Introduction to Physical Science-Section 2
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Answers with Verified Solutions | Latest
Updated 2026
Radio waves have the longest wavelengths of all EM
radiation.
Radio wavelengths range from a few
meters to
millions of meters or more. Because they
have the
longest wavelengths, radio waves have the
lowest
frequencies and lowest energies of all
types of EM
radiation.
waves produced naturally by lightning and
by
certain kinds of stars and galaxies
speed: how fast an object is moving
You can figure out an object's speed by
dividing
the distance it traveled by the amount of
time it
took to travel that distance.
,Consider two trains leaving a rail the same.
station, one moving to the west
and
the other to the east. Both are
moving at 1.0 m/s. Their speeds
are
velocity: an object's speed and direction
"40 mph due east." Notice that, unlike
speed,
velocity has a direction.
Acceleration: is a change in an object's velocity.
In other words, acceleration occurs when
an object
speeds up,
slows down, and/or
changes direction.
Like velocity, acceleration has a direction.
A ball is initially moving down a Acceleration by speeding up
ramp Correct:
with an increasing velocity. Which As the ball goes down the ramp, it speeds
term describes the ball's up.
acceleration
at that instant?
When acceleration is in the same When acceleration is in the opposite
direction as velocity, speed direction from
increases..... velocity, speed decreases.
,force is a push or a pull
An object will accelerate only if there is a
force
acting on it. Further, you can say that the
acceleration of the object will be in the
same
direction as the force that is causing the
acceleration.
In SI units, kilograms are a unit for and newtons are the unit for force.
mass,
Suppose the grocery cart is at The cart ends up moving faster compared
rest, to
and you push it to accelerate it into before.
motion. How does the result differ Correct:
if The cart will move faster than before.
you pushed with a force of 40 N
instead of 20 N for the same
amount
of time?
Net force is the combination of all of the forces
acting on an
object.
is the sum of all the forces
If forces are both acting in the same
direction, you
can add them together to determine the
net force.
balanced forces Forces that combine to produce a net force
of zero
cannot cause an object to accelerate.
, Forces acting on an object that The forces cancel each other and cause
combine to give zero net force are zero
said to be balanced. Why would acceleration.
that Correct:
term be appropriate? The term balanced refers to the forces
combining
to precisely cancel each other.
Newton’s first law says that the net force on an object is the
cause of
its acceleration. If there is no net force,
there is no
acceleration, and the object’s velocity will
remain
constant. If that velocity is zero, meaning
the object
is at rest, it stays at rest. If it is moving, it
continues
moving in a straight line at the same
velocity. If you
see an object accelerating, then Newton’s
first law
tells you that there must be a nonzero
force acting
on it.
The net force on an object is the cause of
its
acceleration.
Latest Premium Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
Radio waves have the longest wavelengths of all EM
radiation.
Radio wavelengths range from a few
meters to
millions of meters or more. Because they
have the
longest wavelengths, radio waves have the
lowest
frequencies and lowest energies of all
types of EM
radiation.
waves produced naturally by lightning and
by
certain kinds of stars and galaxies
speed: how fast an object is moving
You can figure out an object's speed by
dividing
the distance it traveled by the amount of
time it
took to travel that distance.
,Consider two trains leaving a rail the same.
station, one moving to the west
and
the other to the east. Both are
moving at 1.0 m/s. Their speeds
are
velocity: an object's speed and direction
"40 mph due east." Notice that, unlike
speed,
velocity has a direction.
Acceleration: is a change in an object's velocity.
In other words, acceleration occurs when
an object
speeds up,
slows down, and/or
changes direction.
Like velocity, acceleration has a direction.
A ball is initially moving down a Acceleration by speeding up
ramp Correct:
with an increasing velocity. Which As the ball goes down the ramp, it speeds
term describes the ball's up.
acceleration
at that instant?
When acceleration is in the same When acceleration is in the opposite
direction as velocity, speed direction from
increases..... velocity, speed decreases.
,force is a push or a pull
An object will accelerate only if there is a
force
acting on it. Further, you can say that the
acceleration of the object will be in the
same
direction as the force that is causing the
acceleration.
In SI units, kilograms are a unit for and newtons are the unit for force.
mass,
Suppose the grocery cart is at The cart ends up moving faster compared
rest, to
and you push it to accelerate it into before.
motion. How does the result differ Correct:
if The cart will move faster than before.
you pushed with a force of 40 N
instead of 20 N for the same
amount
of time?
Net force is the combination of all of the forces
acting on an
object.
is the sum of all the forces
If forces are both acting in the same
direction, you
can add them together to determine the
net force.
balanced forces Forces that combine to produce a net force
of zero
cannot cause an object to accelerate.
, Forces acting on an object that The forces cancel each other and cause
combine to give zero net force are zero
said to be balanced. Why would acceleration.
that Correct:
term be appropriate? The term balanced refers to the forces
combining
to precisely cancel each other.
Newton’s first law says that the net force on an object is the
cause of
its acceleration. If there is no net force,
there is no
acceleration, and the object’s velocity will
remain
constant. If that velocity is zero, meaning
the object
is at rest, it stays at rest. If it is moving, it
continues
moving in a straight line at the same
velocity. If you
see an object accelerating, then Newton’s
first law
tells you that there must be a nonzero
force acting
on it.
The net force on an object is the cause of
its
acceleration.
