Question 1

A block slides down a frictionless inclined plane. All of the following are correct except

Accepted Answer

A)  the velocity of the block changes with time. 
B)  the acceleration of the block is less than the acceleration of gravity. 
C)  the normal force on the block is less than the weight of the block. 
D)  the frictional force on the block is less than the weight of the block. 
A)  the velocity of the block changes with time. 
B)  the acceleration of the block is less than the acceleration of gravity. 
C)  the normal force on the block is less than the weight of the block. 
D)  the frictional force on the block is less than the weight of the block. A

Question 2

A block is at rest on a frictionless horizontal plane. As one end of the plane is slowly raised, the block eventually "breaks loose" when the plane makes an angle, $\theta$ , with the horizontal. At this moment the coefficient of static friction is

Accepted Answer

A)  sin $\theta$ 
B)  cos $\theta$ 
C)  tan $\theta$ 
D)  cot $\theta$ 
A)  sin $\theta$ 
B)  cos $\theta$ 
C)  tan $\theta$ 
D)  cot $\theta$ C

Question 3

If the velocity of an object undergoing uniform circular motion is doubled, the centripetal force will

Accepted Answer

A)  remain the same. 
B)  increase by a factor of 2. 
C)  increase by a factor of 4. 
D)  decrease by a factor of 2. 
A)  remain the same. 
B)  increase by a factor of 2. 
C)  increase by a factor of 4. 
D)  decrease by a factor of 2. C

Question 4

A package is placed on the back of a flatbed truck. The coefficient of static friction between the package and the bed of the truck is fs 2, the maximum velocity tat which he truck can travel around a 25-m-radius curve without losing the load is

Accepted Answer

A)  36 km/h. 
B)  10 km/h. 
C)  1.0 * 102 km/h. 
D)  unknown; the answer cannot be determined without knowing the mass of the object. 
A)  36 km/h. 
B)  10 km/h. 
C)  1.0 * 102 km/h. 
D)  unknown; the answer cannot be determined without knowing the mass of the object.

Question 5

A small block slides down the surface of a large stationary sphere. All of the following depend on the location of the block on the sphere except for

Accepted Answer

A)  the block's speed. 
B)  the block's velocity. 
C)  the acceleration of gravity. 
D)  Hold it! There are no exceptions. 
A)  the block's speed. 
B)  the block's velocity. 
C)  the acceleration of gravity. 
D)  Hold it! There are no exceptions.

Question 6

A smooth block rests on the surface of a horizontal plane. As one end of the plane is slowly raised, the block starts sliding down. The speed of the block

Accepted Answer

A)  decreases with time. 
B)  remains unchanged. 
C)  increases with time. 
D)  is unknown; insufficient information is given to answer this question. 
A)  decreases with time. 
B)  remains unchanged. 
C)  increases with time. 
D)  is unknown; insufficient information is given to answer this question.

Question 7

A 5.0-kg box slides up an inclined plane at a constant speed when a 25-N force is applied to it parallel to the plane of incline. Assuming that the acceleration of gravity is 10 m/s2, the coefficient of kinetic friction between the box and the incline is

Accepted Answer

A)  fk = 0.20. 
B)  fk = 0.25. 
C)  fk = 0.30. 
D)  fk = 0.35. 
A)  fk = 0.20. 
B)  fk = 0.25. 
C)  fk = 0.30. 
D)  fk = 0.35.

Question 8

Consider two masses: M1 = 1.4 kg and M2 = 2.5 kg connected by a strong cord of negligible mass that extends over a frictionless pulley. The masses are placed on surfaces that make angles of 27° and 60° respectively with respect to the horizontal. The coefficient of kinetic friction between the surfaces and the masses is 0.30. Assuming that the acceleration of gravity is 10 m/s2, the acceleration of M1 
Is

Accepted Answer

A)  0 m/s2. 
B)  1.0 m/s2. 
C)  2.0 m/s2. 
D)  3.0 m/s2. 
A)  0 m/s2. 
B)  1.0 m/s2. 
C)  2.0 m/s2. 
D)  3.0 m/s2.

Question 9

A 1.0-kg mass rests on an inclined plane (angle of incline = 60°). Assuming that the acceleration of gravity is 10 m/s2, the normal force acting on the mass is

Accepted Answer

A)  8.5 N. 
B)  5.0 N. 
C)  10 N. 
D)  0.0 N. 
A)  8.5 N. 
B)  5.0 N. 
C)  10 N. 
D)  0.0 N.

Question 10

A block is at rest on a frictionless incline that makes an angle, $\theta$ , with the horizontal. The normal force on the block is proportional to

Accepted Answer

A)  sin $\theta$ . 
B)  cos $\theta$ 
C)  tan $\theta$ 
D)  Hold it! This force is independent of $\theta$ 
A)  sin $\theta$ . 
B)  cos $\theta$ 
C)  tan $\theta$ 
D)  Hold it! This force is independent of $\theta$

Question 11

A smooth block rests on the surface of a horizontal plane. As one end of the plane is slowly raised, the magnitude of the normal force on the block

Accepted Answer

A)  decreases. 
B)  remains unchanged. 
C)  increases. 
D)  is unknown; insufficient information is given to answer this question. 
A)  decreases. 
B)  remains unchanged. 
C)  increases. 
D)  is unknown; insufficient information is given to answer this question.

Question 12

A 1.0-kg mass hangs at the end of a strong, massless cord attached to a 2.0-kg mass. The 2.0-kg mass hangs at the end of another strong, massless cord. A force applied to the "upper" cord accelerates the system upward at 10 m/s2. Assuming that the acceleration of gravity is 10 m/s2, the tension in the upper cord is

Accepted Answer

A)  20 N. 
B)  30 N. 
C)  40 N. 
D)  60 N. 
A)  20 N. 
B)  30 N. 
C)  40 N. 
D)  60 N.

Question 13

Consider a crate of mass 5.0 kg resting on the floor. A man pushing along a line making an angle of 15° with the plane of the floor is overcoming the frictional force (coefficient µk = 0.45) and sliding the crate with an acceleration of 1.0 m/s2. The minimum force necessary to produce this motion is

Accepted Answer

A)  15 N. 
B)  23 N. 
C)  32 N. 
D)  Hold it! Insufficient information is given for an unambiguous response. 
A)  15 N. 
B)  23 N. 
C)  32 N. 
D)  Hold it! Insufficient information is given for an unambiguous response.

Question 14

A 50.0-N horizontal force is applied to a 40.0-N crate that is placed on a 15° ramp. The coefficient of kinetic friction between the crate and the ramp is 0.25. The net force acting on the crate is

Accepted Answer

A)  25 N. 
B)  30 N. 
C)  40 N. 
D)  50 N. 
A)  25 N. 
B)  30 N. 
C)  40 N. 
D)  50 N.

Question 15

A spring with a force constant of 5.0 N/m is used to suspend a 2.0-N weight. The displacement of the mass is

Accepted Answer

A)  0.40 m. 
B)  10 m. 
C)  2.5 m. 
D)  -2.5 m. 
A)  0.40 m. 
B)  10 m. 
C)  2.5 m. 
D)  -2.5 m.

Question 16

Two springs with force constants of 30 N/m and 20 N/m are connected in parallel. When an object is hung from the springs, they extend 0.30 m. Assuming that the acceleration of gravity is 10 m/s2, the mass of the object is

Accepted Answer

A)  0.50 kg. 
B)  1.0 kg. 
C)  1.5 kg. 
D)  2.0 kg. 
A)  0.50 kg. 
B)  1.0 kg. 
C)  1.5 kg. 
D)  2.0 kg.

Question 17

A mass of 2.0 kg in contact with a horizontal plane (coefficient of friction 0.25) is moving horizontally due to an external horizontal force of 6.0 N. Assuming that the acceleration of gravity is 10 m/s2, the magnitude of the mass's acceleration is

Accepted Answer

A)  0.50 m/s2. 
B)  1.0 m/s2. 
C)  2.0 m/s2. 
D)  3.0 m/s2. 
A)  0.50 m/s2. 
B)  1.0 m/s2. 
C)  2.0 m/s2. 
D)  3.0 m/s2.

Question 18

A block slides down a frictionless inclined plane. The block is held in place on the plane until the platform on which the plane rests is given an acceleration to the right. The block is then released. During the time the platform is accelerated

Accepted Answer

A)  the velocity of the block changes with time. 
B)  the block may accelerate up the incline. 
C)  the normal force on the block changes with time. 
D)  the normal force on the block is less than the weight of the block. 
A)  the velocity of the block changes with time. 
B)  the block may accelerate up the incline. 
C)  the normal force on the block changes with time. 
D)  the normal force on the block is less than the weight of the block.

Question 19

A roller coaster traveling at 15 m/s goes through a dip in the track whose radius of curvature is 45 m. Assuming that the acceleration of gravity is 10 m/s2, the number of "g's" the riders experience is

Accepted Answer

A)  1.5 g. 
B)  0.50 g. 
C)  5.0 g. 
D)  6.0 g. 
A)  1.5 g. 
B)  0.50 g. 
C)  5.0 g. 
D)  6.0 g.

Question 20

A small block slides down the surface of a large stationary sphere. The magnitude of all of the following depend on the location of the body on the sphere except for the

Accepted Answer

A)  kinetic friction. 
B)  centripetal force. 
C)  normal force. 
D)  weight. 
A)  kinetic friction. 
B)  centripetal force. 
C)  normal force. 
D)  weight.

Exam 6: Further Applications of Newtons Laws

A block slides down a frictionless inclined plane. All of the following are correct except

A block is at rest on a frictionless horizontal plane. As one end of the plane is slowly raised, the block eventually "breaks loose" when the plane makes an angle, θ\thetaθ , with the horizontal. At this moment the coefficient of static friction is

If the velocity of an object undergoing uniform circular motion is doubled, the centripetal force will

A small block slides down the surface of a large stationary sphere. All of the following depend on the location of the block on the sphere except for

A smooth block rests on the surface of a horizontal plane. As one end of the plane is slowly raised, the block starts sliding down. The speed of the block

A 5.0-kg box slides up an inclined plane at a constant speed when a 25-N force is applied to it parallel to the plane of incline. Assuming that the acceleration of gravity is 10 m/s2, the coefficient of kinetic friction between the box and the incline is

A 1.0-kg mass rests on an inclined plane (angle of incline = 60°). Assuming that the acceleration of gravity is 10 m/s2, the normal force acting on the mass is

A block is at rest on a frictionless incline that makes an angle, θ\thetaθ , with the horizontal. The normal force on the block is proportional to

A smooth block rests on the surface of a horizontal plane. As one end of the plane is slowly raised, the magnitude of the normal force on the block

A 50.0-N horizontal force is applied to a 40.0-N crate that is placed on a 15° ramp. The coefficient of kinetic friction between the crate and the ramp is 0.25. The net force acting on the crate is

A spring with a force constant of 5.0 N/m is used to suspend a 2.0-N weight. The displacement of the mass is

Two springs with force constants of 30 N/m and 20 N/m are connected in parallel. When an object is hung from the springs, they extend 0.30 m. Assuming that the acceleration of gravity is 10 m/s2, the mass of the object is

A mass of 2.0 kg in contact with a horizontal plane (coefficient of friction 0.25) is moving horizontally due to an external horizontal force of 6.0 N. Assuming that the acceleration of gravity is 10 m/s2, the magnitude of the mass's acceleration is

A block slides down a frictionless inclined plane. The block is held in place on the plane until the platform on which the plane rests is given an acceleration to the right. The block is then released. During the time the platform is accelerated

A roller coaster traveling at 15 m/s goes through a dip in the track whose radius of curvature is 45 m. Assuming that the acceleration of gravity is 10 m/s2, the number of "g's" the riders experience is

A small block slides down the surface of a large stationary sphere. The magnitude of all of the following depend on the location of the body on the sphere except for the

Space, Time, and Mass

Motion Along a Straight Line

Vectors

Motion in Two and Three Dimensions

Newtons Laws of Motion

Work and Energy

Conservation of Energy

Gravitation

Systems of Particles

Collisions

Rotation of a Rigid Body

Dynamics of a Rigid Body

Statics and Elasticity

Oscillations

Waves

Sound

Fluid Mechanics

The Ideal Gas

Heat

Thermodynamics

Electric Force and the Electric Charge

The Electric Field

Gauss Law

Electrostatic Potential and Energy

Capacitors and Dielectrics

Currents and Ohms Law

Direct Current Circuits

Magnetic Force and Field

Charges and Currents in Magnetic Fields

Electromagnetic Induction

Alternating Current Circuits

Electromagnetic Waves

Reflection, Refraction, and Optics

Interference and Diffraction

The Theory of Special Relativity

Quanta of Light

Spectral Lines, Bohrs Theory, and Quantum Mechanics

Quantum Structure of Atoms, Molecules, and Solids

Nuclei

Elementary Particles and Cosmology

Filters

A block is at rest on a frictionless horizontal plane. As one end of the plane is slowly raised, the block eventually "breaks loose" when the plane makes an angle, $\theta$ , with the horizontal. At this moment the coefficient of static friction is

A 5.0-kg box slides up an inclined plane at a constant speed when a 25-N force is applied to it parallel to the plane of incline. Assuming that the acceleration of gravity is 10 m/s², the coefficient of kinetic friction between the box and the incline is

A 1.0-kg mass rests on an inclined plane (angle of incline = 60°). Assuming that the acceleration of gravity is 10 m/s², the normal force acting on the mass is

A block is at rest on a frictionless incline that makes an angle, $\theta$ , with the horizontal. The normal force on the block is proportional to

Two springs with force constants of 30 N/m and 20 N/m are connected in parallel. When an object is hung from the springs, they extend 0.30 m. Assuming that the acceleration of gravity is 10 m/s², the mass of the object is

A mass of 2.0 kg in contact with a horizontal plane (coefficient of friction 0.25) is moving horizontally due to an external horizontal force of 6.0 N. Assuming that the acceleration of gravity is 10 m/s², the magnitude of the mass's acceleration is

A roller coaster traveling at 15 m/s goes through a dip in the track whose radius of curvature is 45 m. Assuming that the acceleration of gravity is 10 m/s², the number of "g's" the riders experience is