Download Motion and Forces BLACKOUT AK

Motion and Forces BLACKOUT
Name: Answer Key
1. Describe motion in 2. 2. Describe speed in
your own words.
your own words. How
Motion is a change in a
do you calculate speed?
object’s position
Speed is a description of
compared to a fixed
how fast an object
object. OR an object
changes position at any
moves comparative to
given time. Speed is
an object that stays in
calculated by dividing
place.
distance by time.
3. Describe the factors
that determine
velocity.
The factors that
determine velocity are
speed and direction.
4. Why would it be
important to know
the velocity of a
moving object?
It would be important to
know the velocity of a
moving object to know
how fast it is going and
in what direction it is
headed.
5. Compare and
contrast balanced
and unbalanced
forces.
Balanced forces are equal
and usually do not cause
a change in motion.
They act in opposite
directions. On the other
hand, unbalanced forces
are not equal and cause a
change in motion. These
forces do not cause a
change in motion.
7. How is the net force
of an object
calculated if the
forces are acting in
opposite directions?
The net force on an
object, if the forces are
acting in opposite
directions, is calculated
by subtracting or finding
the difference between
the greater and lesser
force.
8. How is the net force
of an object
calculated if the
forces are acting in
the same directions?
The net force on an
object, if the forces are
acting in the same
direction, is calculated
by adding the forces that
are acting in the same
direction and then
finding the difference
between the greater and
lesser force if there are
forces acting also in
opposite directions.
12. Explain one example
of Newton’s 2nd Law
of Motion.
9. Describe Newton’s 1st
Law of Motion.
Newton’s first Law of
Motion is also known
as the “Law of
Intertia”. It
describes that an
object that is not
moving will stay that
way and an object
that is moving will
stay that way until an
outside force changes
the motion.
13. Describe Newton’s
3rd Law of Motion.
Newton’s third Law of
Motion says that for
every action that
happens a reaction of
equal and opposite value
happens in response.
6. What is a net force?
Net force is the total of
all forces acting on an
object.
10. Explain one example
of Newton’s 1st Law
of Motion.
An example of Newton’s
first law is when you are
traveling one direction
on a roller coaster and
the coaster suddenly
changes direction. Your
body wants to continue
traveling in the same
direction it was and
therefore you seemingly
are pulled in different
directions at once.
14. Explain one example
of Newton’s 3rd Law
of Motion.
An example of Newton’s
third Law is when a
person jumps from a
high height and lands
on the ground. That
person puts a force on
the ground and the
11. Describe Newton’s
2nd Law of Motion.
Newton’s Second Law of
Motion describes the
relationship between
force, mass and
acceleration.
One example of Newton’s
Second Law is when a
person uses two different
bowling balls with
different masses. One of
the balls takes more
force to move than the
other. One accelerates
more quickly than the
other.
15. Draw a ball rolling
16. Explain inertia.
and identify all the
Does an elephant or
forces working on the
a mouse have more
ball. Remember to
inertia?
use arrows to show
the direction of the
An elephant has more
forces.
inertia because it has
more mass. Therefore,
the elephant has more
resistance to change in
motion.
ground puts and equal
force back on the
person. The reaction
force is felt in the
person’s legs.
17. Which will move
farther if you roll
them with the same
amount of force: a
bowling ball or a
tennis ball? Why?
A tennis ball will roll
farther because it has
less inertia.
18. Describe air
resistance.
21. Describe all the
forces working on
you as you lie in bed
sleeping.
Gravity pushing
downward, upward force
pushing against gravity
and static friction keeps
you in place.
25.) What is an
independent variable?
An independent
variable is one that
the scientist changes.
19. Describe gravity.
20. Describe friction.
Gravity is an attractive
force that pulls objects
toward one another.
Friction is a force that
acts in the opposite
direction of motion.
22. Are the forces
working on you as
you sleep balanced or
unbalanced? How do
you know?
The forces are balanced
because you stay in place.
23. Write one example of
an object
accelerating.
24. What is one strategy
you will use to study
for your test
tomorrow?
26.) What is a testable
question? What is the
correct format?
A testable question is
one that an
experiment can be
designed around.
The correct format is
“How does
_____affect
_____?”
27.) What is a dependent
variable?
Air resistance is the fluid
friction that a falling or
moving object
experiences due to the
resistance of particles.
29.) What is a constant
variable?
30.) What is an
observation?
A constant variable is one
that stays the same during
the experiment.
An observation is
something you notice
using your five senses.
What is an inference?
An inference is a
conclusion that is reached
An example of an object
accelerating would be
when a racecar is
maneuvering in and out
between other racecars.
Insert your fabulous
answer here
A dependent variable is
one that can be
measured and
depends on the
independent
variable.
28.) What is a
hypothesis? How should
a hypothesis be written?
A hypothesis is a
statement that is a
guess about the
outcome of your
experiment. It
should be written in
an “if, then, because”
statement.
31.) Using the diagram
below, label the action
and reaction forces.
32.) Using the diagram
below, calculate the net
forces of the objects.
50 Newtons of force to the
left
0 Newtons
based on five senses.
Action is the girl jumping
downward and reaction is
the trampoline going
upward therefore causing
the girl to go upward.