Section 4.3
Interaction Forces
Practice Test
1.
A 75-kg person pushes a 12-kg person in a swing with a force of 3 N. What is the acceleration of the person doing the pushing?
a.
25 m/s
2
b.
0.25 m/s
2
c.
0.04 m/s
2
d.
0.4 m/s
2
Hint
2.
In Figure 4-16c, if the box has a mass of 6.0 kg, what will the normal force of the table on the box be?
a.
110 N
b.
9.8 N
c.
50 N
d.
8.8 N
Hint
3.
In Figure 4-16b, if the box has a mass of 6.0 kg, what will the normal force of the table on the box be?
a.
160 N
b.
8.8 N
c.
50 N
d.
9.8 N
Hint
4.
Newton's third law of motion states that __________.
a.
a force is needed to keep an object moving
b.
all forces come in pairs
c.
objects remain either at rest or continue moving in a straight line with constant speed only if the net force on that object is zero
d.
the acceleration of an object is proportional to the net force exerted on the object
Hint
