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Ch 9: Motion and Newton's Laws

About This Chapter

If you need to review the relationship between force and motion, check out this chapter's lessons on topics including net force and action-reaction force pairs. You'll also get another chance to study uniform circular motion and periodic motion.

Motion and Newton's Laws - Chapter Summary

Take a look at the effects of force on motion with these short video lessons. You'll find several covering the differences between inertia, mass, and weight as well as speed and velocity. You can also revisit the types of contact and non-contact forces before jumping into lessons on the relationship between the net force acting on an object, its mass, and its acceleration. Instructors walk you through calculations involving these variables and apply Newton's laws to the study of uniform circular motion, periodic motion, and objects in free fall. Altogether, lessons in this chapter can help you review the following topics:

  • Newton's laws of motion
  • Mass and weight
  • Speed and acceleration
  • Velocity
  • Types of forces
  • Free fall motion
  • Periodic motion
  • Uniform circular motion

If you have around ten minutes of free time and a mobile device, you can get one step closer to mastering these classical mechanics topics. Our online lessons break up key physics concepts into 5-10-minute videos that make it easy to manage your study time. You can also read the transcripts and take short multiple-choice quizzes to track your progress.

19 Lessons in Chapter 9: Motion and Newton's Laws
Test your knowledge with a 30-question chapter practice test
What is Motion? - Definition & Laws

1. What is Motion? - Definition & Laws

Motion is the act of moving and plays a huge role in the study of physics. This lesson walks through important terms and the laws of motion that guide the study of motion.

Newton's First Law of Motion: Examples of the Effect of Force on Motion

2. Newton's First Law of Motion: Examples of the Effect of Force on Motion

This lesson describes Newton's first law of motion, also known as the law of inertia. The interaction between force and motion is explained. Several examples are used to discuss the implications of this law on earth and in space.

Distinguishing Between Inertia and Mass

3. Distinguishing Between Inertia and Mass

Mass and inertia are both related to the amount of matter an object has, but they aren't exactly the same thing. In this video lesson, you'll see how mass affects an object's inertia, which in turn affects that object's motion.

Mass and Weight: Differences and Calculations

4. Mass and Weight: Differences and Calculations

We often talk about mass and weight as if they are the same. While they are proportional to each other, they are not, in fact, the same. In this video lesson, you will learn to distinguish between the two, as well as convert one to the other.

State of Motion and Velocity

5. State of Motion and Velocity

An object's state of motion describes how it is moving. But there are many ways we can describe motion, such as speed and velocity. This motion is relative to other objects around it, such as the earth, the sun, and even other stars in our galaxy.

Force: Definition and Types

6. Force: Definition and Types

Force is everywhere and it comes in a variety of sizes, directions, and types. In this video lesson, you'll identify force as well the different types of force that objects may experience.

Forces: Balanced and Unbalanced

7. Forces: Balanced and Unbalanced

Forces are needed to start or stop an object's motion, but can also be involved when an object is at rest or already traveling at constant velocity. In this video lesson, you'll identify the difference between balanced and unbalanced forces, understanding how they affect the movement of objects.

Free-Body Diagrams

8. Free-Body Diagrams

Forces that act on an object can be drawn through special vector diagrams called free-body diagrams. In this video lesson you'll identify how to correctly represent forces in a free-body diagram through vector arrows and force labels.

Net Force: Definition and Calculations

9. Net Force: Definition and Calculations

Because forces are vectors, we can't simply add them up to get a total amount of force on an object. Instead, we calculate the net force, which is important to understand because it tells us about an object's state of motion.

Newton's Second Law of Motion: The Relationship Between Force and Acceleration

10. Newton's Second Law of Motion: The Relationship Between Force and Acceleration

This lesson defines Newton's second law of motion. Examples are used to illustrate how unbalanced forces cause objects to accelerate. The examples are used to practice calculating acceleration and force for objects in motion.

Determining the Acceleration of an Object

11. Determining the Acceleration of an Object

Acceleration is a change in an object's state of motion. A few variables need to be identified to calculate an object's acceleration, but once we have those values, we can put them into a simple equation to find out how quickly or slowly an object's velocity is changing.

Determining the Individual Forces Acting Upon an Object

12. Determining the Individual Forces Acting Upon an Object

Objects constantly have forces acting on them whether they are moving or at rest. In this video lesson, you'll understand how to identify the individual forces acting on an object by reviewing the different types of forces and the use of free-body diagrams.

Air Resistance and Free Fall

13. Air Resistance and Free Fall

Through experiments by Galileo and Newton, we can understand why all objects in free-fall experience the same acceleration, ''g''. We can also see why air resistance affects a falling object's velocity and how this can lead to a falling object reaching a terminal velocity.

Newton's Third Law of Motion: Examples of the Relationship Between Two Forces

14. Newton's Third Law of Motion: Examples of the Relationship Between Two Forces

This lesson describes Newton's third law of motion. Examples are provided to illustrate how interacting objects experience forces. The lesson explains how objects accelerate as a result of force. Applications of Newton's third law are illustrated in nature, machines, and space.

Newton's Laws and Weight, Mass & Gravity

15. Newton's Laws and Weight, Mass & Gravity

Did you know that mass and weight are not the same? This lesson describes the difference between the two as well as the effect of gravity on weight. Examples are used to teach you how to calculate weight based on mass and acceleration of gravity.

Identifying Action and Reaction Force Pairs

16. Identifying Action and Reaction Force Pairs

Good things often come in pairs, and forces are no exception. In this lesson you'll explore Newton's second and third laws of motion to understand how action and reaction pairs affect objects interacting with each other.

The Normal Force: Definition and Examples

17. The Normal Force: Definition and Examples

The normal force is also called the contact force because it only exists when objects are touching. In this lesson, we will investigate what the normal force is and how to calculate it on flat and inclined surfaces.

Newton's Second Law & Uniform Circular Motion

18. Newton's Second Law & Uniform Circular Motion

Sure, Newton's Second Law of Motion works well in one dimension, but what happens when you put it on a curve? In this lesson, we'll see how the Second Law applies with respect to Uniform Circular Motion.

Periodic Motion: Definition & Examples

19. Periodic Motion: Definition & Examples

After completing this lesson, you should be able to define and provide examples of periodic motion, as well as describe what makes a periodic motion a simple harmonic motion.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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