Question 1

Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the west. The magnitude of the acceleration of the crate is:

Accepted Answer

A)   0.50 m/s2
B)   2.0 m/s2
C)   2.8 m/s2
D)   10 m/s2
E)   50 m/s2F) C) and D)
G) B) and E)

Question 2

The "reaction" force does not cancel the "action" force because:

Accepted Answer

A)   the action force is greater than the reaction force
B)   they are on different bodies
C)   they are in the same direction
D)   the reaction force exists only after the action force is removed
E)   the reaction force is greater than the action forceF) C) and D)
G) A) and C)

Question 3

A heavy wooden block is dragged by a force  along a rough steel plate, as shown below for two cases. The magnitude of the applied force  is the same for both cases. The normal force in (ii) , as compared with the normal force in (i)  is:

Accepted Answer

A)   the same
B)   greater
C)   less
D)   less for some angles of the incline and greater for others
E)   less or greater, depending on the magnitude of the applied force F) A) and E)
G) C) and D)

Question 4

A man weighing 700 Nb is in an elevator that is accelerating upward at 4 m/s2. The force exerted on him by the elevator floor is:

Accepted Answer

A)   71 N
B)   290 N
C)   410 N
D)   700 N
E)   990 NF) B) and C)
G) B) and E)

Question 5

A 9000-N automobile is pushed along a level road by four students who apply a total forward force of 500 N. Neglecting friction, the acceleration of the automobile is:

Accepted Answer

A)   0.055m/s2
B)   0.54 m/s2
C)   1.8 m/s2
D)   9.8 m/s2
E)   18 m/s2F) B) and E)
G) C) and D)

Question 6

A 1-N pendulum bob is held at an angle  θ	hetaθ from the vertical by a 2-N horizontal force F as shown. The tension in the string supporting the pendulum bob (in newtons)  is:

Accepted Answer

A)   cos  θ	hetaθ 
B)   2/cos  θ	hetaθ 
C)   
D)   1
E)   none of these F) B) and C)
G) B) and D)

Question 7

A 6-kg object is moving south. A net force of 12 N north on it result in the object having an acceleration of:

Accepted Answer

A)   2 m/s2, north
B)   2 m/s2, south
C)   6 m/s2, north
D)   18 m/s2, north
E)   18 m/s2, southF) A) and B)
G) C) and E)

Question 8

The block shown moves with constant velocity on a horizontal surface. Two of the forces on it are shown. A frictional force exerted by the surface is the only other horizontal force on the block. The frictional force is:

Accepted Answer

A)   0
B)   2 N, leftward
C)   2 N, rightward
D)   slightly more than 2 N, leftward
E)   slightly less than 2 N, leftwardF) C) and E)
G) B) and E)

Question 9

A 1000-kg elevator is rising and its speed is increasing at 3 m/s2. The tension in the elevator cable is:

Accepted Answer

A)   6800 N
B)   1000 N
C)   3000 N
D)   9800 N
E)   12800 NF) B) and E)
G) D) and E)

Question 10

Two forces, one with a magnitude of 3 N and the other with a magnitude of 5 N, are applied to an object. For which orientations of the forces shown in the diagrams is the magnitude of the acceleration of the object the least?

Accepted Answer

A)   I
B)   II
C)   III
D)   IV
E)   VF) C) and D)
G) A) and B)

Question 11

An example of an inertial reference frame is:

Accepted Answer

A)   any reference frame that is not accelerating
B)   a frame attached to a particle on which there are no forces
C)   any reference frame that is at rest
D)   a reference frame attached to the center of the universe
E)   a reference frame attached to the EarthF) D) and E)
G) All of the above

Question 12

A 5-kg block is suspended by a rope from the ceiling of an elevator accelerates downward at 3.0 m/s2. The tension force of the rope on the block is:

Accepted Answer

A)   15 N, up
B)   34 N, up
C)   34 N, down
D)   64 N, up
E)   64 N, downF) B) and E)
G) A) and B)

Question 13

A 13-N weight and a 12-N weight are connected by a massless string over a massless, frictionless pulley. The 13-N weight has a downward acceleration with magnitude equal to that of a freely falling body times:

Accepted Answer

A)   1
B)   1/12
C)   1/13
D)   1/25
E)   13/25F) None of the above
G) A) and C)

Question 14

The standard 1-kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6 m/s2, the force of the spring has a magnitude of:

Accepted Answer

A)   2.8 N
B)   5.6 N
C)   11.2 N
D)   0
E)   an undetermined amountF) B) and C)
G) A) and B)

Question 15

In SI units a force is numerically equal to the ______, when the force is applied to it.

Accepted Answer

A)   velocity of the standard kilogram
B)   speed of the standard kilogram
C)   velocity of any object
D)   acceleration of the standard kilogram
E)   acceleration of any objectF) B) and D)
G) B) and C)

Question 16

A block slides down a frictionless plane that makes an angle of 30 °\degree°  with the horizontal. The acceleration of the block (in cm/s2)  is:

Accepted Answer

A)   980
B)   566
C)   849
D)   zero
E)   490 F) A) and B)
G) C) and D)

Question 17

A circus performer of weight W is walking along a "high wire" as shown. The tension in the wire is:

Accepted Answer

A)   approximately W
B)   approximately W/2
C)   much less than W
D)   much more than W
E)   depends on whether he stands on one or two feetF) A) and B)
G) A) and C)

Question 18

A 400-N steel ball is suspended by a light rope frome the ceiling.. The tension in the rope is:

Accepted Answer

A)   400 N
B)   800 N
C)   zero
D)   200 N
E)   560 NF) D) and E)
G) C) and D)

Question 19

A lead block is suspended from your hand by a string. The reaction to the force of gravity on the block is the force exerted by the:

Accepted Answer

A)   string on the block
B)   block on the string
C)   string on the hand
D)   hand on the string
E)   block on the EarthF) B) and D)
G) None of the above

Question 20

Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because:

Accepted Answer

A)   anything falling in vacuum has constant velocity
B)   all objects reach the same terminal velocity
C)   the acceleration of the larger object is three times greater than that of the smaller object
D)   the force of gravity is the same for both objects
E)   none of the aboveF) B) and C)
G) A) and E)

Exam 5: Force and Motion I

Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the west. The magnitude of the acceleration of the crate is:

Correct Answer
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Correct Answer
verified

Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because:

Correct Answer
verified

A block slides down a frictionless plane that makes an angle of 30 $\degree$ with the horizontal. The acceleration of the block (in cm/s²) is:

Correct Answer
verified

The block shown moves with constant velocity on a horizontal surface. Two of the forces on it are shown. A frictional force exerted by the surface is the only other horizontal force on the block. The frictional force is:

Correct Answer
verified

A 1000-kg elevator is rising and its speed is increasing at 3 m/s². The tension in the elevator cable is:

Correct Answer
verified

In SI units a force is numerically equal to the ______, when the force is applied to it.

Correct Answer
verified

A lead block is suspended from your hand by a string. The reaction to the force of gravity on the block is the force exerted by the:

Correct Answer
verified

A heavy wooden block is dragged by a force along a rough steel plate, as shown below for two cases. The magnitude of the applied force is the same for both cases. The normal force in (ii) , as compared with the normal force in (i) is:

Correct Answer
verified

The "reaction" force does not cancel the "action" force because:

Correct Answer
verified

A 5-kg block is suspended by a rope from the ceiling of an elevator accelerates downward at 3.0 m/s². The tension force of the rope on the block is:

Correct Answer
verified

The standard 1-kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6 m/s², the force of the spring has a magnitude of:

Correct Answer
verified

A 9000-N automobile is pushed along a level road by four students who apply a total forward force of 500 N. Neglecting friction, the acceleration of the automobile is:

Correct Answer
verified

Two forces, one with a magnitude of 3 N and the other with a magnitude of 5 N, are applied to an object. For which orientations of the forces shown in the diagrams is the magnitude of the acceleration of the object the least?

Correct Answer
verified

An example of an inertial reference frame is:

Correct Answer
verified

A 6-kg object is moving south. A net force of 12 N north on it result in the object having an acceleration of:

Correct Answer
verified

A circus performer of weight W is walking along a "high wire" as shown. The tension in the wire is:

Correct Answer
verified

A man weighing 700 Nb is in an elevator that is accelerating upward at 4 m/s². The force exerted on him by the elevator floor is:

Correct Answer
verified

A 13-N weight and a 12-N weight are connected by a massless string over a massless, frictionless pulley. The 13-N weight has a downward acceleration with magnitude equal to that of a freely falling body times:

Correct Answer
verified

A 400-N steel ball is suspended by a light rope frome the ceiling.. The tension in the rope is:

Correct Answer
verified

Exam 5: Force and Motion I

Two forces are applied to a 5.0-kg crate; one is 6.0 N to the north and the other is 8.0 N to the west. The magnitude of the acceleration of the crate is:

Correct AnswerverifiedShow Answer

A 1-N pendulum bob is held at an angle θ\thetaθ from the vertical by a 2-N horizontal force F as shown. The tension in the string supporting the pendulum bob (in newtons) is:

Correct AnswerverifiedShow Answer

Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because:

Correct AnswerverifiedShow Answer

A block slides down a frictionless plane that makes an angle of 30 °\degree° with the horizontal. The acceleration of the block (in cm/s2) is:

Correct AnswerverifiedShow Answer

The block shown moves with constant velocity on a horizontal surface. Two of the forces on it are shown. A frictional force exerted by the surface is the only other horizontal force on the block. The frictional force is:

Correct AnswerverifiedShow Answer

A 1000-kg elevator is rising and its speed is increasing at 3 m/s2. The tension in the elevator cable is:

Correct AnswerverifiedShow Answer

In SI units a force is numerically equal to the ______, when the force is applied to it.

Correct AnswerverifiedShow Answer

A lead block is suspended from your hand by a string. The reaction to the force of gravity on the block is the force exerted by the:

Correct AnswerverifiedShow Answer

A heavy wooden block is dragged by a force along a rough steel plate, as shown below for two cases. The magnitude of the applied force is the same for both cases. The normal force in (ii) , as compared with the normal force in (i) is:

Correct AnswerverifiedShow Answer

The "reaction" force does not cancel the "action" force because:

Correct AnswerverifiedShow Answer

A 5-kg block is suspended by a rope from the ceiling of an elevator accelerates downward at 3.0 m/s2. The tension force of the rope on the block is:

Correct AnswerverifiedShow Answer

The standard 1-kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6 m/s2, the force of the spring has a magnitude of:

Correct AnswerverifiedShow Answer

A 9000-N automobile is pushed along a level road by four students who apply a total forward force of 500 N. Neglecting friction, the acceleration of the automobile is:

Correct AnswerverifiedShow Answer

Two forces, one with a magnitude of 3 N and the other with a magnitude of 5 N, are applied to an object. For which orientations of the forces shown in the diagrams is the magnitude of the acceleration of the object the least?

Correct AnswerverifiedShow Answer

An example of an inertial reference frame is:

Correct AnswerverifiedShow Answer

A 6-kg object is moving south. A net force of 12 N north on it result in the object having an acceleration of:

Correct AnswerverifiedShow Answer

A circus performer of weight W is walking along a "high wire" as shown. The tension in the wire is:

Correct AnswerverifiedShow Answer

A man weighing 700 Nb is in an elevator that is accelerating upward at 4 m/s2. The force exerted on him by the elevator floor is:

Correct AnswerverifiedShow Answer

A 13-N weight and a 12-N weight are connected by a massless string over a massless, frictionless pulley. The 13-N weight has a downward acceleration with magnitude equal to that of a freely falling body times:

Correct AnswerverifiedShow Answer

A 400-N steel ball is suspended by a light rope frome the ceiling.. The tension in the rope is:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A block slides down a frictionless plane that makes an angle of 30 $\degree$ with the horizontal. The acceleration of the block (in cm/s²) is:

Correct Answer
verified

Correct Answer
verified

A 1000-kg elevator is rising and its speed is increasing at 3 m/s². The tension in the elevator cable is:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A 5-kg block is suspended by a rope from the ceiling of an elevator accelerates downward at 3.0 m/s². The tension force of the rope on the block is:

Correct Answer
verified

The standard 1-kg mass is attached to a compressed spring and the spring is released. If the mass initially has an acceleration of 5.6 m/s², the force of the spring has a magnitude of:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A man weighing 700 Nb is in an elevator that is accelerating upward at 4 m/s². The force exerted on him by the elevator floor is:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified