Transcript 13.12.12ForceTestReviewSlides

Forces Review
1. Which of the following are all different
types of forces?
a. Tension, Centripetal, Inertia
b. Weight, Normal, Air Resistance
c. Electromagnetic, acceleration,
Gravitational
d. Friction, Centrifugal, Thrust
2. The units kg*m/s2 is the
same as…
a.
b.
c.
d.
Speed
Acceleration
Energy
Force
3. What do we mean by Net
Force?
a. The product of all the Forces acting on
an object.
b. The quotient of all the Forces acting
on an object.
c. The sum of all of the Forces acting on
an object.
d. The absolute value of all the Forces
acting on an object
4. A 10 N Force pushes on a box east, a 25 N Force
pushes on a box West, and third Force that is 2 N
pushes on a box East. What is the Net Force?
a.
b.
c.
d.
13 N West
15 N West
17 N East
37 N West
5. A 10 N Force pushes on a box east, a 25 N Force
pushes on a box West, and third Force that is 2 N
pushes on a box East. What Force do you need to add
for the Forces to be in equilibrium (balanced)
a.
b.
c.
d.
13 N West
13 N East
37 N East
17 N West
6. Which of the following free body diagrams represents
a hovercraft traveling at a constant speed of 50 m/s?
b.
a.
FN
FN
FAR
d
c.
FN
FAR
FAP
FAR
FAR
FAP
FAP
Fg
Fg
Fg
7. A 35 kg dog on a leash is struggling to get free. After
pushing and pulling for a while with an ongoing force of
500 N, the dog breaks free. How fast will the dog
accelerate once he breaks the leash?
a.
b.
c.
d.
14.2 m/s2
1.42 m/s2
1.75x104 m/s2
0.07 m/s2
8. A 35 kg dog on a leash is struggling to get free. After
pushing and pulling for a while with an ongoing force of
500 N, the dog breaks free. Before the dog breaks free,
how much Force was the leash putting on the dog?
a.
b.
c.
d.
14.2N
500 N
0.07 N
0N
9. A very large man has a mass of 200 kg. What is this
man’s weight on earth? ag=9.8m/s2
a.
b.
c.
d.
200 N
1960 N
200 lbs
20.4 N
10. What is the Gravitational Force (Fg) or weight of a
55 kg person on Mars if ag=3.47m/s2?
a.
b.
c.
d.
19.085 N
191 N
15.85 lbs
1.985 N
11. A book is at rest on a table. The force exerted on
the book by the table is equal to the book’s
a. density
b. weight
c. volume
d. mass
12. A piano is falling from the sky with a constant
velocity. The Net Force is ?
a.pointing upward
b. balanced
c. Increasing
d. pointing downward
13. The figure below shows a block that is being
pulled along the floor. According to the figure, what
is the acceleration of the block?
a.
b.
c.
d.
2.67m/s2
0.547 m/s2
3.21 m/s2
30.7 m/s2
Ff
6.3N
11.5kg
Fap
37 N
14. A soccer player head butts a .7 kg ball with a
force of 25 N. What is the force of the ball on the
player’s head?
a.
b.
c.
d.
35.7 m/s2
25 N
17.5 N
.7 N
15. A student in a lab experiment jumps upward off
a common bathroom scale as the lab partner
records the scale reading.
• What does the lab partner observe during the
instant the student pushes off?
1
2
a. The scale reading will remain unchanged during the entire time
the student is in contact with the scale.
b. The scale reading will increase during the entire time the
student is in contact with the scale.
c. The scale reading will decrease momentarily then will increase
as the student is moving upward from the scale.
d. The scale reading will increase momentarily then will decrease
as the student is moving upward from the scale.
16. An African elephant can reach heights
of 13 feet and possess a mass of as
much as 6000 kg. Determine the weight
of an African elephant in Newtons.
a.
b.
c.
d.
58800 N
6000 N
78,000 N
612 N
17. Captain John Stapp of the U.S. Air Force
tested the human limits of acceleration by riding
on a rocket sled of his own design. His rocket
sled, known as the Gee Whiz, had a mass of
about 82 kg. What net force would be required
to accelerate the Gee Whiz and 82-kg Stapp at
450 m/s2 (the highest acceleration tested by
Stapp)?
a. 804 N
b. 3.7x104 N
c. 3.6x105 N
d. 7.2x105 N
18. Ethan is dragging a bag of grass from the garage to
the street on the evening before garbage pick-up day.
The diagram at the right is a free-body diagram. It uses
arrows to represent the forces acting upon the bag.
Each force is labeled according to type. The magnitude
of the force is represented by the size of the arrow. Use
the free body diagram to determine the net force acting
upon the bag. The values of the individual forces are.
Fn
Fgrav = Fnorm = 60.5 N
Fapp = 40.2 N
Ffrict = 5.7 N.
Ff
a. 166.9 N to the right
b. 121 N north, 34.5 N to the left
c. 20.3 N to the left, 54.8 N south
d. 34.5 N to the right
FT
Fg
19. Inertia is…
a. Newton’s 2nd Law
b. The tendency for an object to resist its
change in motion.
c. a Force
d. an object in equilibrium.
20. Alejandra is attempting to drag her
32.6-kg Golden Retriever across the
wooden floor by applying a horizontal
force of 420 N. The frictional force is 64N.
What is the acceleration?
a.
b.
c.
d.
10.9 m/s2
15 m/s2
12.9 m/s2
1.96 m/s2
21. A ball is falling towards the
ground from 10,000 m in the
air. What is the acceleration
of the ball? Neglect Air
Resistance
a.
b.
c.
d.
9.8 m/s2
15 m/s2
12.9 m/s2
1.96 m/s2
22. An aileron ______ a plane or
glider
a)
b)
c)
d)
lifts
rolls
yaws
stops
23. In order to yaw a plane to
the right, turn the rudder to the
_____
a)
b)
c)
d)
left
left then right
right
left then right
24. Which of the following is
not a type of plane rotation
a.
b.
c.
d.
pitch
yaw
roll
wash
25. If a glider pitches up, what
part of the plane should you
add mass to?
a.
b.
c.
d.
front
back
left wing
right wing
26. What must be the Lift
Force on the Glider if it has a
mass of 2 kg and descends at
a constant velocity?
a)
b)
c)
d)
2N
2kg
20N
20kg
27. Find the acceleration of a
3 kg glider being launched
from a rubber band if the
glider is catapulted with 27 N?
a)
b)
c)
d)
30m/s
9m/s2
81Nkg
9.8m/s2