Write only the letter of the correct answer.
PART 1
1. Which statement best describes the law of inertia?
A)
An object will accelerate unless acted upon by a force.
B) An object will always move in a straight line unless acted upon by gravity.
C) An object will increase its speed unless acted upon by a frictional force.
D) An object at rest will stay at rest, and an object in motion will stay in motion unless acted upon
by an unbalanced force.
2. Which of the following is an example of the law of inertia?
A)
A
car
accelerates when
the
gas pedal
is
pressed.
B)
A
C)
book
A
remains
ball
on
a
table
until
it
is
pushed.
rolling
down
a
hill.
D) A rocket launching into space.
3. What will happen to an object in motion if no external forces act on it?
A)
It
will
continue
B) It will gradually slow down and stop.
C)
It
D) It will increase its speed.
moving
will
a
at
change
constant
velocity.
direction.
4. Which of the following best illustrates inertia?
A) A person pushing a stationary car
and
it starts
moving.
B) A person in a moving car suddenly stops and continues to move forward.
C) A ball dropped from
a height falling
to
the ground.
D) A rocket moving upwards against gravity.
5. Why do passengers lurch forward in a bus when it suddenly stops?
A)
B)
C)
SABO
Because
Because
of
of
the
friction
Because of the
D) Because of the acceleration of the bus.
the
force
of
inertia
of
the
between
the bus
and
the
gravity.
passengers.
road.
​