# Quiz: Newton's Laws Of Motion And Fbds

20 Questions  I  By Songj2
Sample quiz for Newton's laws of motion and free-body diagrams.

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 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. Acceleration only occurs if there is net force
 B. The acceleration of an object depends on its mass and the net force acting on it
 C. Objects which are moving tend to stay moving
 D. Forces always occur in pairs
 E. Objects won't move unless pushed
 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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