Question 1

A 5-kg block is suspended by a rope from the ceiling of an elevator that 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, down 
A) 15 N, up 
B) 34 N, up 
C) 34 N, down 
D) 64 N, up 
E) 64 N, down

Question 2

A crate rests on a horizontal surface and a woman pulls on it with a 10-N force.Rank the situations shown below according to the magnitude of the normal force exerted by the surface on the crate, least to greatest.

Accepted Answer

A) 1, 2, 3 
B) 2, 1, 3 
C) 2, 3, 1 
D) 1, 3, 2 
E) 3, 2, 1 
A) 1, 2, 3 
B) 2, 1, 3 
C) 2, 3, 1 
D) 1, 3, 2 
E) 3, 2, 1

Question 3

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 N 
E) an undetermined amount 
A) 2.8 N 
B) 5.6 N 
C) 11.2 N 
D) 0 N 
E) an undetermined amount

Question 4

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

Accepted Answer

A) 9.80 m/s2 
B) 5.66 m/s2 
C) 8.49 m/s2 
D) 0 m/s2 
E) 4.90 m/s2 
A) 9.80 m/s2 
B) 5.66 m/s2 
C) 8.49 m/s2 
D) 0 m/s2 
E) 4.90 m/s2

Question 5

You stand on a spring scale on the floor of an elevator.Of the following, the scale shows the highest reading when the elevator:

Accepted Answer

A) moves downward with increasing speed 
B) moves downward with decreasing speed 
C) remains stationary 
D) moves upward with decreasing speed 
E) moves upward at constant speed 
A) moves downward with increasing speed 
B) moves downward with decreasing speed 
C) remains stationary 
D) moves upward with decreasing speed 
E) moves upward at constant speed

Question 6

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 orientation 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) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 7

The inertia of a body tends to cause the body to:

Accepted Answer

A) speed up 
B) slow down 
C) resist any change in its motion 
D) fall toward the Earth 
E) decelerate due to friction 
A) speed up 
B) slow down 
C) resist any change in its motion 
D) fall toward the Earth 
E) decelerate due to friction

Question 8

Which of the following is true, according to Newton's second law?

Accepted Answer

A) The acceleration of an object is proportional to its mass and inversely proportional to the net force on it. 
B) The acceleration of an object is proportional to the product of its mass and the net force on it. 
C) The acceleration of an object is proportional to the net force on it and inversely proportional to its mass. 
D) The acceleration of an object is equal to the net force on it. 
E) The acceleration of an object depends on all the forces on it, both internal and external. 
A) The acceleration of an object is proportional to its mass and inversely proportional to the net force on it. 
B) The acceleration of an object is proportional to the product of its mass and the net force on it. 
C) The acceleration of an object is proportional to the net force on it and inversely proportional to its mass. 
D) The acceleration of an object is equal to the net force on it. 
E) The acceleration of an object depends on all the forces on it, both internal and external.

Question 9

Three books (X, Y, and Z)rest on a table.The weight of each book is indicated.The net force acting on book Y is:

Accepted Answer

A) 4 N down 
B) 5 N up 
C) 9 N down 
D) 0 N 
E) none of these 
A) 4 N down 
B) 5 N up 
C) 9 N down 
D) 0 N 
E) none of these

Question 10

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

Accepted Answer

A) the action force is greater than the reaction force 
B) they act 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 force 
A) the action force is greater than the reaction force 
B) they act 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 force

Question 11

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

Question 12

A 5-kg concrete block is lowered with a downward acceleration of 2.8 m/s2 by means of a rope.The force of the block on the Earth is:

Accepted Answer

A) 14 N, up 
B) 14 N, down 
C) 35 N, up 
D) 35 N, down 
E) 49 N, up 
A) 14 N, up 
B) 14 N, down 
C) 35 N, up 
D) 35 N, down 
E) 49 N, up

Question 13

A short 10-g string is used to pull a 50-g toy across a frictionless horizontal surface.If a 3.0 *10-2 N force is applied horizontally to the free end of the string, the force of the string on the toy, at the other end, is:

Accepted Answer

A) 0.15 N 
B) 6.0 *10-3 N 
C) 2.5 *10-2 N 
D) 3.0 * 10-2 N 
E) 3.5 *10-2 N 
A) 0.15 N 
B) 6.0 *10-3 N 
C) 2.5 *10-2 N 
D) 3.0 * 10-2 N 
E) 3.5 *10-2 N

Exam 5: Force and Motion I

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

A crate rests on a horizontal surface and a woman pulls on it with a 10-N force.Rank the situations shown below according to the magnitude of the normal force exerted by the surface on the crate, least to greatest.

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:

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

You stand on a spring scale on the floor of an elevator.Of the following, the scale shows the highest reading when the elevator:

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 orientation of the forces shown in the diagrams is the magnitude of the acceleration of the object the least?

The inertia of a body tends to cause the body to:

Which of the following is true, according to Newton's second law?

Three books (X, Y, and Z)rest on a table.The weight of each book is indicated.The net force acting on book Y is:

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

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:

A 5-kg concrete block is lowered with a downward acceleration of 2.8 m/s2 by means of a rope.The force of the block on the Earth is:

A short 10-g string is used to pull a 50-g toy across a frictionless horizontal surface.If a 3.0 *10-2 N force is applied horizontally to the free end of the string, the force of the string on the toy, at the other end, is:

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

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:

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

A 5-kg concrete block is lowered with a downward acceleration of 2.8 m/s² by means of a rope.The force of the block on the Earth is:

A short 10-g string is used to pull a 50-g toy across a frictionless horizontal surface.If a 3.0 *10^-2 N force is applied horizontally to the free end of the string, the force of the string on the toy, at the other end, is: