So you move the car forward and then reverse when you realize that the briefcase

ID: 1966731 • Letter: S

Question

So you move the car forward and then reverse when you realize that the briefcase is on the top of the car. Please explain if you can!

a) How does the briefcase's acceleration compare to the car's acceleration. My answer: briefcase's acceleration is equal in magnitude but opposite in direction. (other answers possible: it is 0, it is identical in magnitude & direction, must have slid forward when you started backing up, then backward when slowed down.)

b) Which force/forces produced the briefcase's acceleration. My answer: friction that the car's roof exerts on the briefcase. (other answers possible: no force is necessary, the normal force of the car's roof on the briefcase, the briefcase's weight, friction that the briefcase exerts on the car's roof.)

c) Which of the forces listed below must also exist, according to Newton's 3rd law? My answer: briefcases weight. (other answers possible: frictional force of the briefcase on the car's roof, frictional force of roof on the briefcase, the normal force that the briefcase exerts on the car's roof, normal force of the car's roof on the briefcase, the gravitational force that the briefcase exerts upwards on the Earth.)

Please explain your answer! Thanks.

Explanation / Answer

a) before the Car starts backing up the acceleration of briefcase and car was in same direction , but because the backing of Car starts backing suddenly , the briefcase still had the same older inertia which makes it move forward.

b) Yes, the acceleration of briefcase is caused by frictional force acting between car and briefcase.

c)Frictional force of the briefcase on the car's roof, frictional force of roof on the briefcase, the normal force that the briefcase exerts on the car's roof, normal force of the car's roof on the briefcase, the gravitational force that the briefcase exerts upwards on the Earth(which is also known as the briefcase weight.)

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So you move the car forward and then reverse when you realize that the briefcase

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