Physics students study a piano being pulled across a room on a rug. They know that when it is at rest, it experiences a gravitational force of 2200 N. When it is being pulled with 1200 N it is sliding across the room in equilibrium, but the students feel like they had to pull harder than 1200 N at first to begin motion. Which best describes the friction acting on the piano?
he static and kinetic frictional forces are equal, so the static frictional force is equal to 1200 N. The kinetic frictional force is greater than the static frictional force, so the kinetic frictional force is greater than 1200 N. The static frictional force is greater than the kinetic frictional force, so the static frictional force is greater than 1200 N. The static and kinetic friction are both equal to the gravitational force of 2200 N
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