# Quiz: Newton's Laws Of Motion And Fbds

20 Questions | Total Attempts: 3931  Settings  Sample quiz for Newton's laws of motion and free-body diagrams.

• 1.
When analyzing dynamics problems, free-body diagrams
• A.

Should always be used

• B.

Are more useful when analyzing horizontal forces than when analyzing vertical forces

• C.

Should include only the forces that are directly responsible for the acceleration

• D.

Should be used only when objects are accelerating

• E.

Only apply to objects in equilibrium

• 2.
A force of 12 N acting in a direction [30ºE of S] is equivalent to which of the following pairs of forces acting simultaneously?
• A.

24 N [S], 14 N [E]

• B.

14 N [S], 24 N [E]

• C.

12 N [S], 12 N [E]

• D.

6 N [S], 10 N [E]

• E.

10 N [S], 6 N [E]

• 3.
A hockey puck slides along an ice surface shortly after it has left the hockey stick that propelled it. Which of the following free-body diagrams best represents the hockey puck?
• A.

A

• B.

B

• C.

C

• D.

D

• E.

E

• 4.
Study the free-body diagram below and choose the statement that best describes the object's motion.
• A.

The object will accelerate north.

• B.

The object will be motionless.

• C.

The object will accelerate northeast.

• D.

The object will travel with uniform motion.

• E.

The object will travel north with a constant velocity.

• 5.
Study the free-body diagram below and determine what additional force(s) would be required for the object to achieve uniform motion.
• A.

1 N [W]

• B.

1 N [E]

• C.

2 N [N] and 1 N [W]

• D.

2 N [S] and 1 N [E]

• E.

2 N [S] and 1 N [W]

• 6.
The free-body diagram below illustrates the forces acting on a 2.0-kg object as it is being pushed along a horizontal surface. What is the motion of the object?
• A.

Moving at 5.3 m/s2

• B.

Moving at 3.1 m/s

• C.

Moving at 5.3 m/s

• D.

Moving at 3.1 m/s2

• E.

Not moving

• 7.
The free-body diagram of a 4.0-kg object is shown below. What additional force must act so that the object has an acceleration of 2.5 m/s2 [W]?
• A.

14.0 N [W]

• B.

10.0 N [W]

• C.

8.0 N [W]

• D.

6.0 N [W]

• E.

4.0 N [W]

• 8.
Two identical arrows, A and B, are fired with different bows. The bow that fires arrow A exerts twice the average force as the bow that fires arrow B. Compare the accelerations of the two arrows.
• A.

Arrow B will have twice the acceleration of arrow A.

• B.

Arrow A will have twice the acceleration of arrow B.

• C.

Arrow A and arrow B will have the same acceleration.

• D.

Arrow B will have four times the acceleration of arrow A.

• E.

Arrow A will have four times the acceleration of arrow B.

• 9.
A hockey puck of mass 150 g is sliding south along the ice and slows at a rate of 1.2 m/s2. What is the net force acting on the puck?
• A.

1.8 x 102 N [N]

• B.

1.8 x 102 N [S]

• C.

1.8 x 101 N [N]

• D.

1.8 x 10-1 N [N]

• E.

1.9 x 10-1 N [S]

• 10.
Newton's third law essentially states
• A.

Objects won't move unless pushed

• B.

Acceleration only occurs if there is net force

• C.

The acceleration of an object depends on its mass and the net force acting on it

• D.

Objects which are moving tend to stay moving

• E.

Forces always occur in pairs

• 11.
Which of the following observations would be adequately explained by Newton's third law?
• A.

When turning a corner, a passenger in a car is pushed against the door.

• B.

A skater stands on a frictionless pond, tosses her bag in one direction and she accelerates in the opposite direction.

• C.

The normal force on an object is always equal to the force of gravity acting on the same object.

• D.

The friction of a surface causes a sliding object to come to rest.

• E.

When firing a rifle, the force of the rifle on the bullet, is greater than the force of the bullet back on the rifle.

• 12.
If the force of gravity that the earth exerts on you is considered to be the action force then, according to Newton's third law, the corresponding reaction force would be the
• A.

Force of gravity you exert on the Earth

• B.

Normal force of the Earth acting upward on you

• C.

Force your feet exert downward on the Earth

• D.

Force you exert on your feet, pressing them against the Earth

• E.

Force of gravity the Earth exerts on everything else

• 13.
An object is pushed horizontally at a constant velocity. What can correctly be said about the forces acting on the object?
• A.

The force(s) acting forward is/are greater than the force(s) acting backward.

• B.

The sum of all forces is zero.

• C.

The sum of all forces has a value directed forward.

• D.

The forces acting on the object can be said to be “unbalanced.”

• E.

Newton’s second law best summarizes the effect of the forces acting on the object.

• 14.
Which of the following units is equivalent to a newton (N)?
• A.

Kg·m/s2

• B.

G·cm/s

• C.

Kg·s2/m

• D.

Kg·m/s

• E.

Kg·cm/s2

• 15.
A 4.0-kg object, A, and a 2.0-kg object, B, are connected with a rope. A force is applied to another rope attached to the 2.0-kg object that pulls both A and B along a horizontal surface. Which of the following statements is true?
• A.

The force that B exerts on A is greater than the force that A exerts on B.

• B.

The force that A exerts on B is greater than the force that B exerts on A.

• C.

The force that B exerts on A is equal to the force that A exerts on B regardless of the motion of the system.

• D.

The force that B exerts on A is equal to the force that A exerts on B provided that the system slides with uniform motion.

• E.

The sum of the applied force and the force that B exerts on A is equal to the force that A exerts on B.

• 16.
Three masses are suspended vertically as shown in the diagram below. The system is accelerating upward. What is the relationship among the forces of tension?
• A.

|FT1| = |FT2| = |FT3|

• B.

|FT1| > |FT2| > |FT3|

• C.

|FT1| < |FT2| < |FT3|

• D.

|FT1| > |FT2| < |FT3|

• E.

|FT1| > |FT3| < |FT2|

• 17.
The physical quantity, which is the measure of inertia, is
• A.

Density

• B.

Weight

• C.

Force

• D.

Acceleration

• E.

Mass

• 18.
Which law is in control of a spaceship which cruises through space at constant speed without using any fuel?
• A.

Newton's first law

• B.

Newton's second law

• C.

Newton's third law

• D.

Both A and B

• E.

All of the above

• 19.
An object is hanging by two strings, A and B, anchored to the ceiling as in the diagram below.  Each string holds the object in place with a force of 40 N at 30 degrees to the vertical.  Determine the force of gravity required to keep the object motionless.
• A.

35 N [down]

• B.

46 N [down]

• C.

69 N [down]

• D.

80 N [down]

• E.

92 N [down]

• 20.
Describe the motion of the 2.0 kg mass below in the horizontal plane.
• A.

The object accelerates at 1.5 m/s2 [right]

• B.

The object accelerates at 11 m/s2 [right]

• C.

The object accelerates at 12 m/s2 [right]

• D.

The object accelerates at 13 m/s2 [right]

• E.

The object does not accelerate

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