Exam 6: Force and Motion II

A box with a weight of 50 N rests on a horizontal surface. A person pulls horizontally on it with a force of 10 N and it does not move. To start it moving, a second person pulls vertically upward on the box. If the coefficient of static friction is 0.4, what is the smallest vertical force for which the box moves?

(Multiple Choice)

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Question 21

A 1000-kg airplane moves in straight flight at constant speed. The force of air friction is 1800 N. The net force on the plane is:

(Multiple Choice)

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Question 22

The driver of a 1000-kg car tries to turn through a circle of radius 100 m on an unbanked curve at a speed of 10 m/s. The actual frictional force between the tires and a slippery road has a magnitude of 900 N. The car:

(Multiple Choice)

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Question 23

A ball is thrown upward into the air with a speed that is greater than terminal speed. On the way up it slows down and, after its speed equals the terminal speed but before it gets to the top of its trajectory:

(Multiple Choice)

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Question 24

Block A, with a mass of 50 kg, rests on a horizontal table top. The coefficient of static friction is 0.40. A horizontal string is attached to A and passes over a massless, frictionless pulley as shown. The smallest mass m_B of block B, attached to the dangling end, that will start A moving when it is attached to the other end of the string is:

(Multiple Choice)

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Question 25

A 5.0-kg crate is on an incline that makes an angle 30 $\degree$ with the horizontal. If the coefficent of static friction is 0.5, the maximum force that can be applied parallel to the plane without moving the crate is:

(Multiple Choice)

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Question 26

Block A, with a mass of 10 kg, rests on a 35 $\degree$ incline. The coefficient of static friction is 0.40. An attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. The largest mass m_B, attached to the dangling end, for which A remains at rest is: $Block A, with a mass of 10 kg, rests on a 35 \degree incline. The coefficient of static friction is 0.40. An attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. The largest mass m<sub>B</sub>, attached to the dangling end, for which A remains at rest is:$

(Multiple Choice)

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Question 27

A box rests on a rough board 10 meters long. When one end of the board is slowly raised to a height of 6 meters above the other end, the box begins to slide. The coefficient of static friction is:

(Multiple Choice)

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Question 28

An automobile moves on a level horizontal road in a circle of radius 30 m. The coefficient of friction between tires and road is 0.50. The maximum speed with which this car can round this curve is:

(Multiple Choice)

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Question 29

Block A, with a mass of 10 kg, rests on a 35 $\degree$ incline. The coefficient of static friction is 0.40. An attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. The largest mass m_B, of block B, attached to the dangling end, for which A begins to slide down the incline is: $Block A, with a mass of 10 kg, rests on a 35 \degree incline. The coefficient of static friction is 0.40. An attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. The largest mass m<sub>B</sub>, of block B, attached to the dangling end, for which A begins to slide down the incline is:$

(Multiple Choice)

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Question 30

An object of mass m and another object of mass 2m are each forced to move along a circle of radius 1.0 m at a constant speed of 1.0 m/s. The magnitudes of their accelerations are:

(Multiple Choice)

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Question 31

A ball is thrown downward from the edge of a cliff with an initial speed that is three times the terminal speed. Initially its acceleration is

(Multiple Choice)

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Question 32

Block A, with mass m_A, is initially at rest on a horizontal floor. Block B, with mass m_B, is initially at rest on the horizontal top surface of A. The coefficient of static friction between the two blocks is $\mu$ _s. Block A is pulled with a horizonatal force. It begins to slide out from under B if the force is greater than:

(Multiple Choice)

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Question 33

Uniform circular motion is the direct consequence of:

(Multiple Choice)

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Question 34

The magnitude of the force required to cause an 0.04-kg object to move at 0.6 m/s in a circle of radius 1.0 m is:

(Multiple Choice)

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Question 35

A horizontal force of 12 N pushes a 0.5-kg bookk against a vertical wall. The book is initially at rest. If the coefficients of friction are $\mu$ _s = 0.6 and $\mu$ _k = 0.8 which of the following is true?

(Multiple Choice)

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Question 36

A brick slides on a horizontal surface. Which of the following will increase the frictional force on it?

(Multiple Choice)

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Question 37

Block A, with a mass of 10 kg, rests on a 30 $\degree$ incline. The coefficient of kinetic friction is 0.20. The attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. Block B, with a mass of 8.0 kg, is attached to the dangling end of the string. The acceleration of B is: $Block A, with a mass of 10 kg, rests on a 30 \degree incline. The coefficient of kinetic friction is 0.20. The attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. Block B, with a mass of 8.0 kg, is attached to the dangling end of the string. The acceleration of B is:$

(Multiple Choice)

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Question 38

An object moves around a circle. If the radius is doubled keeping the speed the same then the magnitude of the contripetal force must be:

(Multiple Choice)

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Question 39

A block is placed on a rough wooden plane. It is found that when the plane is tilted 30 $\degree$ to the horizontal, the block will slide down at constant speed. The coefficient of kinetic friction of the block with the plane is:

(Multiple Choice)

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Question 40

Showing 21 - 40 of 71

Exam 6: Force and Motion II

A 1000-kg airplane moves in straight flight at constant speed. The force of air friction is 1800 N. The net force on the plane is:

The driver of a 1000-kg car tries to turn through a circle of radius 100 m on an unbanked curve at a speed of 10 m/s. The actual frictional force between the tires and a slippery road has a magnitude of 900 N. The car:

A ball is thrown upward into the air with a speed that is greater than terminal speed. On the way up it slows down and, after its speed equals the terminal speed but before it gets to the top of its trajectory:

A 5.0-kg crate is on an incline that makes an angle 30 °\degree° with the horizontal. If the coefficent of static friction is 0.5, the maximum force that can be applied parallel to the plane without moving the crate is:

Block A, with a mass of 10 kg, rests on a 35 °\degree° incline. The coefficient of static friction is 0.40. An attached string is parallel to the incline and passes over a massless, frictionless pulley at the top. The largest mass mB, attached to the dangling end, for which A remains at rest is:

A box rests on a rough board 10 meters long. When one end of the board is slowly raised to a height of 6 meters above the other end, the box begins to slide. The coefficient of static friction is:

An automobile moves on a level horizontal road in a circle of radius 30 m. The coefficient of friction between tires and road is 0.50. The maximum speed with which this car can round this curve is:

An object of mass m and another object of mass 2m are each forced to move along a circle of radius 1.0 m at a constant speed of 1.0 m/s. The magnitudes of their accelerations are:

A ball is thrown downward from the edge of a cliff with an initial speed that is three times the terminal speed. Initially its acceleration is

Uniform circular motion is the direct consequence of:

The magnitude of the force required to cause an 0.04-kg object to move at 0.6 m/s in a circle of radius 1.0 m is:

A horizontal force of 12 N pushes a 0.5-kg bookk against a vertical wall. The book is initially at rest. If the coefficients of friction are μ\muμ s = 0.6 and μ\muμ k = 0.8 which of the following is true?

A brick slides on a horizontal surface. Which of the following will increase the frictional force on it?

An object moves around a circle. If the radius is doubled keeping the speed the same then the magnitude of the contripetal force must be:

A block is placed on a rough wooden plane. It is found that when the plane is tilted 30 °\degree° to the horizontal, the block will slide down at constant speed. The coefficient of kinetic friction of the block with the plane is:

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A 5.0-kg crate is on an incline that makes an angle 30 $\degree$ with the horizontal. If the coefficent of static friction is 0.5, the maximum force that can be applied parallel to the plane without moving the crate is:

A horizontal force of 12 N pushes a 0.5-kg bookk against a vertical wall. The book is initially at rest. If the coefficients of friction are $\mu$ _s = 0.6 and $\mu$ _k = 0.8 which of the following is true?

A block is placed on a rough wooden plane. It is found that when the plane is tilted 30 $\degree$ to the horizontal, the block will slide down at constant speed. The coefficient of kinetic friction of the block with the plane is: