PSC 2121 Lecture Notes - Lecture 2: Net Force, Kilogram, Tow Truck

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27 Apr 2016
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PHYSICAL SCIENCE PSC2121
REVIEW FOR THE FINAL EXAM
A. PHYSICS
CHAPTER 1
1) A kilogram is a measure of an object's
A) weight.
B) force.
C) mass.
D) gravity.
2) Compared with a 1-kg block of solid iron, a 5-kg block of solid iron has the same
A) mass.
B) volume.
C) weight.
D) all of the above
E) none of the above
3) Compared with the mass of a certain object on Earth, the mass of the same object on the
Moon is
A) less.
B) more.
C) the same.
4) You would have the largest mass of gold if it weighed 1 N on the
A) Moon.
B) Earth.
C) both the same
5) When a 10-kg block is simultaneously pushed toward the east with 20 N and toward the west
with 15 N, the combination of these forces on the block is
A) 5 N west.
B) 5 N east.
C) 35 N east
D) 35 N west.
6) An object is pulled with three forces: one at 20 N to the right, another at 40 N to the right,
and the third at 30 N to the left. The net force is
A) 60 N to the right.
B) 60 N to the left.
C) 30 N to the left.
D) none of the above
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PHYSICAL SCIENCE PSC2121
7) A 50-N object falling in air experiences 50 N of air resistance. The amount of net force on
the falling object is
A) 0 N.
B) 25 N.
C) 50 N.
D) 100 N.
8) Whenever the net force on an object is zero, its acceleration
A) may be zero.
B) is zero.
C) and velocity are the same.
D) none of the above
9) Fido weighs 120 N and carries Trixie who weighs 40 N on her back. The support force on
Fido's feet is
A) 40 N.
B) 120 N.
C) 160 N.
D) more than 160 N.
10) When you stand at rest on a floor, the number of vertical forces acting on you is
A) zero.
B) one.
C) two.
D) three.
E) four.
11) The force of friction on a sliding object is 10 N. The applied force needed to maintain a
constant velocity is
A) more than 10 N.
B) less than 10 N.
C) 10 N.
12) Nellie runs the length of a 100-yard football field in a time of 20 seconds. Her average
running speed is
A) 1/2 yard/s.
B) 5 yards/s.
C) 50 yards/s.
D) not enough information
13) When a ball increases in speed by the same amount each second, its acceleration
A) also increases each second.
B) decreases each second.
C) is constant.
D) varies.
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