# Ch 4: Newton's Laws in Physics

Watch online video lessons to learn about inertia, mass, net force, friction and more. Each lesson is accompanied by a short multiple-choice quiz you can use to check your understanding of these science topics.

## Newton's Laws - Chapter Summary and Learning Objectives

Use this chapter on Newton's laws of motion to reexamine the physics behind phenomena we encounter in everyday life, whether it's the action-reaction force pairs that result from the simple act of sitting down or the inertia we face when getting up. You can also explore how pulleys and planes put these concepts to work. This chapter is designed to teach you the following:

• Difference between mass and weight
• Types of contact and non-contact forces
• Relationships between mass, velocity and motion
• Mechanics of simple machines

Video Objective
Newton's First Law of Motion: Examples of the Effect of Force on Motion Explains the effect of force on motion and defines key terms, including velocity and inertia.
Inertia and Mass Distinguishes between mass and inertia by illustrating how mass is a quantity that is solely dependent upon the inertia of an object.
Mass and Weight Differentiates between these two variables by describing how to calculate the weight of an object of known mass.
State of Motion Shows how the state of motion of an object is defined by its velocity.
Force: Definition and Types Defines and identifies forces in both the contact and non-contact categories.
Forces: Balanced and Unbalanced Outlines the differences between balanced and unbalanced forces and shows how they relate to an object's motion.
Free-Body Diagrams Uses free body diagrams to illustrate the relative magnitude and direction of all forces acting upon an object in a given situation.
Net Force Defines net force and shows how to determine the net force of an object.
Newton's Second Law of Motion: The Relationship Between Force and Acceleration Explains implications of the relationship between net force and acceleration and provides formulas for calculating net force.
Determining the Acceleration of an Object Demonstrates formulas for using average acceleration, final velocity, initial velocity and time to determine the acceleration of an object.
Determining the Individual Forces Acting Upon an Object Shows how to determine the contact and non-contact forces acting upon an object.
Air Resistance and Free Fall Explains why objects ultimately reach terminal velocity as well as why more massive objects fall faster than less massive objects when they encounter air resistance.
Newton's Third Law of Motion: Examples of the Relationship Between Two Forces Depicts the relationship between action and reaction forces on an object.
Newton's Laws and Weight, Mass & Gravity Uses Newton's laws to understand the relationships between distance and gravity, mass and gravity and acceleration and gravity.
Identifying Action and Reaction Force Pairs Illustrates action-reaction force pairs by identifying the two interacting objects and describing who is pushing on whom and in what direction.
The Normal Force Provides examples of the type of force exerted on a resting object.
Friction Defines friction and discusses the two types of friction force - static friction and sliding friction.
Pulleys Describes the basic mechanics of pulleys used to transfer the force required for work.
Inclined Planes Explains the forces acting upon an object on an inclined plane.
Uniform Circular Motion Uses Newton's second law of motion to describe the net force, velocity and acceleration of an object traveling in a circle.

Final Exam
Chapter Exam

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