Physics 121 Reading Quizes 2025
Study Test
When a suitcase is thrown onto a baggage conveyor belt at the airport it slides for a bit,
then starts moving along with the moving conveyor belt and stays in contact with it
whether it speeds up, slows down, or goes around corners. The best way to describe
what is happening to the suitcase is-- - Answer-There is a friction force between the
suitcase and the belt; this force keeps the suitcase moving with the conveyor belt.
A box of mass mm slides down an inclined ramp. The ramp makes an angle θ with the
horizontal. The coefficient of kinetic friction for contact between the bottom surface of
the box and the surface of the ramp is μk. The magnitude of the frictional force between
the ramp and the box is - Answer-μk m g cosθ
A box of mass m sits motionless on an inclined ramp. The ramp makes an angle θ with
the horizontal. The coefficient of static friction for contact between the bottom surface of
the box and the surface of the ramp is μs. The magnitude of the frictional force between
the ramp and the box is - Answer-m g sinθ
The total force on an object sliding down a ramp at constant speed when friction is
present is zero. - Answer-tru
In the winter of 2003-2004 the Hubble Space Telescope was focused (off and on) at a
tiny patch of sky about as big as an area of 0.5 m^2 viewed 1 meter from your eye. In
this long time exposure image there are about 10,000 galaxies (yes, galaxies). About
how many galaxies are there in the entire sky? - Answer-5*10^11
In the English system of units the unit of force is the pound and the acceleration of
gravity is 32 ft/s22. Think really hard about Newton's second law (do not just look up a
conversion factor--think hard) and figure out what someone's mass would be in English
units if their weight were 160 pounds. - Answer-5
An object will not accelerate in the absence of forces if it is in an inertial reference
frame. Or, in plain English, no net force means the velocity stays the same, unless your
reference frame is accelerating. - Answer-Newton's First Law
The acceleration of an object is inversely proportional to its mass. - Answer-Newton's
Second Law
Forces come in equal and opposite pairs. - Answer-Newton's Third Law
, F=ma - Answer-Newton's Second Law
An object in an inertial reference frame will go at a constant speed in a straight line in
the absence of external forces. - Answer-Newton's First Law
The acceleration of an object is proportional to the net force applied to it. - Answer-
Newton's Second Law
Two boys are having a snowball fight and in one exchange the snowballs they throw
meet in midair. The two balls strike each other in a glancing collision, so they bounce off
each other but each ball is dented up and deformed. In this collision -- - Answer-
momentum is conserved
A 1 kg book at rest is dropped from a height of 1 meter above the floor. How much work
does the force of gravity do on the book on its trip to the floor? Make sure you
understand the connection between this answer and the kinetic energy of the book just
before it hits the floor. - Answer-9.8 J
A ball consisting of two halves with a compressed spring smashed between them is
moving from left to right at a velocity vv on a frictionless surface. At some point the
spring suddenly expands, separating the two halves of the ball. One half of the ball
happens to have a velocity of 0. What is the speed of the other half of the ball? -
Answer-2v
When I compress a spring, am I doing positive or negative work on the spring? Choose
one answer. - Answer-positive
When is a force considered to be "non-conservative" - Answer-When the work depends
on the path
A spring is pulled out a distance dd from its relaxed position until it exerts a force of 50
N. The spring is now pulled out until it exerts a force of 75 N. How far is it pulled out now
from its relaxed position? - Answer-3d/2
The minimum wage is in the news. What is the physical unit of a $15 minimum wage? -
Answer-Dollars / hours
Suppose I drive 50 miles from Provo to the Salt Lake City airport and then back to
Provo again. According to the book, what distance did I drive? - Answer-100 miles
Suppose I drive 50 miles from Provo to the Salt Lake City airport and then back to
Provo again. What is my displacement? - Answer-0 miles
As you sit quietly in your chair studying physics your acceleration is: - Answer-0 m/s
Study Test
When a suitcase is thrown onto a baggage conveyor belt at the airport it slides for a bit,
then starts moving along with the moving conveyor belt and stays in contact with it
whether it speeds up, slows down, or goes around corners. The best way to describe
what is happening to the suitcase is-- - Answer-There is a friction force between the
suitcase and the belt; this force keeps the suitcase moving with the conveyor belt.
A box of mass mm slides down an inclined ramp. The ramp makes an angle θ with the
horizontal. The coefficient of kinetic friction for contact between the bottom surface of
the box and the surface of the ramp is μk. The magnitude of the frictional force between
the ramp and the box is - Answer-μk m g cosθ
A box of mass m sits motionless on an inclined ramp. The ramp makes an angle θ with
the horizontal. The coefficient of static friction for contact between the bottom surface of
the box and the surface of the ramp is μs. The magnitude of the frictional force between
the ramp and the box is - Answer-m g sinθ
The total force on an object sliding down a ramp at constant speed when friction is
present is zero. - Answer-tru
In the winter of 2003-2004 the Hubble Space Telescope was focused (off and on) at a
tiny patch of sky about as big as an area of 0.5 m^2 viewed 1 meter from your eye. In
this long time exposure image there are about 10,000 galaxies (yes, galaxies). About
how many galaxies are there in the entire sky? - Answer-5*10^11
In the English system of units the unit of force is the pound and the acceleration of
gravity is 32 ft/s22. Think really hard about Newton's second law (do not just look up a
conversion factor--think hard) and figure out what someone's mass would be in English
units if their weight were 160 pounds. - Answer-5
An object will not accelerate in the absence of forces if it is in an inertial reference
frame. Or, in plain English, no net force means the velocity stays the same, unless your
reference frame is accelerating. - Answer-Newton's First Law
The acceleration of an object is inversely proportional to its mass. - Answer-Newton's
Second Law
Forces come in equal and opposite pairs. - Answer-Newton's Third Law
, F=ma - Answer-Newton's Second Law
An object in an inertial reference frame will go at a constant speed in a straight line in
the absence of external forces. - Answer-Newton's First Law
The acceleration of an object is proportional to the net force applied to it. - Answer-
Newton's Second Law
Two boys are having a snowball fight and in one exchange the snowballs they throw
meet in midair. The two balls strike each other in a glancing collision, so they bounce off
each other but each ball is dented up and deformed. In this collision -- - Answer-
momentum is conserved
A 1 kg book at rest is dropped from a height of 1 meter above the floor. How much work
does the force of gravity do on the book on its trip to the floor? Make sure you
understand the connection between this answer and the kinetic energy of the book just
before it hits the floor. - Answer-9.8 J
A ball consisting of two halves with a compressed spring smashed between them is
moving from left to right at a velocity vv on a frictionless surface. At some point the
spring suddenly expands, separating the two halves of the ball. One half of the ball
happens to have a velocity of 0. What is the speed of the other half of the ball? -
Answer-2v
When I compress a spring, am I doing positive or negative work on the spring? Choose
one answer. - Answer-positive
When is a force considered to be "non-conservative" - Answer-When the work depends
on the path
A spring is pulled out a distance dd from its relaxed position until it exerts a force of 50
N. The spring is now pulled out until it exerts a force of 75 N. How far is it pulled out now
from its relaxed position? - Answer-3d/2
The minimum wage is in the news. What is the physical unit of a $15 minimum wage? -
Answer-Dollars / hours
Suppose I drive 50 miles from Provo to the Salt Lake City airport and then back to
Provo again. According to the book, what distance did I drive? - Answer-100 miles
Suppose I drive 50 miles from Provo to the Salt Lake City airport and then back to
Provo again. What is my displacement? - Answer-0 miles
As you sit quietly in your chair studying physics your acceleration is: - Answer-0 m/s
