Question 1

A book rests on a table, exerting a downward force on the table. The reaction to this force is:

Accepted Answer

A)  the force of the Earth on the book 
B)  the force of the table on the book 
C)  the force of the Earth on the table 
D)  the force of the book on the Earth 
E)  the inertia of the book 
A)  the force of the Earth on the book 
B)  the force of the table on the book 
C)  the force of the Earth on the table 
D)  the force of the book on the Earth 
E)  the inertia of the book

Question 2

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

Question 3

An object placed on an equal-arm balance requires 12 kg to balance it. When placed on a spring scale, the scale reads 12 kg. Everything (balance, scale, set of weights and object) is now transported to the Moon where free-fall acceleration is one-sixth that on Earth. The new readings of the balance and spring scale (respectively) are:

Accepted Answer

A)  12 kg, 12 kg 
B)  2 kg, 2 kg 
C)  12 kg, 2 kg 
D)  2 kg, 12 kg 
E)  12 kg, 72 kg 
A)  12 kg, 12 kg 
B)  2 kg, 2 kg 
C)  12 kg, 2 kg 
D)  2 kg, 12 kg 
E)  12 kg, 72 kg

Question 4

A heavy ball is suspended as shown. A quick jerk on the lower string will break that string but a slow pull on the lower string will break the upper string. The first result occurs because:

Accepted Answer

A)  the force is too small to move the ball 
B)  action and reaction is operating 
C)  the ball has inertia 
D)  air friction holds the ball back 
E)  the ball has too much energy 
A)  the force is too small to move the ball 
B)  action and reaction is operating 
C)  the ball has inertia 
D)  air friction holds the ball back 
E)  the ball has too much energy

Question 5

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

Accepted Answer

A)  980 
B)  566 
C)  849 
D)  zero 
E)  490 
A)  980 
B)  566 
C)  849 
D)  zero 
E)  490

Question 6

A heavy steel ball B is suspended by a cord from a block of wood W. The entire system is dropped through the air. Neglecting air resistance, the tension in the cord is:

Accepted Answer

A)  zero 
B)  the difference in the masses of B and W 
C)  the difference in the weights of B and W 
D)  the weight of B 
E)  none of these 
A)  zero 
B)  the difference in the masses of B and W 
C)  the difference in the weights of B and W 
D)  the weight of B 
E)  none of these

Question 7

Equal forces   act on isolated bodies A and B. The mass of B is three times that of A. The magnitude of the acceleration of A is:

Accepted Answer

A)  three times that of B 
B)  1/3 that of B 
C)  the same as B 
D)  nine times that of B 
E)  1/9 that of B 
A)  three times that of B 
B)  1/3 that of B 
C)  the same as B 
D)  nine times that of B 
E)  1/9 that of B

Question 8

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 Earth 
A)  string on the block 
B)  block on the string 
C)  string on the hand 
D)  hand on the string 
E)  block on the Earth

Question 9

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30   above the horizontal. The mass of the crate is:

Accepted Answer

A)  3.3 kg 
B)  3.8 kg 
C)  5.7 kg 
D)  6.5 kg 
E)  160 kg 
A)  3.3 kg 
B)  3.8 kg 
C)  5.7 kg 
D)  6.5 kg 
E)  160 kg

Question 10

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 object 
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 object

Question 11

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 above 
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 above

Question 12

A newton is the force:

Accepted Answer

A)  of gravity on a 1 kg body 
B)  of gravity on a 1 g body 
C)  that gives a l g body an acceleration of 1 cm/s2 
D)  that gives a 1 kg body an acceleration of 1 m/s2 
E)  that gives a 1 kg body an acceleration of 9.8 m/s2 
A)  of gravity on a 1 kg body 
B)  of gravity on a 1 g body 
C)  that gives a l g body an acceleration of 1 cm/s2 
D)  that gives a 1 kg body an acceleration of 1 m/s2 
E)  that gives a 1 kg body an acceleration of 9.8 m/s2

Question 13

A 1-N pendulum bob is held at an angle $\theta$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 $\theta$ 
B)  2/cos $\theta$ 
C)    
D)  1 
E)  none of these 
A)  cos $\theta$ 
B)  2/cos $\theta$ 
C)    
D)  1 
E)  none of these

Question 14

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

Question 15

When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20   below the horizontal, the magnitude of the normal force of the floor on the crate is:

Accepted Answer

A)  25 N 
B)  68 N 
C)  180 N 
D)  250 N 
E)  310 N 
A)  25 N 
B)  68 N 
C)  180 N 
D)  250 N 
E)  310 N

Question 16

A 25-kg crate is pushed across a frictionless horizontal floor with a force of 20 N, directed   below the horizontal. The acceleration of the crate is:

Accepted Answer

A)  0.27 m/s2 
B)  0.75 m/s2 
C)  0.80 m/s2 
D)  170 m/s2 
E)  470 m/s2 
A)  0.27 m/s2 
B)  0.75 m/s2 
C)  0.80 m/s2 
D)  170 m/s2 
E)  470 m/s2

Question 17

The term "mass" refers to the same physical concept as:

Accepted Answer

A)  weight 
B)  inertia 
C)  force 
D)  acceleration 
E)  volume 
A)  weight 
B)  inertia 
C)  force 
D)  acceleration 
E)  volume

Question 18

When a 40-N force, parallel to the incline and directed up the incline, is applied to a crate on a frictionless incline that is 30   above the horizontal, the acceleration of the crate is 2.0 m/s2, up the incline. The mass of the crate is:

Accepted Answer

A)  3.8 kg 
B)  4.1 kg 
C)  5.8 kg 
D)  6.2 kg 
E)  10 kg 
A)  3.8 kg 
B)  4.1 kg 
C)  5.8 kg 
D)  6.2 kg 
E)  10 kg

Question 19

A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s2. The tension in the cable is:

Accepted Answer

A)  4900 N 
B)  11,000 N 
C)  16,000 N 
D)  21,000 N 
E)  48,000 N 
A)  4900 N 
B)  11,000 N 
C)  16,000 N 
D)  21,000 N 
E)  48,000 N

Question 20

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

Exam 5: Force and Motion I

A book rests on a table, exerting a downward force on the table. The reaction to this force is:

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

A heavy ball is suspended as shown. A quick jerk on the lower string will break that string but a slow pull on the lower string will break the upper string. The first result occurs because:

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

A heavy steel ball B is suspended by a cord from a block of wood W. The entire system is dropped through the air. Neglecting air resistance, the tension in the cord is:

Equal forces act on isolated bodies A and B. The mass of B is three times that of A. The magnitude of the acceleration of A is:

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:

A 32-N force, parallel to the incline, is required to push a certain crate at constant velocity up a frictionless incline that is 30 above the horizontal. The mass of the crate is:

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

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:

A newton is the force:

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:

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

When a 25-kg crate is pushed across a frictionless horizontal floor with a force of 200 N, directed 20 below the horizontal, the magnitude of the normal force of the floor on the crate is:

A 25-kg crate is pushed across a frictionless horizontal floor with a force of 20 N, directed 20 below the horizontal. The acceleration of the crate is:

The term "mass" refers to the same physical concept as:

When a 40-N force, parallel to the incline and directed up the incline, is applied to a crate on a frictionless incline that is 30 above the horizontal, the acceleration of the crate is 2.0 m/s2, up the incline. The mass of the crate is:

A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s2. The tension in the cable is:

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:

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

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

When a 40-N force, parallel to the incline and directed up the incline, is applied to a crate on a frictionless incline that is 30 above the horizontal, the acceleration of the crate is 2.0 m/s², up the incline. The mass of the crate is:

A crane operator lowers a 16,000 N steel ball with a downward acceleration of 3 m/s². The tension in the cable is:

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: