Halliday/Resnick/Walker Fundamentals of Physics 8 th edition

Halliday/Resnick/WalkerFundamentals of Physics 8th edition • Classroom Response System Questions Chapter 5 Force and Motion Reading Quiz Questions

5.2.1. Which of the following phrases best describes the main subject of this chapter? a) the unification of the forces of nature b) the relationship between a force and acceleration c) the life of Isaac Newton d) the laws of physics e) the best method for solving physics problems

5.2.2. Which one of the following statements concerning Newtonian mechanics is false? a) Newtonian mechanics was developed by Isaac Newton. b) Newtonian mechanics can be considered a special case of either Special Relativity or Quantum Mechanics, which are more comprehensive theories. c) Newtonian mechanics can be used to describe the motion of galaxies. d) Newtonian mechanics provides an understanding of the relationship between forces and accelerations. e) Newtonian mechanics applies to all objects, regardless of their speed or acceleration.

5.3.1. Which of the following statements is true according to Newton’s first law of motion? a) A net force is required to maintain an object at rest. b) A net force is required to maintain an object’s constant velocity. c) A net force is required to change an object’s velocity.

5.3.2. Which one of the following statements concerning Newton’s first law of motion is false? a) If no force acts on an object, the object's velocity cannot change. b) If no net force acts on an object, the object cannot accelerate. c) All objects in motion have forces acting on them. d) All of the answers above are false.

5.4.1. What unit is defined by a 1-m/s2 acceleration of a 1-kg object? a) Lorenz b) Newton c) Dawson d) Einstein e) Nelson

5.4.2. Complete the following statement: The net force that results when two or more forces act on an object is a) determined by adding the magnitudes of the individual forces. The direction of the net force is the same as the direction of motion. b) the largest force acting on the object. c) determined using vector addition of the individual forces acting on the object. d) the magnitude of the largest force acting on the object. The direction of the net force is the same as the direction of motion.

5.4.3. Complete the following statement: The term net force most accurately describes a) the inertia of an object. b) the quantity that causes displacement. c) the quantity that keeps an object moving. d) the mass of an object. e) the quantity that changes the velocity of an object.

5.4.4. Complete the following statement: An inertial reference frame is one in which a) the frame is accelerating. b) Newton’s laws of motion are valid. c) the acceleration due to gravity is greater than zero m/s2. d) Newton’s third law of motion is not valid. e) the coordinate axes are rotating.

5.5.1. With one exception, each of the following units can be used to express mass. What is the exception? a) newton b) kilogram c) gram d) N•s2/m

5.6.1. A net force is required to give an object with mass m an acceleration . If a net force 6 is applied to an object with mass 2m, what is the acceleration on this object? a) b) 2 c) 3 d) 4 e) 6

5.6.2. Two forces act on a hockey puck. For which orientation of the forces will the puck acquire an acceleration with the largest magnitude?

5.6.3. Which one of the following tools is useful in representing the forces acting on an object and simplifies problem solving? a) free-body diagram b) scalar drawing c) vector analyzer d) Newton’s ladder e) force monitor

5.6.4. An object moves in the eastward direction at constant speed. A net force directed northward acts on the object for 5.0 s. At the end of the 5.0-second period, the net force drops to zero newtons. Which one of the following statements is necessarily true? a) The final velocity of the object will be directed north of east. b) The object will be moving eastward when the force drops to zero newtons. c) The direction of the object's acceleration depends on how fast the object was initially moving. d) The change in the velocity of the object will be directed north of west. e) The magnitude of the object's acceleration depends on how fast the object was initially moving.

5.6.5. Which one of the following equations is associated with Newton's second law? a) b) c) d) e)

5.6.6. While working on a project in very-low gravity on the orbiting space station, an engineer finds that when a force is applied to a 2.0-kg book, it accelerates at 0.50 m/s2. If the same force is then applied to a 6.0-kg instruction manual, what would the manual’s acceleration be? a) 0.17 m/s2 b) 0.25 m/s2 c) 0.33 m/s2 d) 0.50 m/s2 e) 1.50 m/s2

5.6.7. Under what condition(s) will an object be in equilibrium? a) only if it is at rest b) only if it is moving with constant velocity c) only if it is moving with constant acceleration d) if it is either at rest or moving with constant velocity e) if it is either moving with constant velocity or with constant acceleration

5.7.1. Complete the following statement: Near the surface of the earth, the weight of an object a) is the same as the mass of the object. b) is the gravitational force of the earth on the object. c) has the same value regardless of the altitude above the surface of the earth. d) has the same value regardless of the mass of the object.

5.7.2. During gym class, a boy climbs a vertical rope and temporarily stops half way between the floor below and the ceiling above. Consider the following forces: (1) gravity, (2) normal force, (3) friction, and (4) tension. At that moment, ignoring any effects due to the surrounding air, which of these forces are acting on the boy? a) 1, 2, 3, and 4 b) 1, 2, and 3 only c) 1 and 2 only d) 1 and 3 only e) 1 and 4 only

5.7.3. What is the meaning of the word “normal” in the term “normal force?” a) that it is in magnitude and opposite in direction to the weight of the object b) that it is one that is encountered in everyday life c) that it is directed perpendicular to a surface d) that it is measurable e) that it has a magnitude of 1 unit

5.7.4. A brick is resting on the surface of a flat board. As one end of the board is slowly raised, what change, if any, is there in the normal force exerted on the brick? a) The normal force increases. b) The normal force decreases. c) The normal force remains constant. d) Only the direction of the normal force changes.

5.7.5. A smooth wooden block is sitting at rest on a flat wood board that makes an angle  with respect to the horizontal plane. To which of the following parameters is the normal force on the block proportional? a) cos  b) sin  c) tan 

5.8.1. Which one of the following statements is true according to Newton’s third law of motion? a) The vector sum of all forces acting on an object is zero. b) A force on an object produces an equal in magnitude, but oppositely directed force on another object. c) A force on an object produces another equal in magnitude, but oppositely directed force on the object. d) A force on an object produces another differing in magnitude, but oppositely directed force on the object. e) A force on an object produces another differing in magnitude, but oppositely directed force on another object.

5.8.2. A cell phone is sitting on a desk. Which one of the following is the reaction force to the cell phone’s weight on the desk? a) the gravitational force on the cell phone b) the gravitational force on the table c) the normal force of the Earth on the table d) the normal force of the cell phone on the table e) the normal force of the table on the cell phone

5.8.3. Ryan walked to a cliff and dropped a stone. Neglecting any effects due to the air as it falls vertically, which one of the following is the reaction force to the Earth’s gravity on the stone? a) the normal force of the ground below b) the normal force of Ryan’s hand on the stone c) the gravitational force of the stone on the Earth d) No reaction force appears in this situation since the stone is not exerting any forces on anything else.

5.9.1. Note the following situations: In which case will the magnitude of the normal force on the block be equal to (Mg + F sin )? a) case 1 only b) case 2 only c) both cases 1 and 2 d) both cases 2 and 3 e) cases 1, 2, and 3

Halliday/Resnick/Walker Fundamentals of Physics 8 th edition