KNS 422 Exam 2 Question and
answers rated A+ 2025/2026
Why does increasing the mass of an object also increase its resultant friction force? - correct answer ✔-
an increase in mass also increases inertia
- an increase in mass also increases its normal contact force
- an increase in mass also increases the interactions between the molecules in contact
Dynamic friction is greater than static friction - correct answer ✔false
Static friction is greater than dynamic friction - correct answer ✔true
If a hand is holding a book flat against a vertical wall with -25 N of force, how much force is being
exerted by the wall in the horizontal direction? Hint: a negative force is directed to the left and a positive
force is directed to the right. - correct answer ✔25 N
The vector sum of all external forces acting on an object is the: - correct answer ✔resultant force
What effect does increasing the normal contact force have on the resultant static friction? - correct
answer ✔the static friction force increases proportionally
Why doesn't surface area affect the friction force? - correct answer ✔with an increase in surface area
there is a decrease in pressure
Consider a game of tug-of-war in which Team A is pulling with forces in the positive direction and Team
B is pulling in the negative direction. Calculate the net force of the game between Team A, if they pull
with 1,055 N, and Team B, if they pull with -1,103 N. - correct answer ✔-48 N
, Forces that do not act along the same line of action but do act through the same point are called
concurrent forces. - correct answer ✔True
Which type of force is perpendicular to the surfaces of the objects in contact? - correct answer
✔Normal contact force
Which type of force is parallel to the surfaces of the objects in contact? - correct answer ✔Friction
Force (dynamic and static)
Friction between surfaces that are not moving relative to each other. - correct answer ✔Static friction
Friction between surfaces that are moving relative to each other. - correct answer ✔Dynamic friction
Forces that act along the same line of action are called: - correct answer ✔Colinear forces
In Newton's Law of Inertia, if the Net Force is zero, what is true about the velocity? - correct answer
✔velocity is constant
If a 15 kg dumbbell is being lowered to the ground at a constant velocity, what is the vertical reaction
force being applied by the hand? - correct answer ✔147 N
What is the relationship between mass and momentum? - correct answer ✔the larger a mass, the
larger the momentum
A tennis ball with a mass of 59.4 g and a softball with a mass of 198.0 g are traveling towards each other
and collide in an elastic collision. The tennis ball is traveling at 5.0 m/s to the right (+X) and the softball is
traveling at -7.8 m/s to the left (-X). What will be the final velocity of the tennis ball? - correct answer
✔-14.7
answers rated A+ 2025/2026
Why does increasing the mass of an object also increase its resultant friction force? - correct answer ✔-
an increase in mass also increases inertia
- an increase in mass also increases its normal contact force
- an increase in mass also increases the interactions between the molecules in contact
Dynamic friction is greater than static friction - correct answer ✔false
Static friction is greater than dynamic friction - correct answer ✔true
If a hand is holding a book flat against a vertical wall with -25 N of force, how much force is being
exerted by the wall in the horizontal direction? Hint: a negative force is directed to the left and a positive
force is directed to the right. - correct answer ✔25 N
The vector sum of all external forces acting on an object is the: - correct answer ✔resultant force
What effect does increasing the normal contact force have on the resultant static friction? - correct
answer ✔the static friction force increases proportionally
Why doesn't surface area affect the friction force? - correct answer ✔with an increase in surface area
there is a decrease in pressure
Consider a game of tug-of-war in which Team A is pulling with forces in the positive direction and Team
B is pulling in the negative direction. Calculate the net force of the game between Team A, if they pull
with 1,055 N, and Team B, if they pull with -1,103 N. - correct answer ✔-48 N
, Forces that do not act along the same line of action but do act through the same point are called
concurrent forces. - correct answer ✔True
Which type of force is perpendicular to the surfaces of the objects in contact? - correct answer
✔Normal contact force
Which type of force is parallel to the surfaces of the objects in contact? - correct answer ✔Friction
Force (dynamic and static)
Friction between surfaces that are not moving relative to each other. - correct answer ✔Static friction
Friction between surfaces that are moving relative to each other. - correct answer ✔Dynamic friction
Forces that act along the same line of action are called: - correct answer ✔Colinear forces
In Newton's Law of Inertia, if the Net Force is zero, what is true about the velocity? - correct answer
✔velocity is constant
If a 15 kg dumbbell is being lowered to the ground at a constant velocity, what is the vertical reaction
force being applied by the hand? - correct answer ✔147 N
What is the relationship between mass and momentum? - correct answer ✔the larger a mass, the
larger the momentum
A tennis ball with a mass of 59.4 g and a softball with a mass of 198.0 g are traveling towards each other
and collide in an elastic collision. The tennis ball is traveling at 5.0 m/s to the right (+X) and the softball is
traveling at -7.8 m/s to the left (-X). What will be the final velocity of the tennis ball? - correct answer
✔-14.7
