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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