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Question
Section 8.1
Chapter 8, Motion and Forces
Answer
Section 8.1
1. What do you call the distance traveled
by an object divided by the time it takes
to travel that distance?
1. You call the distance traveled by an
object divided by the time it takes to
travel that distance
___________________________________.
2. In order to determine speed, one must
know
___________________________________.
3. The speed of an object at rest is
__________________.
4. The difference between speed and
velocity is that velocity includes
______________________________.
5. The velocity of the plane that is flying
at 735 miles per hour at an altitude of
35,000 feet, is currently over Kansas
and is approximately 16 minutes ahead
of its scheduled time
2. What must you know in order to
determine speed?
3. When an object is at rest, what is its
speed?
4. What does velocity include when
accounting for the difference between
speed and velocity?
5. What is a planes velocity if the
airplane is flying at 735 miles per hour
at an altitude of 35,000 feet, is currently
over Kansas and is approximately 16
minutes ahead of its scheduled time?
6. The following statement does not
indicate velocity, why?
“12 miles from Newark to New
Brunswick.”
7. What factors do you need when
calculating momentum?
8. If you divide momentum by velocity,
the result is the value of the
object’s_____?
9. The values are always zero of
_______
whenever an object is standing still.
10.FREE FREE!
____________________________________.
6. The statement does not include
velocity because it does not include
____________________________________.
7. When calculating momentum you need
___________________, ________________
and ________________________________.
8. The value of the object’s
_____________ is the result if you
divide momentum by velocity, the
result is
9. Whenever objects are standing still, the
values that are always zero are __________,
__________________ and ______________.
10. FREE FREE!
11. What is the term used when an
object covers equal distances in equal
amounts of time?
12. When calculating the average speed
of an object, because the speed can
change from one instance to the next,
you must?
13. What two terms are included when
describing velocity?
14. A passenger van loaded with people
weighs 2 tons and is traveling south on
the interstate heading for Florida. It has
been averaging 58 mi/hr for the journey
and has traveled over 1550 miles so far.
It has stopped to refuel. What is its
current momentum?
11. The term used when an object covers
equal distances in equal amounts of
time is: it is moving at a ___________
Speed.
12. Because speed can change from one
instance to the next, you must_____________
_____________________________________
_____________________________________
in order to calculate the average speed.
13. The two terms that are included when
describing velocity are ______________
and
__________________________________.
14. The current momentum of a passenger van
loaded with people weighing 2 tons and is
traveling south on the interstate heading for
Florida, averaging 58 mi/hr for the journey
and has traveled over 1550 miles so far but
has stopped to refuel is________________.
Section 8.2
Section 8.2
15. Acceleration is defined as ?
15. Acceleration is defined as the _________
in velocity divided by ___________________.
16. The SI unit for acceleration is
______________________.
17. When the velocity of an object changes, it
is acted upon by a ___________________.
18. If a stationary object has a net force of
zero acting on it, then the object will
____________________________________.
19. If the net force on an object is zero then
the object has __________________ forces.
16. What is the SI unit for acceleration?
17. What acts upon an object to change
its velocity?
18. What will happen to a stationary
object if the net force acting on it is
zero?
19. What kind of forces does an object
have if the net force on the object is
zero?
20. When one group pulls another group
across a setline in a game of Tug-of
War, this is an example of what kind of
forces?
21. Define friction.
22. What kind of conclusions can you
draw when a force is continuously
applied to an object causing it to
accelerate, but after a period of time the
object stops accelerating?
20. In a game of Tug-of War, when one group
pulls another group across a set line, is an
example of ________________________
forces?
21. Friction is a __________________ that
_____________________ motion between
________ surfaces that are _______________.
22. When a force is continuously applied to an
object causing it to accelerate, but after a
period of time the object stops accelerating, a
logical conclusion would be that the object is
experiencing some kind of _______________.
23. What do you call the downward
force exerted on objects due to gravity?
24. The force of gravity does what when
objects are moved further apart from
each other?
25. Define acceleration.
26. During a race, a sprinter increases
from 5.0 m/s to 7.5 m/s over a period of
1.25 s. What is the sprinter’s average
acceleration during this period?
23. The downward force exerted on objects
due to gravity is best described as
___________________________.
24. When objects are moved further apart
from each other the force of gravity
______________________________.
25. Acceleration is the __________ at which
__________________ changes.
26. The sprinter’s average acceleration during
this period is________________________.
Section 8.3
Section 8.3
27. What is the SI unit for force?
27. The SI unit for force is called the
______________________-.
28. In a free fall you would use the unit of
____________________.
29. Mass and weight are proportional and
equal is _________________.
30. Weight is the gravitational force an object
experiences due to its mass is __________.
28. What unit do you use to measure
acceleration in a free fall?
29. True or false. Mass and weight are
proportional and equal?
30. T or F. Weight is the gravitational
force an object experiences due to its
mass.
31. The weight of an object on Earth is
greater than the weight of an object on
the surface of the moon, but the object’s
mass stays the same?
32. What happens to the velocity of an
object that is falling when air resistance
balances the weight of that object?
33. Force is the product of mass and
acceleration according to what law of
motion by Newton?
34. Rearrange Newton’s second law of
motion equation to define acceleration
in terms of force and mass.
35. What is a free fall?
36. Where is the free fall acceleration of
an object under the Earth’s gravity
directed?
37. What is the value for acceleration of
objects in free fall near the Earth?
31. The weight of an object on Earth is greater
than the weight of an object on the surface of
the moon, but the object’s mass stays the same
is ______________.
32. When air resistance balances the weight of
an object that is falling, the velocity remains
_____________________.
33. According to Newton’s _________ law of
motion, force is the product of mass and
acceleration.
34. Newton’s equation for his 2nd law of
motion is _____________________.
35. A free fall is the ______________ of an
object resulting from the force of
______________.
36. Under the Earth’s gravity, the free fall
acceleration of an object is directed toward the
_________________ of the Earth.
37. The value for acceleration of objects in
free fall near the Earth is _______________.
38. Would there be any difference in
acceleration of a 1.5 kg. Book and a 15
kg rock dropped from the same height
and did not have air resistance?
40. What is the velocity of an object
called when gravitational forces and air
resistance equalize on an object that is
falling toward the Earth and the object
stops accelerating?
38. _________ there would ________ be any
difference in acceleration of a 1.5 kg. Book
and a 15 kg rock dropped from the same
height and did not have air resistance? They
would both be the ____________.
39. Terminal velocity is the ______________
velocity reached by a _______________
object, occurring when __________________
of the medium is ___________________ to
the force due to _____________________.
40. It is known as _______________
___________________ when gravitational
forces and air resistance equalize on an object
that is falling toward the Earth and the object
stops accelerating?
Essays
Essays
41. You have two photos of a person
walking. One shows the person at the
corner of Third and Main Streets, the
other shows the person at the corner of
Tenth and Main streets. There are
lampposts in every corner of this town,
and the first picture shows it to be
10:32:00 exactly. The picture shows it
to be 10:49:30.
You know three facts:
1. All of the clocks are
synchronized
2. There are 12 equal-sized blocks
per mile in this town;
3. The streets that cross Main in
this area are numbered
consecutively, with no
interruptions.
What is the person’s average speed in
miles per hour (rounded off to the
nearest tenth)?
42. A box of air contains a piece of
foam and a rock. Both objects are
dropped at the same time. The rock
falls faster than the foam. However,
when the air is removed from the box to
create a vacuum, both the foam and the
rock reach the bottom at the same time.
Explain why this happens.
41. If there are 12 blocks per mile, the person
walks _______________________ of a mile,
[approximately ________mi.] in ________
minutes {0.29 hr.]. In mi/hr this would be
__________divided by ____________
equaling _____ mi/hr.
39. Define terminal velocity.
42. In the first case, the air provides more
________________________ to the motion
of the foam than to that of the rock, so the
_____________ falls faster. In a vacuum
there is no air to provide _________________
to the objects, so only the force of
____________________ is acting upon them
and they fall at the same time.
43. Explain why organisms that live in
water do not need as strong a skeletal
structure as organisms that live on land.
44. Guess what?
45. Time to go for pizza again!
43. There is nothing on land to counteract the
_____________ of ______________, so
organisms must develop strong structures to
support their _______________ against it. In
water, the __________________ force of
________________ is _______________ by
the upward forces of the water, so strong
skeletons and other supporting structures are
unnecessary.
44. You’re done! You have just mastered
exciting knowledge about motion and forces.
“May the Force be with You!”
45. So, study hard, try putting this on cards
and good luck on your test. I’m available if
you need me. Later, Mrs. G.!!