Question Completion Status:
A person pulls a block across a rough, horizontal surface at a constant speed by applying a force F at an angle $\theta = 30^\circ$ with respect to the surface. The arrows in the
diagram below correctly indicate the directions, but not clearly the magnitudes of the various forces on the block. Which of the following relations among the force
magnitudes W = gravitational force, f = friction, N = Normal force, and F = 400 N must be true?
Normal
$30^\circ$
70 kg
friction
$F = f$ and $N = W$
$F = f$ and $N > W$
$F > f$ and $N < W$
$F < f$ and $N = W$
gravitational
force
400 N
QUESTION 5
Consider two cannonballs, one 1.0 kg and the other 5.0 kg. Compared to the 1.0 kg cannonball, the gravitational force on the 5.0 kg cannonball is
1/5 as great
the same
Five times as great
25 times as great
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