Question 1

The net force acting on an object is zero. You can therefore definitely conclude that the object is

Accepted Answer

A)  at rest. 
B)  moving in a straight line at constant speed. 
C)  moving in a circle at constant speed. 
D)  undergoing acceleration. 
E)  either at rest or moving in a straight line at constant speed. 
A)  at rest. 
B)  moving in a straight line at constant speed. 
C)  moving in a circle at constant speed. 
D)  undergoing acceleration. 
E)  either at rest or moving in a straight line at constant speed.

Question 2

A 50-kg box is placed in the bed of a truck. The coefficient of friction between the box and the truck bed is 0.54. If the truck is traveling at 87 km/h ~54 mph) then calculate the minimum distance the truck can stop in without the box sliding into the cab.

Accepted Answer

A)  99 m 
B)  1.4 *103 m 
C)  55 m 
D)  1.2 * 102 m 
E)  2.8 * 102 m 
A)  99 m 
B)  1.4 *103 m 
C)  55 m 
D)  1.2 * 102 m 
E)  2.8 * 102 m

Question 3

A horizontal force   acts on a mass m that lies on a horizontal surface. The acceleration of m is   . The coefficient of kinetic friction µk between mass m and the surface can be calculated from

Accepted Answer

A)  µk = a/g. 
B)  µk = F/mg) - a/g). 
C)  µk = F/mg) + a/g). 
D)  µk = 0. 
E)  None of these is correct. 
A)  µk = a/g. 
B)  µk = F/mg) - a/g). 
C)  µk = F/mg) + a/g). 
D)  µk = 0. 
E)  None of these is correct.

Question 4

A car going around a curve of radius R at a speed V experiences a centripetal acceleration ac. What is its acceleration if it goes around a curve of radius 2R at a speed of 3V?

Accepted Answer

A)  2/3)ac  
B)  4/3)ac  
C)  2/9)ac  
D)  9/2)ac  
E)  3/2)ac  
A)  2/3)ac  
B)  4/3)ac  
C)  2/9)ac  
D)  9/2)ac  
E)  3/2)ac

Question 5

An object with a mass of m = 12.0 g is falling through a resistive fluid in which g is constant. The drag force due to the fluid is F = bv, where F is the force in newtons, b is a constant, and v is the speed in meters per second. If F = 3.2 * 10-2 N when v = 16.0 m/s, the terminal speed of the object falling through the fluid is

Accepted Answer

A)  0.12 m/s. 
B)  59 m/s. 
C)  0.19 km/s. 
D)  16.0 m/s. 
E)  None of these is correct. 
A)  0.12 m/s. 
B)  59 m/s. 
C)  0.19 km/s. 
D)  16.0 m/s. 
E)  None of these is correct.

Question 6

A 100-kg block is pushed up a 30 o  incline that is 10 m long. If the coefficient of friction between the block and the incline is 0.1, the constant force parallel to the incline that is required to move the block from rest at the bottom of the incline to the top in 3 s is approximately

Accepted Answer

A)  0.49 kN. 
B)  0.085 kN. 
C)  0.22 kN. 
D)  0.80 kN. 
E)  0.58 kN. 
A)  0.49 kN. 
B)  0.085 kN. 
C)  0.22 kN. 
D)  0.80 kN. 
E)  0.58 kN.

Question 7

As a skydiver falls through the air, her terminal speed

Accepted Answer

A)  depends on her mass. 
B)  depends on her body's orientation. 
C)  depends on the local value of the acceleration due to gravity. 
D)  depends on the density of the air. 
E)  is described by all of the above. 
A)  depends on her mass. 
B)  depends on her body's orientation. 
C)  depends on the local value of the acceleration due to gravity. 
D)  depends on the density of the air. 
E)  is described by all of the above.

Question 8

The free-body diagram that best represents the forces acting on the student at rest on the incline is

Accepted Answer

A)  1). 
B)  2). 
C)  3). 
D)  4). 
E)  5). 
A)  1). 
B)  2). 
C)  3). 
D)  4). 
E)  5).

Question 9

A 2.0 kg-book is at rest on a 30 o inclined plane. The normal force acting on the book by the inclined plane is

Accepted Answer

A)  2.0 N. 
B)  5.0 N. 
C)  10 N. 
D)  17 N. 
E)  20 N. 
A)  2.0 N. 
B)  5.0 N. 
C)  10 N. 
D)  17 N. 
E)  20 N.

Question 10

A block is placed on a plane whose angle of inclination is 30 o . The coefficients of static and kinetic friction for the block on the inclined plane are both 0.2. The block

Accepted Answer

A)  remains stationary on the inclined plane. 
B)  accelerates down the inclined plane. 
C)  travels down the inclined plane at constant velocity. 
D)  travels up the inclined plane at constant velocity. 
E)  accelerates up the inclined plane. 
A)  remains stationary on the inclined plane. 
B)  accelerates down the inclined plane. 
C)  travels down the inclined plane at constant velocity. 
D)  travels up the inclined plane at constant velocity. 
E)  accelerates up the inclined plane.

Question 11

A block is placed on a plane whose angle of inclination is 30 o . The coefficients of static and kinetic friction for the block on the inclined plane are 0.5 and 0.4, respectively. The block

Accepted Answer

A)  remains stationary on the inclined plane. 
B)  accelerates down the inclined plane. 
C)  travels down the inclined plane at constant velocity. 
D)  travels up the inclined plane at constant velocity. 
E)  accelerates up the inclined plane. 
A)  remains stationary on the inclined plane. 
B)  accelerates down the inclined plane. 
C)  travels down the inclined plane at constant velocity. 
D)  travels up the inclined plane at constant velocity. 
E)  accelerates up the inclined plane.

Question 12

A 2.0 kg-book is at rest on a frictionless horizontal floor. You are applying a 10 N downward force, on the book, at an angle of 30 o from the vertical. The acceleration of the book is

Accepted Answer

A)  5.0 m/s2. 
B)  2.5 m/s2. 
C)  1.0 m/s2. 
D)  9.8 m/s2. 
E)  0 m/s2. 
A)  5.0 m/s2. 
B)  2.5 m/s2. 
C)  1.0 m/s2. 
D)  9.8 m/s2. 
E)  0 m/s2.

Question 13

A proud new Jaguar owner drives her car at a speed of 25 m/s into a corner. The coefficients of friction between the road and the tires are 0.70 static) and 0.40 kinetic). Assuming the car is not skidding while traveling along a path with minimum radius, what is the magnitude of the centripetal acceleration of the car?

Accepted Answer

A)  21 m/s2 
B)  14 m/s2 
C)  9.8 m/s2 
D)  6.9 m/s2 
E)  25 m/s2 
A)  21 m/s2 
B)  14 m/s2 
C)  9.8 m/s2 
D)  6.9 m/s2 
E)  25 m/s2

Question 14

A block of mass m is pulled in the direction shown in the figure across a rough surface with a constant acceleration. The coefficient of kinetic friction is $\mu$k. The acceleration of the object is given by

Accepted Answer

A)    . 
B)    . 
C)    . 
D)    . 
E)    . 
A)    . 
B)    . 
C)    . 
D)    . 
E)    .

Question 15

A 50-kg block rests on a horizontal surface. The coefficient of static friction $\mu$s = 0.50. The coefficient of kinetic friction $\mu$k = 0.35. A force   of 250 N is applied as shown. Which of the following statemen best describes the subsequent motion?

Accepted Answer

A)  The block remains at rest. 
B)  The block moves and continues to move at constant velocity. 
C)  The block accelerates to the right. 
D)  The block does not move until   is increased to greater than 490 N. 
E)  No conclusions can be drawn concerning the movement of the block from the information given. 
A)  The block remains at rest. 
B)  The block moves and continues to move at constant velocity. 
C)  The block accelerates to the right. 
D)  The block does not move until   is increased to greater than 490 N. 
E)  No conclusions can be drawn concerning the movement of the block from the information given.

The net force acting on an object is zero. You can therefore definitely conclude that the object is

A 50-kg box is placed in the bed of a truck. The coefficient of friction between the box and the truck bed is 0.54. If the truck is traveling at 87 km/h ~54 mph) then calculate the minimum distance the truck can stop in without the box sliding into the cab.

A horizontal force acts on a mass m that lies on a horizontal surface. The acceleration of m is . The coefficient of kinetic friction µ_k between mass m and the surface can be calculated from

A car going around a curve of radius R at a speed V experiences a centripetal acceleration a_c. What is its acceleration if it goes around a curve of radius 2R at a speed of 3V?

A 100-kg block is pushed up a 30^o incline that is 10 m long. If the coefficient of friction between the block and the incline is 0.1, the constant force parallel to the incline that is required to move the block from rest at the bottom of the incline to the top in 3 s is approximately

As a skydiver falls through the air, her terminal speed

The free-body diagram that best represents the forces acting on the student at rest on the incline is

A 2.0 kg-book is at rest on a 30^o inclined plane. The normal force acting on the book by the inclined plane is

A block is placed on a plane whose angle of inclination is 30^o. The coefficients of static and kinetic friction for the block on the inclined plane are both 0.2. The block

A block is placed on a plane whose angle of inclination is 30^o. The coefficients of static and kinetic friction for the block on the inclined plane are 0.5 and 0.4, respectively. The block

A 2.0 kg-book is at rest on a frictionless horizontal floor. You are applying a 10 N downward force, on the book, at an angle of 30^o from the vertical. The acceleration of the book is

Introduction to Physics

Linear Motion

Motion in Two and Three Dimensions

Forces and Motion I: Newtons Laws

Work and Energy

Momentum, Collisions, and the Center of Mass

Rotational Motion

Elastic Properties of Matter: Stress and Strain

Gravitation

Fluids

Oscillations

Waves

Thermodynamics I

Thermodynamics II

Electrostatics I: Electric Charge, Forces, and Fields

Electrostatics II: Electric Potential Energy and Electric Potential

Electric Charges in Motion

Magnetism

Electromagnetic Induction

Alternating-Current Circuits

Electromagnetic Waves

Wave Properties of Light

Geometrical Optics

Relativity

Quantum Physics and Atomic Structure

Nuclear Physics

Particle Physics

Filters

Exam 5: Forces and Motion II: Applications

The net force acting on an object is zero. You can therefore definitely conclude that the object is

A 50-kg box is placed in the bed of a truck. The coefficient of friction between the box and the truck bed is 0.54. If the truck is traveling at 87 km/h ~54 mph) then calculate the minimum distance the truck can stop in without the box sliding into the cab.

A horizontal force acts on a mass m that lies on a horizontal surface. The acceleration of m is . The coefficient of kinetic friction µk between mass m and the surface can be calculated from

A car going around a curve of radius R at a speed V experiences a centripetal acceleration ac. What is its acceleration if it goes around a curve of radius 2R at a speed of 3V?

A 100-kg block is pushed up a 30 o incline that is 10 m long. If the coefficient of friction between the block and the incline is 0.1, the constant force parallel to the incline that is required to move the block from rest at the bottom of the incline to the top in 3 s is approximately

As a skydiver falls through the air, her terminal speed

The free-body diagram that best represents the forces acting on the student at rest on the incline is

A 2.0 kg-book is at rest on a 30 o inclined plane. The normal force acting on the book by the inclined plane is

A block is placed on a plane whose angle of inclination is 30 o . The coefficients of static and kinetic friction for the block on the inclined plane are both 0.2. The block

A block is placed on a plane whose angle of inclination is 30 o . The coefficients of static and kinetic friction for the block on the inclined plane are 0.5 and 0.4, respectively. The block

A 2.0 kg-book is at rest on a frictionless horizontal floor. You are applying a 10 N downward force, on the book, at an angle of 30 o from the vertical. The acceleration of the book is

A block of mass m is pulled in the direction shown in the figure across a rough surface with a constant acceleration. The coefficient of kinetic friction is μ\muμ k. The acceleration of the object is given by

A 50-kg block rests on a horizontal surface. The coefficient of static friction μ\muμ s = 0.50. The coefficient of kinetic friction μ\muμ k = 0.35. A force of 250 N is applied as shown. Which of the following statemen best describes the subsequent motion?

Introduction to Physics

Linear Motion

Motion in Two and Three Dimensions

Forces and Motion I: Newtons Laws

Work and Energy

Momentum, Collisions, and the Center of Mass

Rotational Motion

Elastic Properties of Matter: Stress and Strain

Gravitation

Fluids

Oscillations

Waves

Thermodynamics I

Thermodynamics II

Electrostatics I: Electric Charge, Forces, and Fields

Electrostatics II: Electric Potential Energy and Electric Potential

Electric Charges in Motion

Magnetism

Electromagnetic Induction

Alternating-Current Circuits

Electromagnetic Waves

Wave Properties of Light

Geometrical Optics

Relativity

Quantum Physics and Atomic Structure

Nuclear Physics

Particle Physics

Filters

A horizontal force acts on a mass m that lies on a horizontal surface. The acceleration of m is . The coefficient of kinetic friction µ_k between mass m and the surface can be calculated from

A car going around a curve of radius R at a speed V experiences a centripetal acceleration a_c. What is its acceleration if it goes around a curve of radius 2R at a speed of 3V?

A 100-kg block is pushed up a 30^o incline that is 10 m long. If the coefficient of friction between the block and the incline is 0.1, the constant force parallel to the incline that is required to move the block from rest at the bottom of the incline to the top in 3 s is approximately

A 2.0 kg-book is at rest on a 30^o inclined plane. The normal force acting on the book by the inclined plane is

A block is placed on a plane whose angle of inclination is 30^o. The coefficients of static and kinetic friction for the block on the inclined plane are both 0.2. The block

A block is placed on a plane whose angle of inclination is 30^o. The coefficients of static and kinetic friction for the block on the inclined plane are 0.5 and 0.4, respectively. The block

A 2.0 kg-book is at rest on a frictionless horizontal floor. You are applying a 10 N downward force, on the book, at an angle of 30^o from the vertical. The acceleration of the book is