# Sol07 - acting on the crate and it will accelerate Therefore the crate will continually speed up Exercises 8 This is an application of Newton’s

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PHYSICS 103 Chapter 3 -- HW #7 Questions 10. According to Newton’s first law, an object in motion tends to continue moving with a constant velocity. Your head is moving with the velocity of the car before the car stops suddenly. Therefore, if you are not wearing your seat belt, your head continues to move forward and hits the windshield, which has stopped with the rest of the car. 20. Because the crate was moving with a constant velocity, you must have been pushing with a force equal to the force of kinetic friction. When you remove some of the books, the normal force pushing the crate against the floor is decreased, decreasing the force of kinetic friction. If you continue to push with the original force, there will be a net force
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Unformatted text preview: acting on the crate and it will accelerate. Therefore, the crate will continually speed up. Exercises 8. This is an application of Newton’s second law of motion. We start with the basic equation in the form that we have memorized, manipulate it to solve for the unknown variable, and then plug in numbers to obtain our numerical answer. 2 2 6000 N kg m/s 0.1 = 0.1 m/s 60,000 kg kg net net F ma F a m = × = = = 14. This is an application of Newton’s second law of motion. Once again we start with the basic equation. We solve it for the unknown and then plug in the numerical values. 2 2 2 24 N kg m/s 40 = 40 kg 0.6 m/s m/s net net F ma F m a = × = = =...
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## This document was uploaded on 10/29/2011 for the course PHSX 103 at MSU Bozeman.

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