# Force question

I need help with these 2 force questions. My answers have ***** next to them.

1) An object in equilibrium
Choices:
a) does not move.
b) has no forces acting on it.
c) has 0 accelleration. ***************
d) two of the above
e) all of the above

An object in equilibrium has to have a=0. I don't think it's choice A, because an object can move with constant speed and still be in equlibrium. I don't think it's choice b, because the net force equalls 0, but that doesn't mean that no forces are acting on it.

2) The static friction force
Choices:
a) equals the coefficient of static friction times the normal force.
b) is always less than the kinetic friction force.
c) will vary in order to keep the object from moving. ***************
d) depends on the area of contact between the surfaces.
e) is in the direction of motion.

choice B and E are the opposite of the truth. For A i think it's supposed to be less and not equal and i'm not really sure about choice D.

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any has any info they can share???

Tom Mattson
Staff Emeritus