Below are 3 Newton's Second Law problems. You do not need to answer the questions they ask. You only need to do the foll

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Below Are 3 Newton S Second Law Problems You Do Not Need To Answer The Questions They Ask You Only Need To Do The Foll 1 (81.92 KiB) Viewed 33 times

Below are 3 Newton's Second Law problems. You do not need to answer the questions they ask. You only need to do the following: 1. Draw a free body diagram 2. Set up a coordinate system. You must correctly follow our rule to align the net acceleration for the system to be along a single axis (it cannot have an x- and a y-component). 3. Correctly set up Newton's Second Law (sum of the forces) in both the x- and y- direction. Correctly use either sine or cose as appropriate. a. As an example, N-mgy=0 will not earn you as many points as N-mgsinė = 0 ( You do not need to solve for any missing variables. I will only grade the steps outlined above. "Pay close attention to directions" 1. You are helping your friend unload their moving truck. You are starting to get lazy, so you just set the boxes on the ramp down to the ground to let them slide down. You try to do the same with a small chair, but notice that it slides down the ramp much more slowly. Being a budding physicist, you reason that this is because the chair/ramp combination has a larger coefficient of kinetic friction than the boxes/ramp combination. The chair accelerates down the ramp at 0.72. The ramp is at an angle of 31° below the horizontal and the chair has a mass of 13 kg. Find the coefficient of friction between the chair and the ramp. 2. Your physics professor told you that you feel heavier or lighter in an elevator at the beginning or end of your vertical voyage. You want to test if your weight ACTUALLY changes, so you take a bathroom scale with you to the rickety elevator in Elings hall. You hop on at the second floor and step onto the scale before pressing the button to travel down to the first floor. Before the doors close, while the elevator isn't moving. you have a weight of 934 N. As soon as the elevator starts downward, the scale reads 813 N. What is the magnitude of the acceleration of the elevator? 3. Ricky Bobby used to be the best there is at car racing. But then he had an accident and has been scared to go fast ever since. Ricky Bobby goes around a banked curve on a race track at less than ideal speed, so that a friction force between the road and his car tires must keep him from sliding down the bank, toward the center of the track. The curve is banked at an angle of 21° and has a radius of curvature of 155 m. The coefficient of friction between the road and his tires is 0.80 and he takes the curve at a timid 45. Does Ricky slide down the track or does friction keep him at the same height on the curve? (Hint: Solve this problem as if the car does not slide. Comparing the magnitudes of the kinetic friction force and the component of weight parallel to the track will tell you if it slides. This requires MUCH algebra.)