Question 1

The figure shows two forces, each of magnitude 4.6 N, acting on an object. The angle between these forces is 40°, and they make equal angles above and below the horizontal. What third force will cause the object to be in equilibrium (acceleration equals zero) ?

Accepted Answer

A)   8.6 N pointing to the right
B)   7.0 N pointing to the right
C)   4.3 N pointing to the right
D)   3.5 N pointing to the right

Question 2

The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it. What is the acceleration at points A and B?

Accepted Answer

A: 16 M/S²,...

Question 3

The graph in the figure shows the x component of the acceleration of a 2.4-kg object as a function of time (in ms).  (a) At what time(s) does the x component of the net force on the object reach its maximum magnitude, and what is that maximum magnitude?
(b) What is the x component of the net force on the object at time t = 0.0 ms and at t = 4.0 ms?

Accepted Answer

(a) At 3.0...

Question 4

A ball is tossed vertically upward. When it reaches its highest point (before falling back downward)

Accepted Answer

A)   the velocity is zero, the acceleration is directed downward, and the force of gravity acting on the ball is directed downward.
B)   the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is zero.
C)   the velocity is zero, the acceleration is zero, and the force of gravity acting on the ball is directed downward.
D)   the velocity and acceleration reverse direction, but the force of gravity on the ball remains downward.
E)   the velocity, acceleration, and the force of gravity on the ball all reverse direction.

Question 5

You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. The force acting on you that causes you to fall forward is

Accepted Answer

A)   the force of gravity.
B)   the normal force due to your contact with the floor of the bus.
C)   the force due to static friction between you and the floor of the bus.
D)   the force due to kinetic friction between you and the floor of the bus.
E)   No forces were acting on you to cause you to fall.

Question 6

Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 7

The figure shows two forces acting at right angles on an object. They have magnitudes 1 B)  6.6 N at 108° counterclockwise from   1 C)  4.2 N at 162° counterclockwise from   1 D)  4.2 N at 108° counterclockwise from   1" class="answers-bank-image d-inline" rel="preload" > = 6.3 N and 1 B)  6.6 N at 108° counterclockwise from   1 C)  4.2 N at 162° counterclockwise from   1 D)  4.2 N at 108° counterclockwise from   1" class="answers-bank-image d-inline" rel="preload" > = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ? 1 B)  6.6 N at 108° counterclockwise from   1 C)  4.2 N at 162° counterclockwise from   1 D)  4.2 N at 108° counterclockwise from   1" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   6.6 N at 162° counterclockwise from 1 
B)   6.6 N at 108° counterclockwise from   1 
C)   4.2 N at 162° counterclockwise from   1 
D)   4.2 N at 108° counterclockwise from   1" class="answers-bank-image d-inline" rel="preload" > 1
B)   6.6 N at 108° counterclockwise from 1 
B)   6.6 N at 108° counterclockwise from   1 
C)   4.2 N at 162° counterclockwise from   1 
D)   4.2 N at 108° counterclockwise from   1" class="answers-bank-image d-inline" rel="preload" > 1
C)   4.2 N at 162° counterclockwise from 1 
B)   6.6 N at 108° counterclockwise from   1 
C)   4.2 N at 162° counterclockwise from   1 
D)   4.2 N at 108° counterclockwise from   1" class="answers-bank-image d-inline" rel="preload" > 1
D)   4.2 N at 108° counterclockwise from 1 
B)   6.6 N at 108° counterclockwise from   1 
C)   4.2 N at 162° counterclockwise from   1 
D)   4.2 N at 108° counterclockwise from   1" class="answers-bank-image d-inline" rel="preload" > 1

Question 8

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point down the ramp.

Accepted Answer

A)   True
B)   False

Question 9

A 615 N student standing on a scale in an elevator notices that the scale reads 645 N. From this information, the student knows that the elevator must be moving

Accepted Answer

A)   downward.
B)   upward.
C)   You cannot tell if it is moving upward or downward.

Question 10

Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? f is the force of the floor on the person and   g is the force of gravity on the person. A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" > f is the force of the floor on the person and f is the force of the floor on the person and   g is the force of gravity on the person. A)    B)    C)    D)    E)   " class="answers-bank-image d-inline" rel="preload" > g is the force of gravity on the person.

Accepted Answer

A)   f is the force of the floor on the person and   g is the force of gravity on the person. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
B)   f is the force of the floor on the person and   g is the force of gravity on the person. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
C)   f is the force of the floor on the person and   g is the force of gravity on the person. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
D)   f is the force of the floor on the person and   g is the force of gravity on the person. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >
E)   f is the force of the floor on the person and   g is the force of gravity on the person. 
A)     
B)     
C)     
D)     
E)    " class="answers-bank-image d-inline" rel="preload" >

Exam 5: Force and Motion

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point down the ramp.

Correct Answer
verified

Correct Answer
verified
(a) At 3.0...
View Answer

The figure shows two forces acting at right angles on an object. They have magnitudes = 6.3 N and = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ?

Correct Answer
verified

Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero?

Correct Answer
verified

A ball is tossed vertically upward. When it reaches its highest point (before falling back downward)

Correct Answer
verified

You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. The force acting on you that causes you to fall forward is

Correct Answer
verified

The figure shows two forces, each of magnitude 4.6 N, acting on an object. The angle between these forces is 40°, and they make equal angles above and below the horizontal. What third force will cause the object to be in equilibrium (acceleration equals zero) ?

Correct Answer
verified

Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? _f is the force of the floor on the person and _g is the force of gravity on the person.

Correct Answer
verified

The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it. What is the acceleration at points A and B?

Correct Answer
verified
A: 16 M/S²,...
View Answer

A 615 N student standing on a scale in an elevator notices that the scale reads 645 N. From this information, the student knows that the elevator must be moving

Correct Answer
verified

Exam 5: Force and Motion

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s. The vector sum of all the forces acting on this crate must point down the ramp.

Correct AnswerverifiedShow Answer

Correct Answerverified(a) At 3.0...View AnswerShow Answer

The figure shows two forces acting at right angles on an object. They have magnitudes = 6.3 N and = 2.1 N. What third force will cause the object to be in equilibrium (acceleration equals zero) ?

Correct AnswerverifiedShow Answer

Point P in the figure indicates the position of an object traveling at constant speed clockwise around the circle. Which arrow best represent the direction the object would travel if the net external force on it were suddenly reduced to zero?

Correct AnswerverifiedShow Answer

A ball is tossed vertically upward. When it reaches its highest point (before falling back downward)

Correct AnswerverifiedShow Answer

You are standing in a moving bus, facing forward, and you suddenly fall forward as the bus comes to an immediate stop. The force acting on you that causes you to fall forward is

Correct AnswerverifiedShow Answer

The figure shows two forces, each of magnitude 4.6 N, acting on an object. The angle between these forces is 40°, and they make equal angles above and below the horizontal. What third force will cause the object to be in equilibrium (acceleration equals zero) ?

Correct AnswerverifiedShow Answer

Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? f is the force of the floor on the person and g is the force of gravity on the person.

Correct AnswerverifiedShow Answer

The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it. What is the acceleration at points A and B?

Correct AnswerverifiedA: 16 M/S2,...View AnswerShow Answer

A 615 N student standing on a scale in an elevator notices that the scale reads 645 N. From this information, the student knows that the elevator must be moving

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
(a) At 3.0...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which one of the following free-body diagrams best represents the free-body diagram, with correct relative force magnitudes, of a person in an elevator that is traveling upward with an unchanging velocity? _f is the force of the floor on the person and _g is the force of gravity on the person.

Correct Answer
verified

Correct Answer
verified
A: 16 M/S²,...
View Answer

Correct Answer
verified