Newton’s First Law of Motion—Inertia

1
Chapter 2

• Newtons First Law of MotionInertia

2
Aristotle and his followers for many centuries
thought Earth was at rest at the center of the
universe because

• a. humans experience no sensation of a moving
  Earth.
• b. Earth rotates about its axis.
• c. Earth moves in a perfect circle.
• d. Earth moves in an elliptical path about the
  Sun.

3
Aristotle and his followers for many centuries
thought Earth was at rest at the center of the
universe because

• a. humans experience no sensation of a moving
  Earth.
• b. Earth rotates about its axis.
• c. Earth moves in a perfect circle.
• d. Earth moves in an elliptical path about the
  Sun.

4
Science greatly advanced when Galileo favored

• a. philosophical discussions over experiment.
• b. experiment over philosophical discussions.
• c. nonmathematical thinking.
• d. None of these.

5
Science greatly advanced when Galileo favored

• a. philosophical discussions over experiment.
• b. experiment over philosophical discussions.
• c. nonmathematical thinking.
• d. None of these.

6
Galileo said that if you rolled a ball along a
level surface it would

• a. soon slow down due to its natural tendency to
  come to rest.
• b. keep rolling without slowing if no friction
  acted upon it.
• c. roll as long as its inertia nudged it along.
• d. soon roll in the opposite direction.

7
Galileo said that if you rolled a ball along a
level surface it would

• a. soon slow down due to its natural tendency to
  come to rest.
• b. keep rolling without slowing if no friction
  acted upon it.
• c. roll as long as its inertia nudged it along.
• d. soon roll in the opposite direction.

8
When Galileo rolled a ball down one incline so
that at the bottom it rolled up another, he found
that the ball rolled

• a. almost to its initial height.
• b. halfway to its original height.
• c. to its original height.
• d. higher than its original height.

9
When Galileo rolled a ball down one incline so
that at the bottom it rolled up another, he found
that the ball rolled

• a. almost to its initial height.
• b. halfway to its original height.
• c. to its original height.
• d. higher than its original height.

10
According to Galileo, inertia is a

• a. force like any other force.
• b. special kind of force.
• c. property of all matter.
• d. concept opposite to force.

11
According to Galileo, inertia is a

• a. force like any other force.
• b. special kind of force.
• c. property of all matter.
• d. concept opposite to force.

12
Which of these is NOT a vector quantity?

• a. Speed
• b. Velocity
• c. Force
• d. All are vector quantities.

13
Which of these is NOT a vector quantity?

• a. Speed
• b. Velocity
• c. Force
• d. All are vector quantities.

14
When dishes remain on a table when you yank away
a tablecloth, youre illustrating

• a. friction.
• b. inertia.
• c. constant motion.
• d. SF 0.

15
When dishes remain on a table when you yank away
a tablecloth, youre illustrating

• a. friction.
• b. inertia.
• c. constant motion.
• d. SF 0.

16
If gravity between the Sun and Earth suddenly
vanished, Earth would continue moving in

• a. a curved path.
• b. an outward spiral path.
• c. an inward spiral path.
• d. a straight-line path.

17
If gravity between the Sun and Earth suddenly
vanished, Earth would continue moving in

• a. a curved path.
• b. an outward spiral path.
• c. an inward spiral path.
• d. a straight-line path.

18
A space probe in remote outer space continues
moving

• a. because some kind of force acts on it.
• b. in a curved path.
• c. even though no force acts on it.
• d. due to gravity.

19
A space probe in remote outer space continues
moving

• a. because some kind of force acts on it.
• b. in a curved path.
• c. even though no force acts on it.
• d. due to gravity.

20
Consider a ball resting in the middle of a
cart. When you quickly jerk the cart forward, the
ball

• a. hits the front of the cart.
• b. hits the back of the cart.
• c. remains in the middle of the cart.
• d. All of these are possible, depending on how
  quickly the cart is pulled.

21
Consider a ball resting in the middle of a
cart. When you quickly jerk the cart forward, the
ball

• a. hits the front of the cart.
• b. hits the back of the cart.
• c. remains in the middle of the cart.
• d. All of these are possible, depending on how
  quickly the cart is pulled.
• Explanation The ball tends to remain at rest,
  and the back of the cart intercepts it, so the
  back of the cart and the ball hit each other.

22
A girl pushes a cart to the left with a 100-N
force. A boy pushes it to the right with a 50-N
force. The net force exerted by the girl and the
boy is

• a. 100 N to the left.
• b. 100 N to the right.
• c. 50 N to the left.
• d. 50 N to the right.

23
A girl pushes a cart to the left with a 100-N
force. A boy pushes it to the right with a 50-N
force. The net force exerted by the girl and the
boy is

• a. 100 N to the left.
• b. 100 N to the right.
• c. 50 N to the left.
• d. 50 N to the right.

24
When a 10-kg block is simultaneously pushed
eastward with a force of 20 N and westward with
15 N, the combination of these forces on the
block is

• a. 35 N west.
• b. 35 N east.
• c. 5 N east.
• d. 5 N west.

25
When a 10-kg block is simultaneously pushed
eastward with a force of 20 N and westward with
15 N, the combination of these forces on the
block is

• a. 35 N west.
• b. 35 N east.
• c. 5 N east.
• d. 5 N west.

26
When a 10-N object is suspended at rest by two
vertical strands of rope, the tension in each
rope is

• a. slightly less than 5 N.
• b. 5 N.
• c. slightly more than 5 N.
• d. 10 N.

27
When a 10-N object is suspended at rest by two
vertical strands of rope, the tension in each
rope is

• a. slightly less than 5 N.
• b. 5 N.
• c. slightly more than 5 N.
• d. 10 N.

28
When sign painters Burl and Paul stand on
opposite ends of a scaffold, the tensions in the
two supporting ropes

• a. are equal.
• b. depend on the relative weights of Burl and
  Paul.
• c. combine to equal zero.
• d. are in equilibrium.

29
When sign painters Burl and Paul stand on
opposite ends of a scaffold, the tensions in the
two supporting ropes

• a. are equal.
• b. depend on the relative weights of Burl and
  Paul.
• c. combine to equal zero.
• d. are in equilibrium.
• Explanation If they have equal weights, then
  tensions in both ropes would be the same. If Burl
  is heavier than Paul, then more weight is
  supported by Burls rope and tension in it is
  greater.

30
If Burl carried Paul piggy-back while standing in
the middle of a scaffold, the tensions in the two
supporting ropes would

• a. cancel to zero.
• b. be equal.
• c. be unequal.
• d. more easily support Burl and Paul.

31
If Burl carried Paul piggy-back while standing in
the middle of a scaffold, the tensions in the two
supporting ropes would

• a. cancel to zero.
• b. be equal.
• c. be unequal.
• d. more easily support Burl and Paul.

32
Burl and Paul have a total weight of 1300 N.
The tensions in the ropes that support the
scaffold they stand on add to 1700 N. The weight
of the scaffold itself must be

• a. 400 N.
• b. 500 N.
• c. 600 N.
• d. 800 N.

33
Burl and Paul have a total weight of 1300 N.
The tensions in the ropes that support the
scaffold they stand on add to 1700 N. The weight
of the scaffold itself must be
a. 400 N. b. 500 N. c. 600 N. d. 800 N.
34
Place a book that weighs 10 N on a table and the
support force on the book is

• a. slightly less than 10 N.
• b. 10 N.
• c. slightly greater than 10 N.
• d. dependent on whether the book is flat or
  stands upright.

35
Place a book that weighs 10 N on a table and the
support force on the book is

• a. slightly less than 10 N.
• b. 10 N.
• c. slightly greater than 10 N.
• d. dependent on whether the book is flat or
  stands upright.

36
The equilibrium rule, SF 0, applies to

• a. objects or systems at rest.
• b. objects or systems in uniform motion in a
  straight line.
• c. Both of these.
• d. Neither of these.

37
The equilibrium rule, SF 0, applies to

• a. objects or systems at rest.
• b. objects or systems in uniform motion in a
  straight line.
• c. Both of these.
• d. Neither of these.

38
The net force on any object in equilibrium is

• a. zero.
• b. 10 meters per second squared.
• c. equal to its weight.
• d. somewhat less than its weight.

39
The net force on any object in equilibrium is

• a. zero.
• b. 10 meters per second squared.
• c. equal to its weight.
• d. somewhat less than its weight.

40
Earth moves about 30 km/s relative to the Sun.
When you jump upward in front of a wall, the wall
doesnt slam into you at 30 km/s. This is because
the wall

• a. has too little gravity to influence you.
• b. moves in an opposite direction to you.
• c. and you are moving at the same horizontal
  speed before, during, and after your jump.
• d. has negligible inertia compared with the Sun.

41
Earth moves about 30 km/s relative to the Sun.
When you jump upward in front of a wall, the wall
doesnt slam into you at 30 km/s. This is because
the wall

• a. has too little gravity to influence you.
• b. moves in an opposite direction to you.
• c. and you are moving at the same horizontal
  speed before, during, and after your jump.
• d. has negligible inertia compared with the Sun.