2. On
the
graph to the left , what is the acceleration of the object between t =
1 and t = 4?
3. On the graph to the left , what is the displacement between t
= 4 and t = 7?
a)
33 m
b)
19.5 m
c)
27 m
d)
6 m
4. On the graph to the left, what is the acceleration between t
=4
and t = 7?
a)
-3 m/s/s
b)
19.5 m/s/s
c)
3 m/s/s
d) 27 m/s/s
5. A decathalon athlete is practicing for the hammer
throw event.
The athlete swings
the 18.2 kg hammer in a circular path. If the athlete's arm is 0.60
meters and it takes
him 1.3 seconds to make 1 revolution, calculate the centripetal
accleration on the
hammer.
a)
14.0 m/s/s
b)
0.355 m/s/s
c)
4.8 m/s/s
d)
6.7 m/s/s
6. An object in motion will stay in motion unless an external
force
is applied is an
example of:
a)Newton's
2nd Law
b)Newton's
1st Law
c)Newton's
3rd Law
d)Newton's
4th Law
7. A drag car is initially moving a 33.5 m/s. Calculate the
car acceleration if he applies the brakes and comes to a complete stop
in 75.2 meters.
a)
7.46 m/s/s
b)
- 7.46 m/s/s
c)
- 0.222 m/s/s
d)
- 14.9 m/s/s
8. Acceleration is directly proportional to the force is an
example
of:
a)
Newton's 1st Law
b)Newton's
3rd Law
c)Newton's
2nd Law
9. What is the centripetal force on the hammer in problem
#5?
a)
6.46 N
b)
254.8 N
c)
87.4 N
d)
0.5 N
10. A racecar moves around a racetrack in 12.25
seconds.
Calculate
the radius of the track if he travels at 80.45 m/s
a) 40.2
m
b) 1.04
m
c)
156.85 m
d) 450 m
11. Calculate the centripetal acceleration in #10?
a) 0.51
m/s/s
b) 161
m/s/s
c)
80.45 m/s/s
d)
41.26 m/s/s
12. A 200 kg wagon is being pushed horizontally at a constant
velocity. The coefficient
of friction between the pavement and the wheels of the sled is 0.6
. What is the applied
force?
a)
1960 N
b)
1176 N
c)
120 N
d)
200 N
13. For every action there is an equal and opposite reaction is
an
example of:
a)
Newton's 2nd Law
b)
Newton's 1st Law
c)
Newton's 3rd Law
14. How far does a cyclist travel, if he starts from rest and has
an acceleration of 4.3
m/s/s over a 5.5 second time period?
a)
65 m
b)
118.5 m
c)
23.65 m
d)
130 m
15. The cyclist in problem #14 has a final velocity of what after
the displacement?
a)
559 m/s
b)
279.5 m/s
c)
23.64 m/s
d)
16.7 m/s
16. A projectile is launched with an initial velocity of 23.5 m/s
and at an angle of 33
degrees above the horizontal.How far away will it land?
a)
28.2 m
b)
48.84 m
c)
51.4 m
d)
31.7 m
17. How high will the projectile in #16 rise?
a)
8.36 m
b)
17.36 m
c)
21.1 m
d)
28.2 m
18. A 550 kg cart is being pushed horizontally with an applied
force
of 1650 N. What is
the net force if the coefficient of kinetic friction is 0.3 ?
a)
1485 N
b)
33 N
c)
165 N
d)
3267 N
19. Calculate the acceleration of the cart in # 18
a)
16.67 m/s/s
b)
3.0 m/s/s
c)
0.06 m/s/s
20. A 500N truck collides with a 100N compact car. Compared to
the force the car exerts on the truck, the truck exerts a force that:
a) Is
FIVE times greater
b) Is
ONE-FIFTH as great
c) Is
EQUAL to the force the car exerts.
21. A man walks 35 meters north then 15 meters west. Calculate
the
magnitude of his resultant displacement.
a)
50 m
b)
38.1 m
c)
7.1 m
d)
20 m
22. Calculate the direction of the man in # 21
a)
West of North
b)
23.2 degree W of N
c)
66.8 degrees W of N
d)
23.2 degrees N of W
23. Acceleration is inversely proportional to the mass is an
example
of:
a)
Newton's 3rd Law
b)
Newton's 1st Law
c)
Newton's 2nd Law
24. A crane lifts a 50 kg crate using a BOOM ( lever arm) of 10
m. The crate hangs down at an angle of 40 degrees to the vertical. Calculate
the torque the crate exerts on the crane.
a) 3150
Nm
b)
321.4 Nm
c)
4900 Nm
d)
3754 Nm
25. Using the position time graph above, determine the
velocity from t = 0s to t = 3 s:
26. Using the position time graph above, determine
the velocity from t = 3s to t = 6 s:
a) 0 m/s
b)
90 m/s
c)
10 m/s
d) 180
m/s
27. A boy runs horizontally off of a dock at 1.7 m/s into
the
water below. How far away from the base of the dock did he hit the
water
if the dock is 2.5 m above the water?
a)
2.4 m
b)
0.87 m
c)
0.7 m
d)
1.2 m
28. Which of the following is an example of inertia?
a)
A bullet in outer space
b)
A hovercraft
c)
Coming to a stop on a bicycle without using the brakes
d)
All of the above
29. During the space shuttle launches, the shuttle accelerates as
it uses up fuel. This is an
example of:
a)
Newton's 3rd Law
b)
Newton's 1st Law
c)
Hooke's Law
d)
Newton's 2nd Law
30. A football is thrown straight up into the air. The total time
for it to go up AND down
is 4.6 seconds. How high did the ball rise?
a)
104 meters
b)
25.9 meters
c)
23 meters
d)
11.3 meters
31. 9.8 m/s/s is an important number in physics because:
a)
It is the average speed of falling objects
b)
It represents the force of falling objects
c)
It isn't important in physics
d)
It is the acceleration due to gravity
32. Calculate the tension in a rope which is pulling a 35
N package UPWARD with an acceleration of 0.400 m/s/s.
a)
36.4 N
b)
49 N
c)
14 N
d)
87.5 N
33. Velocity is different from speed because
a)
It has different units
b)
It isn't different, they are the same
c)
Speed has a direction
d)
Velocity has a direction
34. Using the acceleration time graph above, determine the
velocity of the object during the interval t = 2 to t = 4 s. The
increments on the y axis are ONE.
a)
12 m/s
b)
0 m/s
c)
6 m/s
d)
4 m/s
35. A falling vase has a force of 25 N. Calculate the mass of the
vase.
a) 2.55 N
b)
2.55 Kg
c)
2.55 meters
d)
10 m/s/s
36. A projectile in which the direction of the vertical velocity
component changes is when:
a)
Something is thrown downward
b)
Something has no upward trajectory
c)
Something is thrown straight up or at some angle upward
37. A helicopter is traveling with a velocity of 33.5 m/s and at
a bearing of 35 degrees East of
South. What is the horizontal velocity of the helicopter?
a)
19.21 m/s,S
b)
19.21 m/s,E
c)
27.44 m/s,E
d)
27.44m/s,S
38. What is the vertical velocity of the helicopter in problem
#37?
a)
19.21 m/s,E
b)
27.44 m/s,S
c)
27.44 m/s,E
d)
19.21 m/s,S
39. You must remember to use HALF of the time to determine how
high
a projectile is
when:
a)
It does not have an upward trajectory
b)
It has an upward trajectory
c)
The vertical component never changes
d)
A projectile is not shot straight up
40. To increase the FORCE DUE TO GRAVITY between a set of objects
by four one must:
a)
Double one of the masses
b)
decrease the separation distance by two
c)
increase the distance between them by two
d)
Decrease the mass of BOTH objects
41. A vector must always have:
a)
Force and Time
b)
Force and Acceleration
c)
Magnitude
d)
Magnitude and Direction
42. The trajectory of a projectile has 2 components:
a)
Magnitude and Direction
b)
Horizontal and Vertical
c)
Force and Acceleration
d)
Force and Time
43. If the centripetal force acting on an object suddenly
ceases, the object will:
a)
Stop Moving
b)
Fly outward parallel to the radius
c)
Move in parabolic path
d)
Continue to move tangent to the circle due to inertis
44. A crash test dummy is inside a test car moving at 55 km/h.
How
fast is the dummy
moving relative to the seat he is sitting in?
a)
22 m/s
b)
0 km/h
c)
55 km/h
d)
55 m/s
45. Suppose the BOX shown is being pulled at a constant
speed. What does FRICTION equal to?
a)
The force normal
b)
The pulling force
c)
The vertical component of the pulling force
d)
The horizontal component of the pulling force
46. In the free body diagram above, the force normal is
equal to what?
a) The
weight
b) The
weight MINUS the horizontal of the pulling force
c) The
weight MINUS the vertical component of the pulling force
d)
friction
47. Calculate the coefficient of kinetic fricton if the
pulling force is 10 N and the mass of the box is 5.0 - kg. Assume it is
still moving at a constant speed.
a) 8.66
b) 0.20
c)
0.177
48. The external force that Newton talks about in his
first law is
probably
a)
Centrifugal force
b)
Friction
c)
The Net Force
d)
Centripetal force
49. A box is sliding down a
frictionless 30 degree incline, the acceleration of the box is:
a) 8.5
m/s/s
b) 9.8
m/s/s
c)
4.9 m/s/s
50.In the vector quantity, 20 N, NE. The "20 N" represents:
a)
The direction of the vector
b)
The magnitude of the vector
c)
The horizontal component of the vector
d)The
vertical component of the vector