About This Chapter
How It Works:
- Identify the lessons in Holt McDougal Physics' Forces and the Laws of Motion chapter with which you need help.
- Find the corresponding video lessons within this companion course chapter.
- Watch fun videos that cover the forces and laws of motion topics you need to learn or review.
- Complete the quizzes to test your understanding.
- If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.
Students will learn:
- Types of force
- Balanced and unbalanced forces
- Free-body diagrams
- Newton's Laws of Motion
- The difference between mass and inertia
- Net force calculations
- How mass and weight are different
- Examples of the normal force
- Types of friction
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1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. What is Torque? - Definition, Equation & Calculation
You've probably heard of torque before, maybe while discussing cars. Now learn what it really is, and what it has to do with rotational equilibrium. Then, work through an example problem that combines the two.
12. 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.
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Other chapters within the Holt McDougal Physics: Online Textbook Help course
- Holt McDougal Physics Chapter 1: The Science of Physics
- Holt McDougal Physics Chapter 2: Motion in One Dimension
- Holt McDougal Physics Chapter 3: Two-Dimensional Motion and Vectors
- Holt McDougal Physics Chapter 5: Work and Energy
- Holt McDougal Physics Chapter 6: Momentum and Collisions
- Holt McDougal Physics Chapter 7: Circular Motion and Gravitation
- Holt McDougal Physics Chapter 8: Fluid Mechanics
- Holt McDougal Physics Chapter 9: Heat
- Holt McDougal Physics Chapter 10: Thermodynamics
- Holt McDougal Physics Chapter 11: Vibrations and Waves
- Holt McDougal Physics Chapter 12: Sound
- Holt McDougal Physics Chapter 13: Light and Reflection
- Holt McDougal Physics Chapter 14: Refraction
- Holt McDougal Physics Chapter 15: Interference and Diffraction
- Holt McDougal Physics Chapter 16: Electric Forces and Fields
- Holt McDougal Physics Chapter 17: Electrical Energy and Current
- Holt McDougal Physics Chapter 18: Circuits and Circuit Elements
- Holt McDougal Physics Chapter 19: Magnetism
- Holt McDougal Physics Chapter 20: Electromagnetic Induction
- Holt McDougal Physics Chapter 21: Atomic Physics
- Holt McDougal Physics Chapter 22: Subatomic Physics