Question 1

In the figure, if the tension in string 1 is 34 N and the tension in string 2 is 24 N, what is the mass of the object shown? ​   ​

Accepted Answer

A) 7.3 kg 
B) 5.5 kg 
C) 1.8 kg 
D) 3.7 kg 
E) 4.5 kg 
A) 7.3 kg 
B) 5.5 kg 
C) 1.8 kg 
D) 3.7 kg 
E) 4.5 kg

Question 2

The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M = 5.0 kg, F = 14 N and θ = 35°, what is the coefficient of kinetic friction between the block and the horizontal surface?

Accepted Answer

A) 0.44 
B) 0.33 
C) 0.38 
D) 0.28 
E) 0.17 
A) 0.44 
B) 0.33 
C) 0.38 
D) 0.28 
E) 0.17

Question 3

If the only forces acting on a 2.0-kg mass are   , and   , what is the magnitude of the acceleration of the particle?

Accepted Answer

A) 1.5 m/s2 
B) 6.5 m/s2 
C) 4.7 m/s2 
D) 9.4 m/s2 
E) 7.2 m/s2 
A) 1.5 m/s2 
B) 6.5 m/s2 
C) 4.7 m/s2 
D) 9.4 m/s2 
E) 7.2 m/s2

Question 4

Two blocks connected by a string are pulled across a horizontal surface by a force applied to one of the blocks, as shown. The coefficient of kinetic friction between the blocks and the surface is 0.25. If each block has an acceleration of 2.0 m/s2 to the right, what is the magnitude F of the applied force? ​   ​

Accepted Answer

A) 25 N 
B) 18 N 
C) 11 N 
D) 14 N 
E) 7.0 N 
A) 25 N 
B) 18 N 
C) 11 N 
D) 14 N 
E) 7.0 N

Question 5

A 2.0-kg object has a velocity of   m/s at t = 0. A constant resultant force of   then acts on the object for 3.0 s. What is the magnitude of the object's velocity at the end of the 3.0-s interval?

Accepted Answer

A) 9.2 m/s 
B) 6.3 m/s 
C) 8.2 m/s 
D) 7.2 m/s 
E) 7.7 m/s 
A) 9.2 m/s 
B) 6.3 m/s 
C) 8.2 m/s 
D) 7.2 m/s 
E) 7.7 m/s

Question 6

A heavy weight is supported by two cables that exert tensions of magnitude   and   . Which statement is correct? ​   ​

Accepted Answer

A) = . B) = . C) > . D) < . E) We need the mass of the box in order to determine the correct answer. A) = . B) = . C) > . D) < . E) We need the mass of the box in order to determine the correct answer.

Question 7

Two blocks are accelerated across a horizontal frictionless surface as shown. Frictional forces keep the two blocks from sliding relative to each other, and the two move with the same acceleration. If F = 1.2 N and M = 1.0 kg, what is the horizontal component (frictional force) of the force of the small block on the large block?

Accepted Answer

A) 0.48 N to the right 
B) 0.72 N to the right 
C) 0.72 N to the left 
D) 0.48 N to the left 
E) 0.65 N to the left 
A) 0.48 N to the right 
B) 0.72 N to the right 
C) 0.72 N to the left 
D) 0.48 N to the left 
E) 0.65 N to the left

Question 8

The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2. What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg.

Accepted Answer

A) 6.0 N 
B) 5.1 N 
C) 5.5 N 
D) 4.6 N 
E) 3.7 N 
A) 6.0 N 
B) 5.1 N 
C) 5.5 N 
D) 4.6 N 
E) 3.7 N

Question 9

Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the force   the floor exerts on the first person to the force   the rope exerts on the second person. Which statement is correct?

Accepted Answer

A) They are equal and opposite in direction. 
B) They are equal and have the same direction. 
C)    is greater than   , but they have the same direction. 
D)    is greater than   , but they have opposite directions. 
E)    is less than   , but they have the same direction. 
A) They are equal and opposite in direction. 
B) They are equal and have the same direction. 
C)    is greater than   , but they have the same direction. 
D)    is greater than   , but they have opposite directions. 
E)    is less than   , but they have the same direction.

Question 10

You hold a tennis racket in your hand. On top of the racket you have balanced a ball. Which statement is true?

Accepted Answer

A) The force of your hand on the racket and the force of the ball on the racket are equal and opposite. 
B) The force of the racket on your hand and the force of the ball on the racket are equal and opposite. 
C) The force of your hand on the racket and the force of the racket on the ball are equal and opposite. 
D) The force of the racket on your hand and the force of the racket on the ball are equal and opposite. 
E) The force of your hand on the racket and the force of the racket on your hand are equal and opposite. 
A) The force of your hand on the racket and the force of the ball on the racket are equal and opposite. 
B) The force of the racket on your hand and the force of the ball on the racket are equal and opposite. 
C) The force of your hand on the racket and the force of the racket on the ball are equal and opposite. 
D) The force of the racket on your hand and the force of the racket on the ball are equal and opposite. 
E) The force of your hand on the racket and the force of the racket on your hand are equal and opposite.

Question 11

A bumper car is moving at constant velocity when another bumper car starts to push on it with a constant force at an angle of 60 degrees with respect to the first car's initial velocity. The second bumper car continues pushing in exactly that direction for some time. What is most likely to happen is that

Accepted Answer

A) the first car will stop moving. 
B) the first car will move in the direction of the force. 
C) the first car's velocity will increase in magnitude but not change direction. 
D) the first car's velocity will gradually change direction more and more toward that of the force while increasing in magnitude. 
E) the first car's velocity will gradually change direction more and more toward that of the force while decreasing in magnitude. 
A) the first car will stop moving. 
B) the first car will move in the direction of the force. 
C) the first car's velocity will increase in magnitude but not change direction. 
D) the first car's velocity will gradually change direction more and more toward that of the force while increasing in magnitude. 
E) the first car's velocity will gradually change direction more and more toward that of the force while decreasing in magnitude.

Question 12

The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22 N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block? ​   ​

Accepted Answer

A) 1.8 m/s2 
B) 2.6 m/s2 
C) 1.4 m/s2 
D) 2.2 m/s2 
E) 3.7 m/s2 
A) 1.8 m/s2 
B) 2.6 m/s2 
C) 1.4 m/s2 
D) 2.2 m/s2 
E) 3.7 m/s2

Question 13

A 2.30-kg mass is suspended from the ceiling and a 1.70-kg mass is suspended from the 2.30-kg mass, as shown. The tensions in the strings are labeled   and   .
​   ​
Use this exhibit to answer the following question(s).
- A hand exerts an upward force of 6.70 N on the 1.70-kg mass. The magnitudes of the tensions are

Accepted Answer

A)    = 15.8 N;   = 10.0 N. 
B)    = 15.8 N;   = 16.7 N. 
C)    = 22.5 N;   = 10.0 N. 
D)    = 22.5 N;   = 16.7 N. 
E)    = 32.5 N;   = 10.0 N. 
A)    = 15.8 N;   = 10.0 N. 
B)    = 15.8 N;   = 16.7 N. 
C)    = 22.5 N;   = 10.0 N. 
D)    = 22.5 N;   = 16.7 N. 
E)    = 32.5 N;   = 10.0 N.

Question 14

An astronaut who weighs 800 N on the surface of the Earth lifts off from planet Zuton in a space ship. The free-fall acceleration on Zuton is 3.0 m/s2 (down). At the moment of liftoff the acceleration of the space ship is 0.50 m/s2 (up). What is the magnitude of the force of the space ship on the astronaut?

Accepted Answer

A) 41 N 
B) 0.29 kN 
C) 0.24 kN 
D) 0.20 kN 
E) 0.37 kN 
A) 41 N 
B) 0.29 kN 
C) 0.24 kN 
D) 0.20 kN 
E) 0.37 kN

Question 15

If P = 6.0 N, what is the magnitude of the force exerted on block 1 by block 2?

Accepted Answer

A) 6.4 N 
B) 5.6 N 
C) 4.8 N 
D) 7.2 N 
E) 8.4 N 
A) 6.4 N 
B) 5.6 N 
C) 4.8 N 
D) 7.2 N 
E) 8.4 N

Question 16

If F = 4.0 N and m = 2.0 kg, what is the magnitude a of the acceleration for the block shown below? The surface is frictionless.

Accepted Answer

A) 5.3 m/s2 
B) 4.4 m/s2 
C) 3.5 m/s2 
D) 6.2 m/s2 
E) 8.4 m/s2 
A) 5.3 m/s2 
B) 4.4 m/s2 
C) 3.5 m/s2 
D) 6.2 m/s2 
E) 8.4 m/s2

Question 17

The horizontal surface on which the objects slide is frictionless. If M = 2.0 kg, the tension in string 1 is 12 N. Determine F.

Accepted Answer

A) 25 N 
B) 20 N 
C) 30 N 
D) 35 N 
E) 40 N 
A) 25 N 
B) 20 N 
C) 30 N 
D) 35 N 
E) 40 N

Question 18

A 4.0-kg block is pushed up a 36° incline by a force of magnitude P applied parallel to the incline. When P is 31 N, it is observed that the block moves up the incline with a constant speed. What value of P would be required to lower the block down the incline at a constant speed?

Accepted Answer

A) 27 N 
B) 15 N 
C) 13 N 
D) 17 N 
E) 19 N 
A) 27 N 
B) 15 N 
C) 13 N 
D) 17 N 
E) 19 N

Question 19

When the vector sum of three co-planar forces,   ,   , and   , is parallel to   , we can conclude that   and

Accepted Answer

A) must sum to zero. 
B) must be equal and opposite. 
C) must have equal and opposite components perpendicular to   . 
D) must have equal and opposite components parallel to   . 
E) must have equal and opposite components parallel and perpendicular to   . 
A) must sum to zero. 
B) must be equal and opposite. 
C) must have equal and opposite components perpendicular to   . 
D) must have equal and opposite components parallel to   . 
E) must have equal and opposite components parallel and perpendicular to   .

Question 20

Which type of force would be the equal and opposite force to a gravitational force?

Accepted Answer

A) gravitational 
B) electromagnetic 
C) strong 
D) weak 
E) It could be any one of the above or some combination of them. 
A) gravitational 
B) electromagnetic 
C) strong 
D) weak 
E) It could be any one of the above or some combination of them.

Exam 5: Newtons Laws of Motion

In the figure, if the tension in string 1 is 34 N and the tension in string 2 is 24 N, what is the mass of the object shown? ​ ​

The block shown is pulled across the horizontal surface at a constant speed by the force shown. If M = 5.0 kg, F = 14 N and θ = 35°, what is the coefficient of kinetic friction between the block and the horizontal surface?

If the only forces acting on a 2.0-kg mass are , and , what is the magnitude of the acceleration of the particle?

A 2.0-kg object has a velocity of m/s at t = 0. A constant resultant force of then acts on the object for 3.0 s. What is the magnitude of the object's velocity at the end of the 3.0-s interval?

A heavy weight is supported by two cables that exert tensions of magnitude and . Which statement is correct? ​ ​

The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2. What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg.

Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the force the floor exerts on the first person to the force the rope exerts on the second person. Which statement is correct?

You hold a tennis racket in your hand. On top of the racket you have balanced a ball. Which statement is true?

The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22 N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block? ​ ​

If P = 6.0 N, what is the magnitude of the force exerted on block 1 by block 2?

If F = 4.0 N and m = 2.0 kg, what is the magnitude a of the acceleration for the block shown below? The surface is frictionless.

The horizontal surface on which the objects slide is frictionless. If M = 2.0 kg, the tension in string 1 is 12 N. Determine F.

A 4.0-kg block is pushed up a 36° incline by a force of magnitude P applied parallel to the incline. When P is 31 N, it is observed that the block moves up the incline with a constant speed. What value of P would be required to lower the block down the incline at a constant speed?

When the vector sum of three co-planar forces, , , and , is parallel to , we can conclude that and

Which type of force would be the equal and opposite force to a gravitational force?

Getting Started

One-Dimensional Motion

Vectors

Two- and Three-Dimensional Motion

Applications of Newtons Laws of Motion

Gravity

Conservation of Energy

Energy in Nonisolated Systems

Systems of Particles and Conservation of Momentum

Collisions

Rotation I: Kinematics and Dynamics

Rotation II: a Conservation Approach

Static Equilibrium, Elasticity, and Fracture

Fluids

Oscillations

Traveling Waves

Superposition and Standing Waves

Temperature, Thermal Expansion, and Gas Laws

Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

Entropy and the Second Law of Thermodynamics

Electric Forces

Electric Fields

Gausss Law

Electric Potential

Capacitors and Batteries

Current and Resistance

Direct Current Dc Circuits

Magnetic Fields and Forces

Gausss Law for Magnetism and Amperes Law

Faradays Law of Induction

Inductors and Ac Circuits

Maxwells Equations and Electromagnetic Waves

Diffraction and Interference

Applications of the Wave Model

Reflection and Images Formed by Reflection

Refraction and Images Formed by Refraction

Relativity

Filters

In the figure, if the tension in string 1 is 34 N and the tension in string 2 is 24 N, what is the mass of the object shown?

A heavy weight is supported by two cables that exert tensions of magnitude and . Which statement is correct?

The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s². What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg.

The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22 N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block?