Transcript Chapter 6

Chapter 6
Forces and Motion
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1. The table shows the accelerations produced when
different forces act on a 5 kg mass. Assuming that the
pattern in the table continues, use these data to predict
what the acceleration would be when a 100 N force
acts on a 5 kg mass.
A 10 m/s2
B 100 m/s2
C 20 m/s2
D 30 m/s2
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Chapter 6
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1. The table shows the accelerations produced when
different forces act on a 5 kg mass. Assuming that the
pattern in the table continues, use these data to predict
what the acceleration would be when a 100 N force
acts on a 5 kg mass.
A 10 m/s2
B 100 m/s2
C 20 m/s2
D 30 m/s2
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Chapter 6
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2. Friction acting on a rolling ball to eventually bring the
ball to a stop is an example of which of the following?
A an unbalanced force
B gravity
C a balanced force
D momentum
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2. Friction acting on a rolling ball to eventually bring the
ball to a stop is an example of which of the following?
A an unbalanced force
B gravity
C a balanced force
D momentum
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3. A short time after jumping from an airplane, a
skydiver reaches a constant speed. Which of the
following statements about the skydiver is true?
A The skydiver is accelerating toward the ground at 9.8
m/s2.
B An unbalanced force acts on the skydiver.
C No unbalanced forces act on the skydiver.
D Air resistance does not affect the skydiver’s speed.
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3. A short time after jumping from an airplane, a
skydiver reaches a constant speed. Which of the
following statements about the skydiver is true?
A The skydiver is accelerating toward the ground at 9.8
m/s2.
B An unbalanced force acts on the skydiver.
C No unbalanced forces act on the skydiver.
D Air resistance does not affect the skydiver’s speed.
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4. Two objects in motion have different masses. How
does the difference in mass affect the forces needed to
make the objects achieve the same rate of change of
velocity?
A The object that has less mass will require more force
to achieve the same rate of change.
B Force does not affect the rate of change of an object.
C It will take the same amount of force to achieve the
same rate of change for the two objects.
D The object that has greater mass will require more
force to achieve the same rate of change.
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4. Two objects in motion have different masses. How
does the difference in mass affect the forces needed to
make the objects achieve the same rate of change of
velocity?
A The object that has less mass will require more force
to achieve the same rate of change.
B Force does not affect the rate of change of an object.
C It will take the same amount of force to achieve the
same rate of change for the two objects.
D The object that has greater mass will require more
force to achieve the same rate of change.
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F
5. The equation a  m represents Newton’s second
law of motion. Based on this equation, if balanced
forces act on an object, which of the following
outcomes can be expected?
A The object’s acceleration will be negative.
B The object’s acceleration will be zero.
C The object’s mass will decrease.
D The object’s mass will increase.
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F
5. The equation a  m represents Newton’s second
law of motion. Based on this equation, if balanced
forces act on an object, which of the following
outcomes can be expected?
A The object’s acceleration will be negative.
B The object’s acceleration will be zero.
C The object’s mass will decrease.
D The object’s mass will increase.
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F
6. Analyze the equation a  m . If the mass of an object
decreases while a constant force is applied to the
object, what happens to the object’s acceleration?
A The object’s acceleration will increase.
B The object’s acceleration will decrease.
C The object’s acceleration remains unchanged.
D The object’s acceleration is zero.
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F
6. Analyze the equation a  m . If the mass of an object
decreases while a constant force is applied to the
object, what happens to the object’s acceleration?
A The object’s acceleration will increase.
B The object’s acceleration will decrease.
C The object’s acceleration remains unchanged.
D The object’s acceleration is zero.
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7. The illustration summarizes the results of an experiment
that involves dropping a feather and a rock at the same time in
a vacuum chamber. Which of the following is a true statement?
A The rock and the
feather are accelerating
at the same rate.
B The rock and the
feather are subject to
air resistance.
C The rock and the feather are moving with constant
speed.
D The rock and the feather reach the ground at
different times.
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7. The illustration summarizes the results of an experiment
that involves dropping a feather and a rock at the same time in
a vacuum chamber. Which of the following is a true statement?
A The rock and the
feather are accelerating
at the same rate.
B The rock and the
feather are subject to
air resistance.
C The rock and the feather are moving with constant
speed.
D The rock and the feather reach the ground at
different times.
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8. Analyze the illustration. Given that acceleration is the
rate at which velocity changes, what is the rate of
acceleration of the rock?
A 0 m/s2
B 9.8 m/s2
C 14.7 m/s2
D 19.6 m/s2
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8. Analyze the illustration. Given that acceleration is the
rate at which velocity changes, what is the rate of
acceleration of the rock?
A 0 m/s2
B 9.8 m/s2
C 14.7 m/s2
D 19.6 m/s2
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9. What does the magnitude of the gravitational force
between two bodies depend on?
A the velocity of the bodies and the friction between
them
B the size of the bodies and their position relative to
Earth
C the weight of the bodies and how quickly they are
moving
D the mass of the bodies and the distance between
them
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9. What does the magnitude of the gravitational force
between two bodies depend on?
A the velocity of the bodies and the friction between
them
B the size of the bodies and their position relative to
Earth
C the weight of the bodies and how quickly they are
moving
D the mass of the bodies and the distance between
them
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10. An object moving in a straight line with a constant
speed has no unbalanced forces acting on it. How will
the object’s motion change over time?
A The object will gradually slow down and come to a
stop.
B Centripetal force will cause the object to go into a
circular orbit.
C The object’s motion will remain unchanged.
D The object will accelerate and change direction.
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10. An object moving in a straight line with a constant
speed has no unbalanced forces acting on it. How will
the object’s motion change over time?
A The object will gradually slow down and come to a
stop.
B Centripetal force will cause the object to go into a
circular orbit.
C The object’s motion will remain unchanged.
D The object will accelerate and change direction.
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11. In archery, you use a bow to shoot an arrow at a
target. Why must an archer point the arrow a little above
the target in order to hit the target in the center? What
forces are involved?
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11. Answer - Full credit answers should include the
following points:
• The arrow moves in a curved path according to
projectile motion.
• The arrow’s horizontal velocity is constant if you ignore
air resistance.
• The arrow’s vertical velocity increases because gravity
causes it to accelerate downward.
• The archer must aim slightly upwards of the target in
order to compensate for acceleration due to gravity.
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12. Luging is a sport in which a racer slides down an
ice-covered track. Identify the three main forces acting
on the racer and describe whether each one acts to
increase or to decrease the racer’s speed.
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12. Answer - Full credit answers should include the
following points:
• Gravity increases the racer’s speed.
• Drag, or air resistance, decreases the racer’s speed.
• Kinetic friction (between the luge and the ice)
decreases the racer’s speed.
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