About This Chapter
Force, Motion and Newton's Laws - Chapter Summary
Isaac Newton's laws of motion describe the relationship between a body and the forces that act upon it. In the lessons in this chapter, expert instructors discuss Newton's laws and use real-world examples to describe the motion of the body in response to outside forces. You will explore gravity, weight, and mass. Other lessons examine devices that work because of Newton's laws, such as the pulley and inclined plane. If you struggle with any of these topics, our instructors will be here to answer any questions you have about the material. This chapter can help you:
- Understand Newton's three laws of motion
- Explain Newton's laws on weight, mass and gravity
- Describe differences between inertia and mass
- Explore how mass and weight are calculated
- Understand state of motion
- Name types of force
- Compare balance and unbalanced force
- Describe free-body diagrams
- Show how net force is calculated
- Calculate the acceleration of an object
- Describe air resistance
- Identify action and reaction force pairs
- Give examples of normal force
- List types of friction
- State facts about inclined planes in physics
- Provide information on buoyancy
- Perform equations involving linear momentum
- Execute lab work on various topics of force, motion and Newton's laws
1. 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.
2. 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.
3. Newton's First Law: Physics Lab
After watching this lesson, you will be able to explain what Newton's First Law is and describe some physics labs/demonstrations that provide evidence for the law in real life. A short quiz will follow.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. Newton's Second Law: Physics Lab
After watching this lesson, you will be able to explain Newton's 2nd Law and use real-life evidence to show that the basic ideas behind the equation are correct. A short quiz will follow.
12. Forces Imposed on Objects: Physics Lab
After watching this video, you will be able to explain what a force is and complete an investigation of what forces are required to move various objects. A short quiz will follow.
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. 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.
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.
16. Acceleration & Gravity: Physics Lab
After watching this video, you will be able to explain how objects fall under gravity. You will also learn how to prove, by experiment, that the acceleration due to gravity is approximately 9.8 m/s/s. A short quiz will follow.
17. 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.
18. Newton's Third Law: Physics Lab
After watching this lesson and completing the lab, you will be able to explain what Newton's 3rd Law is, and use an equation to show why two forces can be equal and opposite, and still lead to two objects moving in different ways. A short quiz will follow.
19. 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.
20. 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.
21. 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.
22. 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.
23. Inclined Planes in Physics: Definition, Facts, and Examples
If an object is not horizontal to the ground, it may be on an inclined plane. We need to adjust both the calculations and the free-body diagram when determining the net force on an object on an inclined plane. Learn how in this lesson.
24. Buoyancy: Calculating Force and Density with Archimedes' Principle
Knowledge of the buoyant force is important when trying to understand why some objects float while other objects sink. In this lesson you'll learn about this unique force and how we apply it to various situations using Archimedes' Principle.
25. Density & Buoyancy of Objects: Physics Lab
After completing this lab, you will be able to explain what buoyancy is, how to determine the size of the buoyant force, and use the principles of buoyancy to calculate the density of an object. A short quiz is available to test your knowledge after the lab.
26. Linear Momentum: Definition, Equation, and Examples
Any moving object has momentum, but how much momentum it has depends on its mass and velocity. In this lesson, you'll identify linear momentum, as well as see examples of how an object's momentum is affected by mass and velocity.
27. Conservation of Momentum: Physics Lab
After completing this lab, you will be able to explain what conservation of momentum is and conduct an experiment to demonstrate conservation of momentum. You can also take the short quiz to test your knowledge.
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Other chapters within the Physical Science: High School course
- Understanding Matter
- Understanding Gases
- Understanding the Atom & Atomic Structure
- The Periodic Table
- Understanding Chemical Bonding
- Understanding Solutions
- Acids, Bases and Chemical Reactions
- Understanding Motion
- Work, Energy, Power, and Thermodynamics
- Waves and Sound in Physical Science
- Light in Physical Science
- Electricity Fundamentals
- The Universe