a) If a block on a floor is stationary while a horizontal force acts on it, what

Question

a) If a block on a floor is stationary while a horizontal force acts on it, what kind of frictional force acts on it? b) If a block slides across a floor, what kind of frictional force acts on it? c) Which type of frictional force has an upper limit to its magnitude, as given by a formula? d) If a block slides over a floor because of a horizontally applied force, is the frictional force proportional to that applied force? e) If a falling object reaches terminal speed, which of the following is true about the magnitude of the drag force on it from the air? f) Before an object reaches terminal speed in a long fall, which of the following describes the drag force on the object from the air? g) For a particle moving in uniform circular motion, in what direction does the centripetal force point? h) When a particle is in uniform circular motion, does the particle accelerate along the circular path? i) When a particle is in uniform circular motion, what is the angle between the particle

Explanation / Answer

a)static friction

b)kinetic friction

c)static friction

d)No. It is constant and equal to kinetic friction force.

e)

f)

g)inward

h)no

i)90 degrees.

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