PHYSICS EXAM REVIEW

14. When you look at the speedometer in a moving car, you can see the car's a. Average distance traveled b. Instantaneous acceleration c. Average soeed d. Instantaneous soeed e. Average acceleration

D. Instantaneous Speed

78. An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the a. Arrow's push against the bowstring

a. Arrow's push against the bowstring

99. A cannon fires a cannonball. The speed of the cannonball will be the same speed of the recoiling cannon a. If the mass of the cannonball equals the mass of the cannon

a. If the mass of the cannonball equals the mass of the cannon

88. The momentum of an object is defined as the object's d. Mass times its acceleration

a. Mass times its acceleration

81. A force is exerted on the tires of a car to accelerate the car along the road. The force is exerted by the a. Road

a. Road

48. A bag of sports equipment has a mass of 10.0 kilograms and a weight of a. 0.98 N b. 9.8 N c. 98 N d. 980 N e. None of the above

c. 98 N

63. Which of the following would exert the most pressure on the ground? a. A woman standing in running shoes b. A woman standing on skis c. A woman standing in high-heel shoes

c. A woman standing in high-heel shoes

18. iIn the absence of air resistance, objects fall at a constant a. Speed b. Velocity c. Acceleration d. Distances each successive second e. All of the above

c. Acceleration

121. Which has greater kinetic energy, a car traveling 30 km/h or a half-as-massive car traveling at 60 km/h?

a. The 60 km/h car

92. A table tennis launcher is fires. Compared to the force on the ball, the force on the launcher is b. The same

b. The same

77. Force always occurs a. As single quantities b. By themselves c. In pairs d. In triplets

c. In pairs

128. Suppose a moving car has 3000 J of kinetic energy. If the car's speed doubles, how much kinetic energy will it then have. e. 12,000

e. 12,000

120. An object that has kinetic energy must have c. Momentum

120. An object that has kinetic energy must ave c. Momentum

A train travels 6 meters in the first second of travel, 6 meters again during the second second of travel, and 6 meters again during the third second. Its acceleration is a. 0 m/s2 b. 6 m/s2 c. 12 m/s2 d. 18 m/s2 e. None of the above.

A. 0 m/s2

6. Which of the following is a scientific hypothesis? a. Atoms are the smallest particle of matter that exist b. Albert Einstein is the greatest physicist of the twentieth century. c. The universe is surrounded by a second universe, which cannot be seen.

A. Atoms are the smallest particle of matter that exist.

22. A car accelerates 2 m/s2. Assuming the car starts from the rest, how much time does it need to accelerate to a speed of 20 m/s a. 2 seconds b. 10 seconds c. 20 seconds d. 40 seconds e. None of the above

B. 10 seconds

5. A theory is a. An educated guess that has yet to be proven by experiment. b. A synthesis of large collection of information including well tested guesses. c. Close agreement by competent observers of observations of the same phenomenon d. A guess that has been tested over and over again and always found to be true. e. A science story about atoms and molecules.

B. A synthesis of a a large collection of information including well-tested guesses.

133. If you whirl a tin can on the end of a string and the string suddenly breaks, the can will B. Fly off, tangent to its circular path.

B. Fly off, tangent to its circular path.

13. One possible unit of speed is A. Miles per hour B. Light years per century C. Kilometers per hour D. All of the above E. None of the above

D. All of the above

Speed is a. A measure of how fast something is b. Always measured in terms of a unit of distance divided by a unit of time. c. The distance covered per unit time. d. All of the above e. None of the above

D. All of the above

Acceleration is defined as a. Time it takes to move from one place to another place. b. Velocity of an object c. Distance divided by the time interval. d. Velocity divided by the time interval e. Time it takes to move from one speed to another speped

D. Velocity divided by the time interval.

10. The difference between a hypothesis and a theory is that a hypothesis is a a. Never true whereas a theory is always true. b. True whereas a theory is not true. c. An isolated fact whereas a theory is a huge collection of facts d. Never true whereas a theory is sometimes true. e. An educated guess whereas a theory has been tested successfully many times in many ways.

E. An educated guess whereas a theory has been tested successfully many times in many ways.

126. How much work is being done on a 60-N box of books that you carry horizontally across a 6-m room? a. 0 J

a. 0 J

57. A book weighs 4 N. When held at rest in your hands, the net force on your book is a. 0 N b. 0.4 N c. 4 N d. 39 N e. None of the above

a. 0 N

75. A 6-N falling object encounters 6 N of air resistance. The magnitude of the net force on the object is a. 0 N b. 6 N c. 12 N d. None of the above

a. 0 N

54. When an object reaches terminal velocity its acceleration is a. 0 m/s2 b. 4.9 m/s2 c. 9.8 m/2

a. 0 m/s2

60. A box is dragged without acceleration in a straight-line path cross a level surface by a force of 13 N. What is the frictional force between the box and the surface? a. 13 N b. Less than 13 N c. More than 13 N d. Need more information to say

a. 13 N

21. Suppose a car is moving in a straight line and steadily increases it speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the nest second. What is the car/s acceleration? a. 5 km/h-s b. 10 km/h-s c. 35 km/h-s d. 40 km/h-s e. 45 km/h-s

a. 5 km/h-s

28. Which of the following would NOT be considered a projectile? a. A cannonball thrown straight up b. A cannonball rolling down a slope c. A cannonball rolling off the edge of a table d. A cannonball thrown through the air e. All of the above are projectiles

a. A cannonball throwing straight up.

122. An object at rest may have a. Energy

a. Energy

51. Accelerations are produced by a. Forces b. Velocities c. Accelerations d. Masses e. None of the above

a. Forces

142. At the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height. Which ball hits the ground first a. Neither. They both hit the ground at the same time.

a. Neither. They both hit the ground at the same time

64. A tennis ball and a solid steel ball with the same diameter are dropped at the same time. Which ball has the greater force acting on it? a. The steel ball b. The tennis ball c. They both have the same force acting on them

a. The steel ball

89. Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour? a. Both have the same mometum

a. They both have the same momentum

83. Your friend says that the heavyweight champion of the world cannot exert a force of 95 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no wall, and no tricks. a. You agree that it can't be done

a. You agree that it can't be done

36. After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals a. Zero, since no force is necessary to keep it moving. b. Twice the force with which it was fired c. One half the force with which it was fired d. The same amount of force with which it was fired e. One quarter the force with which it was fired

a. Zero, since no force is necessary to keep it moving.

139. Which of the following does NOT represent Newton's second law? a. a = m/f

a. a = m/f

116. A woman can lift barrels a vertical distance of 1 meter or can roll them up a 2-meter long ramp to the same elevation. If she uses the ramp, the applied force required is b. 1/2 as much

b. 1/2 as much

129. It takes 80 J to push a large box 8 mm across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the force on the box? b. 10 N

b. 10 N

39. The mass of a sheep that weighs 110N is about a. 1 kg b. 11 kg c. 110 kg d. 1100 kg e. None of the above

b. 11 kg

58. A girl pulls on a 10-kg wagon with a constant force of 20 N. What is the wagons acceleration? a. 0.5 m/s2 b. 2 m/s2 c. 10 m/s2 d. 20 m/s2 e. 200 m/s2

b. 2 m/s2

56. Suppose the force of friction on a sliding object is 25 N. The force needed to maintain a constant velocity is a. more than 25 N b. 25 N c. less than 25 N

b. 25 N

66. If you pull horizontally on a desk with a force of 150 N and the desk doesn't move, the friction force must be 150 N. Now if you pull with 250 N so the desk slides at a constant velocity, the friction force is a. More than 150 N but less than 250 N b. 250 N c. More than 250 N

b. 250 N

131. A 60-N object moves at 1 m/s. Its kinetic energy is b. 3 J

b. 3 J

50. What is the minimum resultant possible when adding a 5-N force to an 8-N force? a. 5 N b. 3 N c. 8 N d. 13 N e. 40 N

b. 3 N

42. A 15-N force and a 45-N force act on an on onject in opposite directions. What is the net force on the object? a. 15 N b. 30 N c. 45 N d. 60 N e. None of the above

b. 30 N

102. A ball is moving at 6.0 m/s and has a momentum of 24.0 kg-m/s. What is the ball's mass? b. 4.0 kg

b. 4.0 kg

101. A 4.0-kg ball has a momentum of 20.0 kg-m/s. What is the ball's speed? b. 5.0 m/s

b. 5.0 m/s

24. If a projectile is fired straight up at a speed of 30 m/s, the total time to return to its starting point is about a. 3 second b. 6 seconds c. 30 seconds d. 60 seconds e. Not enough information to estimate.

b. 6 seconds

20. Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is. a. 30 km/h b. 60 km/h c. 180 km/h d. 360 km/h e. 540 km/h

b. 60 km/h

19. Suppose an object is in free fall. Each second the object falls a. The same distance as in the second before b. A larger distance than in the second before c. With the same instantaneous speed. d. With the same average speed. e. None of the above

b. A larger distance than in the second before.

69. You are on a frozen pond, and the ice starts to crack. If you lie down on the ice and begin to crawl, this will a. Increase the pressure o the ice b. Decrease the pressure on the ice c. Increase the total force on the ice d. Decrease the total force on the ice

b. Decrease the pressure on the ice

138. Analyze the collision of a baseball with a bat. During which portion of the collision does the baseball's velocity reach zero? b. During the collison

b. During the collision

98. Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a higher b. Momentum

b. Momentum

62. The unit of pressure is a. Newtons per meter b. Newtons per square meter (or pascals) c. The newton d. The meter e. Meters per second squared

b. Newtons per square meter (or pascals)

82. A rocket is able to accelerate in the vacuum of space when it fires its engines. The force that propels the rocket is the force b. Of the exhaust gases on the rocket

b. Of the exhaust gases on the rocket.

110. Kinetic energy of an object is equal to b. One half the product of its mass times its speed squared

b. One half the product of its mass times its speed squared

44. Friction is a force that always acts a. Perpendicular to an object's motions b. Opposite to an objects motion c. In the same direction as an objects motion

b. Opposite to an objects motion

117. A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work but different amounts of b. Power

b. Power

32. The astronomer Copernicus publicly stated in the 1500s that Earth a. Does not move b. Revolves around the sun c. Is slowing down d. Moves in a straight line e. Is the center of the solar system

b. Revolves around the sun

97. A cannon recoils from launching a cannonball. The speed of the cannon's recoil is small because the b. The cannon has far more mass than the cannonball.

b. The canon has far more mass than the cannonball.

33. Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane a. The ball would not roll up the other place at all b. To nearly its original height c. To about one quarter its original e. To nearly half its original height

b. To nearly its original height

144. A cannonball is launched from the ground at an angle of 30 derees above the horizontal and a speed of 30m/s. Ideally (no air resistance) the ball will land on the ground with a speed of c. 30 m/s

c 30 m/s

70. A 20-N falling object encounters a 4 N of air resistance. The magitude of the net force on the object is a. 0 N b. 4 N c. 16 N d. 20 N e. None of the above

c. 16 N

72. A tow truck exerts a force of 2000 N on a car, accelerating it at 1 m/s/s. What is the mass of the car? a. 667 kg b. 1000 kg c. 2000 kg d. 8000 kg e. None of the above

c. 2000 kg

55. When a woman stands with two feet on a scale, the scale reads 280 N. When she lifts one foot, the scale reads a. less than 280 N b. more than 290 N c. 280 N

c. 280 N

30. In the absence of air resistance, the angle at which a thrown ball will go farthest is a. 15 degrees b. 30 degrees c. 45 degrees d. 60 degrees e. 75 degrees

c. 45 degrees

87. Suppose two people, one having three times the mass of the other, pull on opposite sides of a 20-meter rope while on frictionless ice. After a brie time, they meet. The more massive person slides a distance of c. 6m

c. 6 m

23. A freely falling object starts from rest. After falling for 6 seconds, it will have a speed of about a. 6 m/s b. 30 m/s c. 60 m/s d. 300 m/s e. More than 300 m/s

c. 60 m/s

17. A car starts from rest ad after 7 seconds, it is moving at 42 m/s. What is the car's average acceleration? a. 0.17 m/s2 b. 1.67 m/s2 c. 6 m/s2 d. 7 m/s2 e. None of the above

c. 6m/s2

31. Which best approximates the resultant of a pair of 6-unit vectors at right angles to each other? a. 0 units b. 6 units c. 8 units d. 12 units

c. 8 units

112. Energy is changed from one form to another with no net loss or gain c. Always true

c. Always true

143. At what part of a path does a projectile have minimum speed? c. At the top of its path

c. At the top of its path

35. The law of inertia applies to a. Objects at rest b. Moving objects c. Both moving and nonmoving objects

c. Both moving and nonmoving objects

118. Which requires more work: lifting a 70-g sack vertically 20 meters or lifting a 35-kg sack vertically 4 meters?

c. Both require the same amount of work.

3. A scientific fact is a. Something you believe is true because you have been taught it. b. A guess that has been tested over and over again and always found to be true. c. Close agreement by competent observers of observations of the same phenomena. d. An educated guess that has yet to be proved by experiment e. A Synthesis of a collection of data that includes well tested guesses.

c. Close agreement by competent observers of observations of the same phenomenon.

115. Rockets are launched from an airplane in the forward direction of motion. The kinetic energy of the airplane will be c. Decreased

c. Decreased

106. If Nellie Newton pushes an object with twice the force for twice the distance, she does c. Four times the work

c. Four times the work

80. According to Newton's third law, if you push gently on something, it will push c. Gently on you

c. Gently on you

40. An object following a straight line path at constant speed a. Has no forces acting on it b. Has a net force acting on it in the direction of motion c. Has zero acceleration d. Must be moving in a vaccum e. None of the above

c. Has zero acceleration

38. One object has twice as much mass as another object. The first object also has twice as much a. Velocity b. Gravitational acceleration c. Inertia d. All of the above

c. Inertia

52. How does the acceleration of a object change in relation to its mass? It is a. Directly proportional b. Acceleration doesn't depend on mass at all c. Inversely proportional

c. Inversely proportional

107. The unit of work is the c. Joule

c. Joule

108. Potential energy is the energy an object has because of its c. Location

c. Location

25. A vector is a quantity that has a. Magnitude and time b. Time and direction c. Magnitude and direction

c. Magnitude and direction

124. If the velocity of a moving object doubles, then what else doubles c. Momentum

c. Momentum

140. When an object is in equilibrium, the net force is c. Negative

c. Negative

46. Which has more mass, a kilogram of feathers, or a kilogram of iron? a. The feathers b. The iron c. Neither - they both have the same mass

c. Neither - they both have the same mass.

130. If Kelly the skater's speed increases so he has three times the momentum, then his kinetic energy increases by c. Nine times

c. Nine times

137. A rocket leaves a launch pad at liftoff with a great deal of upward momentum. What was initially given downward momentum? c. The expended fuel

c. The expended fuel

79. A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. What is the reaction of this force? b. The force the glove exerts on the ball

c. The force the glove exerts on the ball

37. A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The reason this can be done is that a. Gravity pulls every hard on the milk carton b. The milk carton has very little weight c. The milk carton has inertia d. None of the above

c. The milk carton has inertia

59. A force of 3 N accelerates a mass of 3 kg at the rate of 1 m/s2. The acceleration of mass of 6 kg acted upon by a force of 6N is a. Twice as much b. Half as much c. The same d. None of the above

c. The same

29. The horizontal component of a projectile's velocity as independent of a. The range of the projectile b. Time c. The vertical component of its velocity.

c. The vertical component of its velocity.

109. The amount of potential energy possessed by an elevated object is equal to c. The work done in lifting it

c. The work done in lifting it

65. A tennis ball and a steel ball with the same diameter are dropped at the same time. IN THE ABSENCE OF AIR RESISTANCE, which ball has the greatest acceleration? a. The steel ball b. The tennis ball c. They both have the same acceleration

c. They both have the same acceleration

135. What is the correct definition of momentum, P= c. mv

c. mv

45. What is the maximum resultant possible when adding a 2-N force to an 8-N force? a. 2 N b. 6 N c. 8 N d. 10 N e. 16 N

d. 10 N

73. A jet has aa mass of 40,000 kg. The thrust for each of the four engines is 20,000 N. What is the jet's acceleration when taking off? a. 0.3 m/s2 b. 0.5 m/s2 c. 1 m/s2 d. 2 m/s2 e. None of the above

d. 2 m/s2

47. How much does a 3.0kg bag of bolts way? a. 7.2 N b. 14.4 N c. 22.8 d. 29.4 e. 58.8

d. 29.4

49. A 5-N force and a 30-N force act in the same direction o an object. What is the net force on the object? a. 5 N b. 25 N c. 30 N d. 35 N e. None of the above

d. 35 N

111. An arrow in a bow has 70 J of potential energy. Assume no loss of energy to heat, how much kinetic energy will it have after it has been shot? d. 70 J

d. 70 J

74. How much force is needed to accelerate 4.0-kg physics book to an acceleration of 2.0 m/s2? a. 0 N b. 2.0 N c. 0.5 N d. 8.0 N e. 24.0 N

d. 8.0 N

86. Two people pull on a rope in tug of war. Each pulls with 400 N of force. What is the tension in the rope? d. 800 N

d. 800 N

95. Which of the following has the largest momentum? d. A pickup truck traveling down the highway.

d. A pickup truck traveling down the highway.

136. Which conditions will result in the smallest change in momentum d. A small force over a short period of time

d. A small force over a short period of time

27. When representing a velocity as a vector a. The direction of the arrow dhows the direction of motion b. The length of the arrow represents the speed c. The length of the arrow is drawn to a suitable scale d. All of the above e. None of the above

d. All of the above

41. Friction a. Comes from microscopic bumps that act as obstructions to the objects motion b. Is the name given to the force acting between surfaces sliding past one aother c. Acts in a direction that opposes the motion of an object d. All of the above e. None of the above

d. All of the above

91. If the momentum of an object changes and its mass remains constant, a. It is accelerating (or decelerating) b. There is a force acting on it c. Its velocity is changing d. All of the above e. None of the above

d. All of the above

96. A freight train rolls along the track with considerable momentum. If it were to roll at the same speed but had twice as much mass, its momentum would be d. Doubled

d. Doubled

61. Pressure is defined as a. Time per area b. Velocity per time c. Force per time d. Force per area e. Distance per time

d. Force per area

114. When a car's speed triples, its kinetic energy d. Increases by nine times

d. Increases by nine times

134. Which gives the correct relationship for kinetic energy? d. KE = mv(2)/2

d. KE = mv(2)/2

141. When the drag force on an object falling through the air equals the force of gravity, the object has reached d. Terminal velocity

d. Terminal Velocity

132. A tin whirled on the ed of a string moves in circles because d. There is an inward force acting on the can

d. There is an inward force acting on the can

94. Suppose a girl is standing on a pond where there is no friction between her feet and the ice. In order to get off the ice, she can d. Throw something in the direction opposite to the way she wants to go.

d. Throw something in the direction opposite to the way she wants to go

53. The acceleration produced by a net force on an object is a. Inversely proportional to the mass of the object b. Directly proportional to the magnitude of the net force c. In the same direction as the net force d. All of the above e. None of the above

d. all of the above

71. A sportscar has a mass of 1500 kg and accelerates at 5 meters per second squared. What is the magnitude of the force acting on the sportscar? a. 400 N b. 1500 N c. 2250 N d. 2250 N e. 7500 N

e. 7500 N

113. As a pendulum swings back and forth a. At the end points of it swings, its energy is all potential b. At the lowest point of its swing, it's energy is all kinetic c. Kinetic energy is transformed into potential energy d. Potential energy is transformed into kinetic energy e. All of the above

e. All of the above

43. Equilibrium occurs when a. All the forces acting on an object are balanced b. The sum of the +x forces on an object equals the sum of the -x forces. c. The net force on the object is zero d. The sum of the upward forces equals the sum of the downward forces e. All of the above

e. All of the above

93. A collision is considered elastic if a. There is no lasting deformation b. The objects don't stick together c. The objects that collide don't get warmer d. After the collision, the objects have the same shape as before the collision. e. All of the above

e. All of the above

103. In physics, work is defined as e. Force times distance

e. Force times distance

34. The law of inertia states that an object a. Will continue moving at the same velocity unless an outside force acts on it b. Will continue moving in a straight line unless an outside force acts on it. c. That is not moving will never move unless a force acts on it d. At rest will remain at rest e. Will do all of the above

e. Will do all of the above