PHYSICS 114 FINAL EXAM FREQUENTLY TESTED
ACTUAL QUESTIONS WITH CORRECT ANSWERS
Question 1.
The drag force:
ANSWER
1. increases in magnitude as the object's speed increases
2. is opposite in direction to the velocity of the object v×’
Question 2.
Ball A with diameter d and ball B with diameter 2d are dropped from the same height. When the two
balls have the same speed, what is the ratio of the drag force on ball A to the drag force on ball B?
ANSWER
Ball A=1/2CdpAv^2 Ball B=1/2CdpAv^2 Ratio Ball A to Ball B: 1/2Cdp(d)v^2/(pv((2d)^2)/n)=1/
Question 3.
A falling object will reach its terminal speed when the magnitude of the drag force is ______________ to
the magnitude of the weight force.
ANSWER
equal to
Question 4.
The drag force pushes opposite your motion as you ride a bicycle. If you double your speed, what
happens to the magnitude of the drag force?
ANSWER
The drag force goes up by a factor of 4.
Question 5.
Very small organisms, like paramecia or protozoa, moving around in water __________.
, ANSWER
almost immediately come to rest once they stop swimming
Question 6.
Two boxes of mass 6.0 kg and 3.0 kg are pushed across a smooth (frictionless) floor by a 18 N force
that is horizontal to the floor.
a. How many forces are exerted on Box A?
b. How many forces are exerted on box B?
c. Suppose we consider the two boxes as a single box, box C that has a mass of 9.0 kg. What is the
net force on box C?
d. What is the acceleration of box C?
e. Rank the magnitudes of the accelerations of boxes A, B and C.
f. If all the boxes have the same acceleration, what is the magnitude of the force that box A exerts
on box B?
g. What is the magnitude of the force that box B exerts on box A?
ANSWER
a. 4 forces
b. 3 forces
c. 18 N
d. 18/9=2.0 m/s^2
e. A=B=C
f. 18 N-(6.0 kg)(2.0 m/s^2)=6.0 N
g. (3.0 kg)(2.0 m/s^2)
Question 7.
Generally, the ______ in a ______ string or rope ______ the magnitude of the ______ pulling on the end of
the string or rope.
ANSWER
1. tension
2. massless
3. equals
4. force
Question 8.
ACTUAL QUESTIONS WITH CORRECT ANSWERS
Question 1.
The drag force:
ANSWER
1. increases in magnitude as the object's speed increases
2. is opposite in direction to the velocity of the object v×’
Question 2.
Ball A with diameter d and ball B with diameter 2d are dropped from the same height. When the two
balls have the same speed, what is the ratio of the drag force on ball A to the drag force on ball B?
ANSWER
Ball A=1/2CdpAv^2 Ball B=1/2CdpAv^2 Ratio Ball A to Ball B: 1/2Cdp(d)v^2/(pv((2d)^2)/n)=1/
Question 3.
A falling object will reach its terminal speed when the magnitude of the drag force is ______________ to
the magnitude of the weight force.
ANSWER
equal to
Question 4.
The drag force pushes opposite your motion as you ride a bicycle. If you double your speed, what
happens to the magnitude of the drag force?
ANSWER
The drag force goes up by a factor of 4.
Question 5.
Very small organisms, like paramecia or protozoa, moving around in water __________.
, ANSWER
almost immediately come to rest once they stop swimming
Question 6.
Two boxes of mass 6.0 kg and 3.0 kg are pushed across a smooth (frictionless) floor by a 18 N force
that is horizontal to the floor.
a. How many forces are exerted on Box A?
b. How many forces are exerted on box B?
c. Suppose we consider the two boxes as a single box, box C that has a mass of 9.0 kg. What is the
net force on box C?
d. What is the acceleration of box C?
e. Rank the magnitudes of the accelerations of boxes A, B and C.
f. If all the boxes have the same acceleration, what is the magnitude of the force that box A exerts
on box B?
g. What is the magnitude of the force that box B exerts on box A?
ANSWER
a. 4 forces
b. 3 forces
c. 18 N
d. 18/9=2.0 m/s^2
e. A=B=C
f. 18 N-(6.0 kg)(2.0 m/s^2)=6.0 N
g. (3.0 kg)(2.0 m/s^2)
Question 7.
Generally, the ______ in a ______ string or rope ______ the magnitude of the ______ pulling on the end of
the string or rope.
ANSWER
1. tension
2. massless
3. equals
4. force
Question 8.
