4)2.0points When you apply a force of 60 N, what is the magnitude of the horizontal component of the force that the floor exerts on the block? Correct answer: 60 N. Explanation: Since the block isn’t moving (static), the forward force on the block must be nulled out by the force on the block by the floor. Thus, the floor exerts a horizontal force of magnitude 60 N. 003(part3of4)2.0points What happens if instead you exert a force of 100 N? 1. The box will continue to sit still. 2. The box will move at a larger constant speed. 3. The box will accelerate. correct 4. The box will start to move, but will even- tually slow down. Explanation: In this case the block will accelerate at a constant rate: a = F applied F max , friction M . 004(part4of4)2.0points When you apply a force of 100 N, what is the magnitude of the horizontal component of the force that the floor exerts on the block? Correct answer: 80 N. Explanation: In this case the horizontal component of the force the floor exerts is 80 N, since this is the maximum force of kinetic friction it can exert.

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