# Ch 1: Motion & Forces

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### About This Chapter

## Motions and Forces - Chapter Summary and Learning Objectives

In this chapter, you'll learn about the basic scientific factors that are used to describe and graph moving objects, including position, speed and time. Using easy-to-follow visuals, the instructor will explain the relationship between force and motion, or how pulling and pushing actions can cause objects to change direction, form or pace. The different types of force will be discussed, including points of contact and non-contact influences, such as weight.

Through this series of entertaining videos, you'll have the chance to see how Sir Isaac Newton's three laws of motion apply to Earth-bound objects and those in space, as well as the human body. A key part of the chapter will illustrate the important distinction between mass and weight, which will help you understand how the astronauts moved about so effortlessly on the moon. When you've finished watching the videos and taking the self-assessment quizzes, you should be able to:

- Perform calculations involving distance, speed and time
- Understand what is meant by contact, non-contact, balanced and unbalanced forces
- Identify the guiding principles behind Newton's laws of motion
- Understand how gravity keeps our solar system intact

Video | Objective |
---|---|

What is Position? | Define position in relationship to a standard reference point and set of reference directions. |

Speed and Velocity: Concepts and Formulas | Describe what is meant by speed and velocity, and provide the formulas. |

Practice Solving Problems of Distance, Time and Average Speed | Solve real-world practice problems involving distance, speed and time. |

Interpret Graphs of Position vs. Time and Speed vs. Time | Understand the relationship between position and time or time and speed as depicted on a graph. |

Force: Definition and Types | Define force. Differentiate between contact and non-contact force. |

Objects with Two or More Forces | Understand the cumulative effect of all forces as the result of two or more forces acting simultaneously on an object. |

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

Newton's Second Law of Motion: The Relationship between Force and Acceleration | Describe Newton's Second Law of Motion. |

Newton's Third Law of Motion: Examples of the Relationship between Two Forces | Explain Newton's Third Law of Motion. |

Forces: Balanced and Unbalanced | Compare balanced and unbalanced forces. |

Newton's Laws and Weight, Mass and Gravity | Discuss how mass, gravity and weight relate according to Newton's laws. |

Role of Gravity in the Solar System | Understand the role of gravity in forming and maintaining the shapes of planets, starts and the solar system. |

### 1. What is Position in Physics? - Definition & Examples

After watching this video, you will be able to explain what position is, why it is a vector, and interpret position-time graphs. A short quiz will follow.

### 2. 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.

### 3. Distance, Time & Average Speed: Practice Problems

After watching this video, you will be able to explain what distance is, explain how it relates to change in position, and calculate the average speed in various situations. A short quiz will follow.

### 4. Graphing Position & Speed vs Time: Practice Problems

After watching this video, you will be able to explain what position and speed are. You will also be able to plot position vs. time and speed vs. time graphs. A short quiz will follow.

### 5. 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.

### 6. Objects with Two or More Forces: Finding the Total Force Result

After watching this video, you will be able to explain what a force is and how it relates to motion, and find the total force result in a variety of force situations. A short quiz will follow.

### 7. 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.

### 8. 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.

### 9. 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.

### 10. 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.

### 11. 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.

### 12. Gravity in the Solar System: Shaping Planets & Stars

After watching this video, you will be able to explain what gravity is, and the role it plays in forming the shapes of planets and stars. A short quiz will follow.

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### Other Chapters

Other chapters within the Physical Science: Middle School course