Physics Sept 12 hw

# Physics Sept 12 hw - Downward because the force of gravity...

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Sean Logan Physics 110 September 11, 2007 4. If you give this book a shove so that it moves across a tabletop, it slows and comes to a stop. How can you explain this observation with Newton’s First Law? The force that acts on the book and makes it stop is friction. 14. How would you determine if two objects have the same inertia? Compare their masses. 18. Two ropes are being used to pull a car from a ditch. Each rope exerts a force of 700N on the car. Is it possible for the sum of these two forces to have a magnitude of 1,000N? Yes, if the two ropes are pulling in the same direction, because the force of both ropes combined (700N+700N=1,400N) equals more that that which is needed to move the car (1,400N>1,000N).

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Sean Logan Physics 110 September 11, 2007 24. You are riding an elevator from the parking garage in the basement to the 10 th floor of an apartment building. As you approach your floor, the elevator begins to slow. What is the direction of the net force on you?
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Unformatted text preview: Downward because the force of gravity downward is stronger at that point then the force of the elevator on you upward. 40. Pat and Chris are pushing identical crates across a rough floor. Pat’s crate is moving at a constant 1m/s while Chris’ is at a constant 2m/s. Compare the net forces on the two crates. Pat’s box has a net force of the mass of the box (X kg) times the acceleration (1m/s → ) or Xkg • 1m/s → . Chris’ box on the other hand has a net force of Xkg • 2m/s. Therefore Chris must exert double the force that Pat must. 44. You find that you must push with a force of 10N to keep a jar of cold cream sliding at a contant speed across your bathroom counter. With the jar t rest, you apply a force of 11N. Is it possible that the jar will stay at rest? Explain. Yes, because the initial force to push the jar may be higher than the overall net force needed to push it....
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## This note was uploaded on 04/21/2008 for the course PSCI 110 taught by Professor Porter during the Fall '07 term at Eastern Michigan University.

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Physics Sept 12 hw - Downward because the force of gravity...

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