Q: A 2 kg object is acted upon by two forces: $$F_1 = 6$$\ \mathrm{N}$$ to the right and F_2$ = 4\ \mathrm{N} to $$the left. What is the acceleration of the object?

$$a = 1\ \mathrm{m/s^2$}$$\ \text{to the right}

Q: A 10 kg mass is hanging from a rope. If the rope is pulled upward with a force of 120 N, what is the acceleration of the mass? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

$$a = 2.2\ \mathrm{m/s^2$}$$\ \text{upward}

Question 1

A 2 kg block is resting on a horizontal surface. A horizontal force of 10 N is applied to the block, and the coefficient of kinetic friction between the block and the surface is 0.2. What is the acceleration of the block? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$a = 3.02\ \mathrm{m/s^2$}$$

Question 2

Which of the following statements best describes Newton's 1st Law?

Accepted Answer

An object will remain at rest or in uniform motion in a straight line unless acted upon by a nonzero net force.

Question 3

A 5 kg object is suspended by a rope. What is the tension in the rope if the object is at rest? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$T = 49\ \mathrm{N}$$

Question 4

A car of mass 1000 kg accelerates from rest to $$20\ \mathrm{m/s} in 10 $$seconds. What is the net force acting on the car?

Accepted Answer

$$F = 2000\ \mathrm{N}$$

Question 5

Which of the following is an example of a long-range force?

Accepted Answer

Gravitational force between the Earth and the Moon

Question 6

A 3 kg object is pulled upward with a force of 40 N. What is the acceleration of the object? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$a = 3.73\ \mathrm{m/s^2$}$$

Question 7

Which of the following best illustrates Newton's 3rd Law?

Accepted Answer

A rocket propelling itself upward by expelling exhaust gases downward

Question 8

A 0.5 kg ball is dropped from rest. What is its weight on Earth? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$W = 4.9\ \mathrm{N}$$

Question 9

Which of the following is NOT a property of force according to the study materials?

Accepted Answer

Forces are scalar quantities

Question 10

A 10 kg box is pulled across a horizontal floor with a constant velocity by a force of 30 N. What is the coefficient of kinetic friction between the box and the floor? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$\mu_k = 0.31$$

Question 11

Which of the following statements about weight is correct?

Accepted Answer

Weight depends on location, while mass does not.

Question 12

A 2 kg object is acted upon by two forces: $$F_1 = 6$$\ \mathrm{N}$$ to the right and F_2$ = 4\ \mathrm{N} to $$the left. What is the acceleration of the object?

Accepted Answer

$$a = 1\ \mathrm{m/s^2$}$$\ 	ext{to the right}

Question 13

A 70 kg astronaut weighs less on the Moon than on Earth. If the acceleration due to gravity on the Moon is $$1.6\ \mathrm{m/s^2$}$$, what is the astronaut's weight on the Moon?

Accepted Answer

$$W = 112\ \mathrm{N}$$

Question 14

Which of the following is NOT a contact force?

Accepted Answer

Gravitational force

Question 15

A 1 kg object is moving at a constant velocity. Which statement is true about the net force acting on the object?

Accepted Answer

The net force is zero.

Question 16

A 4 kg object is acted upon by a net force of 20 N. What is its acceleration?

Accepted Answer

$$a = 5\ \mathrm{m/s^2$}$$

Question 17

A 10 kg mass is hanging from a rope. If the rope is pulled upward with a force of 120 N, what is the acceleration of the mass? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$a = 2.2\ \mathrm{m/s^2$}$$\ 	ext{upward}

Question 18

Which of the following best describes the role of a free-body diagram in solving Newton's 2nd Law problems?

Accepted Answer

It helps identify all forces acting on an object and their directions.

Question 19

A 2 kg block is attached to a rope and pulled upward at a constant velocity. What is the tension in the rope? (Take $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$T = 19.6\ \mathrm{N}$$

Question 20

A 1 kg object is acted upon by a net force of 5 N at an angle of $$60^\circ$$ above the horizontal. What is the vertical component of the acceleration?

Accepted Answer

$$a_y = 4.33\ \mathrm{m/s^2$}$$

Newton's Laws of Motion and Types of Forces

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