Bonnie and Clyde are sliding a kg bank safe across the floor to their getaway car. The safe slides with a constant speed if Clyde pushes from behind with N of force while Bonnie pulls forward on a rope with N of force. What is the safe’s coefficient of kinetic friction on the bank floor?
The coefficient of kinetic friction on the bank floor is
The mass of bank safe is
Force applied by Clyde on safe from behind is
Force applied by Bonnie in forward direction is
Draw free body diagram of the bank safe which will show all forces acting on the bank safe.
is the force applied by Clyde from bank side
is force applied by Bonnie
is force of kinetic friction acting in opposite direction of motion
is coefficient of kinetic friction
is the weight of bank safe, acting vertically downward direction
is normal force acting upward
Use Newton's second law of motion to find the net forces acting on the bank safe.
Net force acting vertical in direction is zero as there is no motion in vertical direction.
Net force acting horizontal in direction is zero as safe slides with constant speed.
Substitute the values,
Thus, the coefficient of kinetic energy on the bank floor is
You're driving along at with your aunt's valuable antiques in the back of your pickup truck when suddenly you see a giant hole in the road ahead of you. Fortunately, your foot is right beside the brake and your reaction time is zero!
a. Can you stop the truck before it falls into the hole?
b. If your answer to part a is yes, can you stop without the antiques sliding and being damaged? Their coefficients of friction are and .
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