Question

A stone with mass M is thrown straight up. At the top of it trajectory, the net FORCE acting on it is:

A) greater than its weight (>mg)

B) greater than zero, but less than its weight (>mg)

C) momentarily equal to zero

D) always equal to its weight (=mg)

A block of mass slides down a frictionless plane inclined at an angle θ with the horizontal. The full weight of the block is a vector pointing in which direction?

A) parallel to the plane and down the incline

B) parallel to the plane and up the incline

C) perpendicular to the surface of the plane and downward

D) straight downward toward the center of the Earth

Answer 1