# Ch 12: Force & Motion in Physics

### About This Chapter

## Force & Motion in Physics - Chapter Summary

What are planes and dimensions? What are Newton's laws of motion? Which equations apply to net force? These questions represent the kinds of topics you will find addressed in these brief lessons. Examples and illustrations support the text to help clarify any complex information and ensure your full understanding of these topics. Once you have completed your review of this chapter, you should be able to:

- Explain the difference between planes and dimensions
- Apply equations for net force
- Discuss Newton's law of gravity
- Calculate the magnitude and direction of vectors
- Provide details about Newton's first, second and third laws of motion
- Understand when to add vectors
- Solve rotational dynamics problems
- Use rotational and translational equilibrium to find the effects of forces on an object

You can track your progress through the chapter on your Dashboard. Lessons are accessible from any device, at any time, so you can study at your own pace. Determine how much you have learned and whether you need further review by taking the self-assessment quizzes that accompany each lesson.

### 1. Forces: Planes & Dimensions

Forces can act on an object in one, two or three dimensions. Sometimes they act simultaneously. In this lesson, we will investigate planar forces and how to determine the net force on an object.

### 2. What is Net Force? - Definition, Magnitude & Equations

In this lesson, we will define net force, and explore the magnitude of a net force, the relevant equations and examples that will help make the concept of net force clearer.

### 3. Isaac Newton's Formula for the Force of Gravity: Definition & Example

Watch this video lesson and you will see how you can calculate the force of attraction between two objects. Learn why our planets don't spin themselves out of orbit around the sun.

### 4. Vector Components: The Magnitude of a Vector

After watching this lesson, you will be able to explain what the magnitude of a vector refers to, and how to calculate it when given the components of a vector. A short quiz will follow.

### 5. Vector Components: The Direction of a Vector

After watching this lesson, you will be able to explain what is meant by the direction of a vector and calculate the direction of a vector when given the x and y components. A short quiz will follow.

### 6. 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.

### 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. Vector Addition (Geometric Approach): Explanation & Examples

After watching this video, you will be able to explain why we might need to add two vectors and, given magnitudes and directions, add two vectors using geometric methods. A short quiz will follow.

### 10. Torque: Concept, Equation & Example

After watching this lesson, you will be able to explain what torque is conceptually and mathematically and use both the equation and Newton's First Law for rotation to solve problems involving torque. A short quiz will follow.

### 11. Equilibrium: Translational & Rotational

Learn about the requirements for an object to be under translational or rotational equilibrium. Then work through a couple example problems that show how we can use translational and rotational equilibrium to find the forces acting on an object.

### 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

Other chapters within the VCE Physics: Exam Prep & Study Guide course

- Overview of Thermodynamics
- Thermodynamics & Climatology
- Energy Conservation & Efficiency
- Modeling Electricity
- Circuit Electricity
- Electronic Device Use & Safety
- Electricity Generation & Transmission
- Origins of the Universe
- Subatomic Particles in the Nucleus
- Atomic Energy
- Modeling Motion
- Energy & Motion in Physics
- Laws of Motion Applied Problem Solving
- The Theory of Relativity
- Interactions of Fields in Physics
- Effects of Fields in Physics
- Applications of Fields in Physics
- Properties of Mechanical Waves
- Light as an Electromagnetic Wave
- Wave-Particle Duality & Quantum Mechanics
- Conducting a Scientific Investigation
- Scientific Investigation for the VCE Physics Exam
- VCE Physics Flashcards