Question

Two workers are sliding 390 kg crate across the floor. One worker pushes forward on the crate with a force of 440 N while the other pulls in the same direction with a force of 240 N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a constant speed. What is the crate's coefficient of kinetic friction on the floor? 

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  • Which of the following statements about friction is not true? *       A. An object of large mass is pulled down onto a surface with a greater force than an object of low mass and, as a consequence, experiences a greater friction       B. The direction of friction is always opposite to the direction of motion       C. Friction is a force       D. The direction of friction is always the same as the direction of motion
    A cart of mass mA = 7.3 kg is pushed forward by a horizontal force F. A block of mass mB = 0.54 kg is in turn pushed forward by the cart. If the cart and the block accelerate forward fast enough, the friction force between the block and the cart would keep the block suspended above the floor without falling down. Given g = 9.8 m/s2 and the static friction coefficient μs = 0.8 between the block and the cart; the floor is horizontal and there is no friction between the cart and the floor. Calculate the minimal force F on the cart that would keep the block from falling down.
    A block moving to the right on a level surface with friction is pulled by an increasing horizontal force also directed to the right. As the applied force increases, which of the following is true of the normal force (N) and the frictional force (f) on the block?  a N: remains constant;  f: decreases  b N: remains constant;  f: increases  c N: remains constant;  f: remains constant  d N: increases;  f: increases  e N: increases;  f: remains constant
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