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Forces &
friction
again
Hodge
podge
Forces
Friction
Weight vs
mass
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Question 1 - 10
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Which is an example of a balanced force?
A. a baby pushed in a stroller on the sidewalk
B. a child running down a path
C. A car traveling on the highway
D. a porch swing hanging from the roof
Answer 1 – 10
• D. a porch swing hanging from the roof
Question 1 - 20
• When the net forces equal 0 N, they are
considered ___________ forces
Answer 1 – 20
• Balanced
Question 1 - 30
• Which of the following always cause a change
in speed, direction, or both?
• A. balanced forces
• B. Unbalanced forces
• C. Neither
• D. Any combination of forces
Answer 1 – 30
• B. Unbalanced forces
Question 1 - 40
• Two forces act on an object. One force has a
magnitude of 10 N and is directed toward the
north. The other has a magnitude of 5N
directed toward the south. The object
experiences a net force of
• A. 5 N south
• B. 15N north
• C. 50N North
• D. 5N North
Answer 1 – 40
• D. 5N North
Question 1 - 50
• To produce a change in motion a force must
be a(n)
• A. balanced force
• B. unbalanced force
• C. frictional force
• D. gravitational force
Answer 1 – 50
• B. unbalanced force
Question 2 - 10
• Define friction
Answer 2 – 10
• The force that opposes motion between two
surfaces that are touching.
Question 2 - 20
• When I roll a cart across the floor, the force
that opposes the motion is called
_______________ friction
Answer 2 – 20
• Kinetic
Question 2 - 30
• If I push on a car and the car doesn’t move,
this is an example of ___________ friction.
Answer 2 – 30
• static
Question 2 - 40
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a)
b)
c)
d)
Which is an example of friction that is
helpful
Friction that causes engine parts to wear out
Friction between car tires and the road that
moves the car forward
Friction that wears holes in your socks
Wind causing soil erosion
Answer 2 – 40
• B. Friction between car tires and the road that
moves the car forward
Question 2 - 50
• Which of the following is a helpful decrease in
friction?
• A. Force applied while scrubbing
• B. oil added to a car engine
• C. sand applied to an icy road surface
• D. deep tread added to snow tires
Answer 2 – 50
• B. oil added to a car engine
Question 3 - 10
• Your mass on the moon would
Answer 3 – 10
• Be the same
Question 3 - 20
• If a book falls of a desk, what is the attraction?
• a) the book is attracted to the earth
• B) the earth is attracted to the book because
of mass
• C) both are attracted to each other
Answer 3 – 20
• C) both are attracted to each other
Question 3 - 30
• Do all objects have gravitational force? Explain
why or why not
Answer 3 – 30
• Yes but due to the objects’ masses, one may
have less gravitational pull than the other.
Question 3 - 40
• Does your weight change from place to place
(explain why or why not)
Answer 3 – 40
• Yes due to the mass of the objects (like the
moon vs the earth) and how far you are from
the center of the earth
Question 3 - 50
• Name the two factors that effect gravitational
pull.
Answer 3 – 50
• Distance from the object and the masses of
the objects
Question 4 - 10
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Which of these is opposed by kinetic friction
A. a book sitting on a table
B. a cat standing in a yard
C. a box sliding on a floor
D. a child leaning on a building
Answer 4 – 10
• C. a box sliding on a floor
Question 4 - 20
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Which of these is opposed by static friction?
A. A toy car rolling on the floor
B. soil erosion
C. A working pushing on a box that is too
heavy to move
• D. A dog running in the yard
Answer 4 – 20
•C. A working pushing on a box that is too heavy to move
Question 4 - 30
• The gravitational pull is greater between two
objects that have
• A. greater masses
• B. have rougher surfaces
• C. are farther apart
• D. are moving at a greater speed
Answer 4 – 30
• A. greater masses
Question 4 - 40
• When a mover puts furniture on a dolly with
wheels, which type of friction is the mover
using to make his job easier?
• A. Static
• B. Sliding kinetic friction
• C. Rolling Kinetic Friction
• D. gravitational Friction
Answer 4 – 40
• C. Rolling Kinetic Friction
Question 4 - 50
• The force of Gravity
• A. is not related to the amount of mass of the objects
• B. is related to the amount of mass of the objects
unless the mass is too small
• C. is related to the amount of mass of the objects but
only indirectly
• D. is directly related to the amount of mass of the
objects.
Answer 4 – 50
• D. is directly related to the amount of mass of the
objects.
Question 5 - 10
• As the distance between 2 objects increases,
the force of gravity between them
• A. decreases
• B. doesn’t change
• Increases slightly
• Increases greatly
Answer 5 – 10
• A. decreases
Question 5 - 20
• Which of the following are two factors that
determine speed?
• A. acceleration and time
• B. Velocity and time
• C. distance and time
• D. motion and time
Answer 5 – 20
• C. distance and time
Question 5 - 30
• A driver of an SUV drives past a jogger on the
subdivision walking path. Relative to the
jogger, the SUV is moving 15m/s. What is the
reference point in this situation?
• A. the SUV
• B. the jogger
• C. the path on which the jogger is jogging
• D. The road on which the the SUV is traveling
Answer 5 – 30
• C. the path on which the jogger is jogging
Question 5 - 40
• Which of the following most closely illustrates
motion by relating it to a reference point ?
• A. the hands of a clock relative to the numbers on a
clock
• B. the distance a race care traveled relative to the
time of travel.
• C. the speed of a bike relative to the direction of
travel
• D. the velocity change of a train relative to time
Answer 5 – 40
• A. the hands of a clock relative to the numbers on a
clock
Question 5 - 50
• In which of the following is a skater not
accelerating
• A. going straight while speeding up
• B. going straight at a constant speed
• C. making circles in a constant speed
• D. going straight while slowing down
Answer 5 – 50
• B. going straight at a constant speed