Download Prep-Physics Practice Final Exam Free body diagram 1. Dale skis

Prep-Physics Practice Final Exam
Free body diagram
1. Dale skis down a hill with a slope of 30°. Given that there is friction
acting between his skis and the snow as he moves, which of the following
is the correct free-body diagram for Dale?
2. A toy car on a string is pulled across a table horizontally. The string
is at an angle of 30°. Which is the correct free-body diagram for this
situation?
A mechanical life is used to pull an engine out of a car. The engine is
attached to the lift with chain and lifted straight up. The free-body
diagram below shows the engine when it is suspended in the air.
3.What is force 2 in this diagram?
4. What are these forces?
A. Tension
B. Weight
C. Normal force
D. Friction
5.What information does a free-body diagram show?
Single force
Friction
6. What is static friction?
7. What is kinetic friction?
8. In what direction does the force of friction act? (know all cases)
9. A man pushes with a force of 200 N on a bookcase of mass 80 kg. The
coefficient of static friction between the bookcase and the floor is 0.75.
Because of friction, the bookcase does not move. What is the force of
friction on the bookcase?
10. A water skier is pulled behind a boat by a rope. The rope has a tension
of 450 N and is at an angle of 21°. What is the y-component of the
tension?
11. A box slides across a wooden floor. There is a normal force of 800 N
acting on the box, and the coefficient of kinetic friction is 0.25. What is the
force of friction acting on the box as it slides across a wooden floor?
12. A box of mass 15 kg slides across the ground with a frictional force of
80 N what is µk between the box and the ground?
13. A box of mass 15 kg sits on the floor with a frictional force of 100 N
what is µs between the sled and the ground?
14. A box of mass 4 kg sits on a table. The coefficient of static friction
between the table and the television is 0.25. What is the minimum applied
tension? force that will cause the box to slide?
Multiple forces
15. A water skier is pulled behind a boat by a rope. The rope has a tension
of 650 N and is at an angle of 30°. What is the y-component of the
tension?
16. A water skier is pulled behind a boat by a rope. The rope has a tension
of 650 N and is at an angle of 30°. What is the x-component of the
tension?
Normal force
17.Jake drags a box of mass of 10 kg across the snow. The sled is attached
to a rope he pulls with a force of 30 N at an angle of 30°. If there is no
friction, what is the normal force acting on sled?
18. A book with mass 2.3 kg sits on a table. What is the normal force on the
book?
19.Dale and Alex push on opposite sides of a box. Dale pushes to the left
with a force of 100 N, while Alex pushes to the right with a force of 125 N. If
the couch has a mass of 5 kg, What is the acceleration of the box?
20. A box has a mass of 5 kg. Box slides down a hill that has a slope of 30°.
What is the component of its weight that is along its direction of motion?
21. A box slides down a hill at an angle of 10°. A box has a mass of 5 kg.
What is the normal force on the box?
22. An object of mass m slides down an incline with angle Ø . Which
expression shows the net force on the object along the surface of the
incline? Assumed there is no friction
23. An object of mass m slides down an incline with angle Ø. Which
expression shows the net force on the object perpendicular to the surface
of the incline?
A.
B.
C.
D.
- mg cos(Ø)
=0
FN - mg sin(Ø) =
0
FN - mg cos(Ø)
= mg
FN - mg sin(Ø) =
mg
FN
Free falling
25. What is free fall?
26. A box falls from a table. If there is no air resistance, what is the
acceleration-time graph for this book?
27.A box falls from a tree. How fast is the box moving after 1 second?
28. You drop a ball from a height of 1 m. What is the impact speed of your
ball?
29. You throw a ball straight up into the air with a speed of 20 m/s. How
long does it take the ball to reach its highest point?
30. You throw a ball straight up into the air with a speed of 10 m/s. How
high does the ball go?
31. You calculate that it would take a ball 2 seconds to fall from your
hand to the ground if there were no air resistance. In reality, how long will
it take the ball to reach the ground?
A. Less than 0.5 seconds
B. Exactly 0.5 seconds
C. More than 0.5 seconds
D. The paper will never reach the ground
32. You want to calculate how long it takes a ball to fall to the ground
from a height of 1 m. Which equation can you use to calculate the time?
(Assume no air resistance.)
A.
B.
C.
D.
Projectile motion
33. What is projectile motion?
34. A ball rolls horizontally off a table of height 1 m with a speed of 4 m/s.
How long does it take the ball to reach the ground?
35. A marble is flicked horizontally off a desk with a speed of 3 m/s. If it
takes the marble 0.8 seconds to hit the ground, how far from the desk
does it land?
36. A marble is thrown horizontally from a table that is 1 m above the
ground. If the marble is thrown with a speed of 12 m/s, how far from the
table does the ball land?
Projectile with an angle Ø
37. A projectile is fired with a velocity of 20 m/s at an angle of 30. What is
the vertical component of the velocity?
38. A projectile is fired with a velocity of 20m/s at an angle of 30. What is
the horizontal component of the velocity?
39. A marble ball is launch with a velocity of 8 m/s at an angle of 30. What
is the ball's acceleration in the vertical direction as it flies through the air?
40. A football is kicked with a velocity of 8 m/s at an angle of 30°. What is
the ball's acceleration in the horizontal direction as it flies through the air?
41. A ball is lunch into the air with a velocity of 4 m/s at an angle of 30.
What is the maximum height reached by the ball?
42. A soccer player kicks a ball with a speed of 30 m/s at an angle of 10.
How long does the ball stay in the air?
43. A ball is lunch with a speed of 4 m/s at an angle of 30°. How far away
does the ball land?
44. A ball is thrown with a speed of 20 m/s at an angle of 30°. Which of the
following statements describes the motion of the ball at the top of its
trajectory?
A. The vertical component of velocity is zero.
B. The vertical acceleration is zero.
C. The horizontal component of velocity is zero.
D. The horizontal component of velocity is increasing.
Circular motion
45. Which of the following happens to an object in uniform circular
motion?
46. The picture below shows a person swinging a yo-yo in a circle.
47. Which vector shows the velocity of the yo-yo at this moment?
A. A
B. B
C. C
D. D
48.A car drives at a constant speed of 2 m/s around a circle of radius 100
m. What is the centripetal acceleration of the car?
49. A race car has a centripetal acceleration of 10 m/s2 as it goes around
a curve. If the curve is a circle with radius 30 m, what is the speed of the
car?
50. A point at the end of a spinning helicopter blade has a centripetal
acceleration of 30 m/s2. If the velocity of the blade at this point is 10 m/s,
how long is the helicopter blade?
51. A toy car is tied to a post with string, causing it to drive in a tight circle.
This is shown in the picture below
.
Energy – know all types of energy
52. Which term describes the energy of position?
53. Which term describes energy stored within a stretched object?
54. Which of the following is a form of kinetic energy?
55. As a marble rolls down a table, which types of energy are changing?
56. What is net force?
57. The Moon has much less gravitational force than Earth. What would
happen if you went to the Moon?
Conservation law of energy
58. What is the SI unit for kinetic energy?
59. A box of mass 38 kg is lifted to a height of 0.8 m. How much
gravitational potential energy is added to the box? Acceleration due to
gravity is g = 9.8 m/s2.
60. A marble has a speed of 2 m/s and a mass of 0.05 kg. What is the
marble's kinetic energy?
61. The table below shows the acceleration of gravity on different bodies
in the solar system.
On which body would a 30 kg bowling ball have the least gravitational
potential energy when lifted to a height of 1 m?
62. A ball of mass 2 kg is dropped from a height of 1 m. How much
mechanical energy does it have right before it hits the ground? (Assume
there is no air resistance.) Acceleration due to gravity is g = 9.8 m/s2.
63. A block of mass 5 kg slides down an inclined plane that has an angle
of 10. If the inclined plane has no friction and the block starts at a height
of 0.8 m, how much kinetic energy does the block have when it reaches
the bottom? Acceleration due to gravity is g = 9.8 m/s2.
64. A pendulum has a mass of 0.2 kg and starts at a height of 1 m. If it is
released from rest, how fast is it going when it reaches the lowest point of
its path? Acceleration due to gravity is g = 9.8 m/s2.
65. A feather of mass 0.001 kg falls from a height of 2 m. Under realistic
conditions, it experiences air resistance. Based on what you know about
friction, what can you say about the kinetic energy of the feather as it
reaches the ground? Acceleration due to gravity is g = 9.8 m/s2.
66. Which does the law of conservation of energy describe?
Power and Work
67. A force of 100 N is used to move a table 2 m. How much work is done?
68. A boy performs 100 J of work pushing a box a distance of 4 m. How
much force does the boy use? Assume there is no friction.
69. A weight lifter performed 200 J of work lifting a weight in 2 seconds.
What was his power?
Kinetic – Work theorem
70. A box of mass 1 kg slides along the ice floor. It has an initial speed of 2
m/s but stops because of friction. How much work is done by friction?
Machines and efficiency
71. What are these machine used for?
- ncline plane
-screw
-level
-wheel and axle
72. If a pulley system has an efficiency of 81.8%. If you perform 1100 J of
work, how much useful work does the pulley perform?
Algebra & Units of Measurements
73. The equation for distance is d = st. If a car has a speed of 35 m/s for 15
seconds, how far does it go?
74. The voltage in a circuit is given by the equation V = IR. In this equation,
V is the voltage, I is the current, and R is the resistance. Which answer
shows this equation solved for current?
A.
B.
C.
D.
75. The force on an object is given by the equation F = ma. In this
equation, F is the force, m is the mass, and a is the acceleration. Which
answer shows this equation solved for mass?
A.
B.
C.
D.
76. The density of an object has the equation . If an object has a mass of
2.5 g and a volume of 1.3 cm3, what is its density?
77. What is the mass of an object that has a density of 1.3 g/cm 3 and a
volume of 2 cm3? (The density of an object has the equation
.)
78. The power in an electrical circuit is given by the equation P = I2R,
where I is the current flowing through the circuit and R is the resistance of
the circuit. What is the current in a circuit that has a resistance of 30 ohms
and a power of 2 watts?
79. A certain part of a computer chip has a length of 1.5 micrometers.
How many meters is this?
80. How is the number 3450 written in scientific notation?
81. You have 4 quarts of milk. How many liters is this? (1 quart equals about
0.946 L.)
Graphs
82. Approximately how many downloads were there between 3 p.m. and
4 p.m.?
83.Which point is labeled in the scatter plot below?
84. What is the slope of the line plotted below?
85. What are these graphs used for?
- Histogram
- Line graph
- Scatterplot
86.
Vector is plotted below. What is the length of the x-component of ?
87. What is the length of the x-component of the vector shown below?
88. A scientist working on synthesizing gold nanoparticle. The data shown
below are the size of gold nanoparticles.
32, 35, 40, 45, 50
What is the range of these data?
89. Explain why we should conduct an experiment more than once.
90. Explain why scientist must record number with significant number.
1 Dimensional motion
91. What is a scalar quantity?
92. What is vector quantity?
93. A car drives the path shown below.
In this diagram, each square represents 1 km. What is the displacement of
the car?
94.The graph below shows the position of a toy car over time, measured
using photogate?
At which point on the graph does the car have the highest instantaneous
velocity?
95. The graph below shows the velocity of a car as it attempts to set a
speed record.
At what point is the car the fastest?
96. A toy car's movement is measured using photogates. The car's
position-time graph is shown below.
Which of the following statements describes the velocity of this car?
97. What is the slope of position-time graph?
Relative motion
98. The diagram below shows the velocities of two cyclists.
From the frame of reference of cyclist 1, what is the velocity of cyclist 2?
99. A man stands still on a moving walkway that is going at a speed of 0.4
m/s to the east. What is the velocity of the man according to a stationary
observer?
100. What is frame reference point?
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