Ch 26: Principles of Force & Motion

About This Chapter

This chapter on the principles of force and motion defines a large number of subject-relevant concepts while demonstrating relevant formulas and calculations. You'll look at topics such as net force, friction, acceleration, and more.

Principles of Force & Motion - Chapter Summary

This chapter examines a variety of laws related to force and motion. It includes information on the forms these concepts can take and provides examples of them in action. You'll learn about velocity, air resistance, and all of the following:

  • Balanced and unbalanced forces
  • The normal force
  • Spotting action and reaction force pairs
  • Individual forces that can act upon objects
  • Translational and rotational motion
  • Determining object displacement
  • Velocity vs. time graphs

With both a video and transcript of each lesson, you can choose whether to watch or read the material topic-by-topic while checking your understanding of the content via practice quizzes. If find yourself stuck, our professional instructors are available to answer your questions through the help tab.

15 Lessons in Chapter 26: Principles of Force & Motion
Test your knowledge with a 30-question chapter practice test
Forces: Balanced and Unbalanced

1. 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.

Net Force: Definition and Calculations

2. 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.

The Normal Force: Definition and Examples

3. 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.

Identifying Action and Reaction Force Pairs

4. 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.

Determining the Individual Forces Acting Upon an Object

5. 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.

Friction: Definition and Types

6. Friction: Definition and Types

You experience friction all the time, and you should be glad you do! Friction helps keep stationary objects in place as well as slow moving objects down as they slide across a surface. This lesson identifies what friction is and explains the two ways we find this force on earth.

Differences Between Translational & Rotational Motion

7. Differences Between Translational & Rotational Motion

After watching this lesson, you'll be able to explain the difference between translational and rotational motion, explain how translational quantities are replaced by rotational ones in physics and apply Newton's First Law to rotation. A short quiz follows.

State of Motion and Velocity

8. 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.

Speed and Velocity: Concepts and Formulas

9. Speed and Velocity: Concepts and Formulas

Did you know that an object's speed and velocity may not be the same? This lesson describes the concepts of speed and velocity relating to objects in motion. We'll look at a specific example to help learn how to calculate both speed and velocity.

Velocity vs. Time: Determining Displacement of an Object

10. Velocity vs. Time: Determining Displacement of an Object

There is a lot of information you can determine by looking at a velocity vs. time graph. In this lesson, we will use a little geometry to calculate the displacement of the object represented by the graph.

Using Velocity vs. Time Graphs to Describe Motion

11. Using Velocity vs. Time Graphs to Describe Motion

In this lesson, we will look at an example of a velocity vs. time graph. By examining the shape of the graph, it is possible to accurately describe the motion of an object, even if that motion is very complex.

What is Acceleration? - Definition and Formula

12. What is Acceleration? - Definition and Formula

This lesson describes the difference between speed, velocity and acceleration. Examples are used to help you understand the concept of acceleration and learn to calculate acceleration with a mathematical formula.

Determining the Acceleration of an Object

13. 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.

The Acceleration of Gravity: Definition & Formula

14. The Acceleration of Gravity: Definition & Formula

In this lesson, we will introduce the acceleration due to gravity. Objects in free fall are one of the few real world examples of straight line motion with constant acceleration, so they are commonly used when learning kinematics.

Air Resistance and Free Fall

15. 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.

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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