Q: A $5.0 \\ \mathrm{kg}$ box slides on the surface of a ramp that rises at $37^\\circ$ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is $0.40$. What are the magnitude and direction of the acceleration of the box if it is sliding up the ramp?

$6.1 \\ \mathrm{m/s^2}$, down the ramp

Q: A $5.0 \\ \mathrm{kg}$ box slides on the surface of a ramp that rises at $37^\\circ$ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is $0.40$. What are the magnitude and direction of the acceleration of the box if it is sliding up the ramp?

$6.1 \\ \mathrm{m/s^2}$, down the ramp

Q: A $5.0 \\ \mathrm{kg}$ box slides on the surface of a ramp that rises at $37^\\circ$ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is $0.40$. What are the magnitude and direction of the acceleration of the box if it is sliding up the ramp?

$6.1 \\ \mathrm{m/s^2}$, down the ramp

Q: A $5.0 \\ \mathrm{kg}$ box slides on the surface of a ramp that rises at $37^\\circ$ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is $0.40$. What are the magnitude and direction of the acceleration of the box if it is sliding up the ramp?

$6.1 \\ \mathrm{m/s^2}$, down the ramp

Question 1

An astronaut weighs 99 N on Earth. On the Moon, where the acceleration due to gravity is $1.62 \ \mathrm{m/s^2}$, how much does the astronaut weigh?

Accepted Answer

$C: 16.4 \ \mathrm{N}$

Question 2

A block is on a frictionless table, on Earth. The block accelerates at $5.3 \ \mathrm{m/s^2}$ when a $10 \ \mathrm{N}$ horizontal force is applied. What is the mass of the block?

Accepted Answer

$1.9 \ \mathrm{kg}$

Question 3

An object that weighs $75 \ \mathrm{N}$ is pulled on a horizontal surface by a horizontal pull of $50 \ \mathrm{N}$ to the right. The friction force on the object is $30 \ \mathrm{N}$ to the left. What is the net force acting on the object?

Accepted Answer

$20 \ \mathrm{N}$

Question 4

A $50.0 \ \mathrm{kg}$ crate is being pulled along a horizontal smooth surface. The pulling force is $100.0 \ \mathrm{N}$ directed $20^\circ$ above the horizontal. What is the magnitude of the acceleration of the crate?

Accepted Answer

$D: 1.88 \ \mathrm{m/s^2}$

Question 5

A $10 \ \mathrm{kg}$ block is released from rest at the top of a frictionless ramp that is $2.0 \ \mathrm{m}$ high. What is the speed of the block at the bottom of the ramp?

Accepted Answer

$6.3 \ \mathrm{m/s}$

Question 6

A $1000 \ \mathrm{N}$ piano is lifted by two ropes. The first rope hangs at $30^\circ$ to the left of the vertical and the second at $60^\circ$ to the right of the vertical. What is the tension in the first wire?

Accepted Answer

$B: 500 \ \mathrm{N}$

Question 7

Three blocks, light connecting ropes, and a light frictionless pulley comprise a system. A constant force $P$ is applied downward on block A, causing block B to accelerate downward at $2.5 \ \mathrm{m/s^2}$. The tension in the rope connecting block B and block C is equal to $60 \ \mathrm{N}$. What is the magnitude of the force $P$?

Accepted Answer

$190 \ \mathrm{N}$

Question 8

A $5.0 \ \mathrm{kg}$ box slides on the surface of a ramp that rises at $37^\circ$ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is $0.40$. What are the magnitude and direction of the acceleration of the box if it is sliding up the ramp?

Accepted Answer

$6.1 \ \mathrm{m/s^2}$, down the ramp

Question 9

A $10 \ \mathrm{kg}$ block is released from rest at the top of a frictionless ramp that is $2.0 \ \mathrm{m}$ high. What is the speed of the block at the bottom of the ramp?

Accepted Answer

$6.3 \ \mathrm{m/s}$

Question 10

A $5.0 \ \mathrm{kg}$ box slides on the surface of a ramp that rises at $37^\circ$ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is $0.40$. What are the magnitude and direction of the acceleration of the box if it is sliding up the ramp?

Accepted Answer

$6.1 \ \mathrm{m/s^2}$, down the ramp

Question 11

A car travels at $20 \ \mathrm{m/s}$ on a horizontal highway that is a circular curve with a radius of $740 \ \mathrm{m}$. If the coefficient of static friction between the roadway and the tires is $0.40$, what would be the maximum safe driving speed for this curve?

Accepted Answer

$54 \ \mathrm{m/s}$

Question 12

A $5.0 \ \mathrm{kg}$ box slides on the surface of a ramp that rises at $37^\circ$ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is $0.40$. What are the magnitude and direction of the acceleration of the box if it is sliding up the ramp?

Accepted Answer

$6.1 \ \mathrm{m/s^2}$, down the ramp

Question 13

Two packages are connected by a very light string that goes over an ideal pulley as shown in the figure. Package A has a mass of $3.0 \ \mathrm{kg}$ and is placed on a rough plane inclined at $30^\circ$ above the horizontal. The string acts on package A sliding up the ramp. The coefficient of static friction between package A and the plane is $0.40$. What minimum mass should package B have in order to start package A sliding up the ramp?

Accepted Answer

$2.5 \ \mathrm{kg}$

Question 14

A $10 \ \mathrm{kg}$ block is released from rest at the top of a frictionless ramp that is $2.0 \ \mathrm{m}$ high. What is the speed of the block at the bottom of the ramp?

Accepted Answer

$6.3 \ \mathrm{m/s}$

Question 15

A $5.0 \ \mathrm{kg}$ box slides on the surface of a ramp that rises at $37^\circ$ above the horizontal. The coefficient of kinetic friction between the box and the ramp surface is $0.40$. What are the magnitude and direction of the acceleration of the box if it is sliding up the ramp?

Accepted Answer

$6.1 \ \mathrm{m/s^2}$, down the ramp

Forces, Friction, and Newton's Laws: Physics Exam Study Notes

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