About This Chapter
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Earning College Credit
Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.
To learn more, visit our Earning Credit Page
Transferring credit to the school of your choice
Not sure what college you want to attend yet? Study.com has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.
Other chapters within the National Board Certification Exam - Science/Adolescence & Young Adulthood: Practice & Study Guide course
- Understanding Students as a Teacher
- Scientific Experiments & Research
- History of Scientific Advances
- Earth Science Overview
- Rocks & Minerals
- Igneous Rocks Basics
- Sedimentary Rocks: A Deeper Look
- Metamorphic Rocks
- Geological Forms
- Biochemical Cycles
- Energy Science
- Severe Weather & Disturbances
- Space Science Overview
- Sun-Earth-Moon System
- Astronomical Observations
- Life Sciences Overview
- Mitosis & Meiosis
- Male Reproductive System
- Female Reproductive System
- Physiology I: The Circulatory, Respiratory, Digestive, Excretory, and Musculoskeletal Systems
- Physiology II: The Nervous, Immune, and Endocrine Systems
- Plant Biology
- Plant Reproduction and Growth
- Physical Science Overview
- Work, Power & Energy
- Momentum & Conservation
- Work & Machines
- Sound & Light
- Atomic Structure in Chemistry
- Trends of the Periodic Table
- Elements, Compounds & Mixtures
- Types of Reactions in Chemistry
- Understanding Chemical Bonds
- Curriculum & Instruction Design
- Assessments & Feedback in Education
- Learning Environment in Schools
- Family & Community Partnerships in Education
- Advancing Professionalism in Education
- Diversity & Equality in the Classroom
- Effective Teaching & Teacher Reflection
- National Board Certification Exam - Science/Adolescence & Young Adulthood Flashcards