A. A box of mass m is placed on an incline with angle of inclination ? . The box

Question

A.      A box of mass m is placed on an incline with angle of inclination ?. The box does not slide. The magnitude of the frictional force in this case is:

         a. > ?s mg sin ?.           b. > ?s mg cos ?.       c. < ?s mg sin ?.            d. < ?s mg cos ?.

For the next two parts, consider the three figures, a), b) and c). The angles from the horizontal are equal in magnitude in cases b) and c). The magnitudes of the three forces are equal.

               a)                                                 b)                                                   c)

B.      If there is NO friction between the crate and the floor, which case will have the GREATEST acceleration? Ans: ____________

C.     If there IS friction between the crate and the floor, which crate will have the MINIMUM acceleration? Ans: __________

D.      The coefficient of static friction is greater than that for kinetic frIction

         True                                False

F.      The kinetic energy can be positive of negative:        True                 False

G.     The potential energy can be positive of negative:   True                    false

Explanation / Answer

if box doesnt side frictional force is greater than normal force

Ff > us mg cos theta

option B it is

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for second part, figure is needed

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