# Ch 4: Force and the Laws of Motion

Watch video lessons on force and the laws of motion and learn about Newton's laws, types of force, action and reaction and more. These video lessons are short and engaging and make learning easy!

## Force and the Laws of Motion - Chapter Summary and Learning Objectives

You'll explore Newton's laws of motion in this chapter and find out how these laws are used to understand and explain weight, mass and gravity concepts. Experienced instructors teach you about friction, centripetal force and net force. You'll learn how to measure the spring constant and identify action and reaction force pairs. After you've watched all the lessons in this chapter, you'll be familiar with:

• Difference between inertia and mass
• Contact and non-contact forces
• Methods for determining net force of an object
• Relationship between force and acceleration
• Definition of inclined planes

Video Objectives
Newton's First Law of Motion: Examples of the Effect of Force on Motion Describe the interaction between force and motion and examine some applications for Newton's first law.
Distinguishing Between Inertia and Mass Explain how mass is a quantity that is solely dependent on the inertia of an object.
Mass and Weight: Differences and Calculations Differentiate between mass and weight. Calculate the weight of an object of known mass.
State of Motion and Velocity Examine how the state of motion of an object is defined by its velocity.
Force: Definition and Types Identify forces in both the contact and non-contact categories.
Forces: Balanced and Unbalanced Assess how balanced and unbalanced forces affect object movement.
Free-Body Diagrams Describe how to set up and use a free body diagram to solve problems.
Net Force: Definition and Calculations Calculate net force and use diagrams to visually represent forces acting on an object.
Newton's Second Law of Motion: The Relationship Between Force and Acceleration Understand how to calculate for acceleration and force and describe the relationship between these concepts.
Determining the Acceleration of an Object Identify the variables needed to determine the acceleration of an object.
Determining the Individual Forces Acting Upon an Object Use free-body diagrams to identify the forces acting on an object.
Air Resistance and Free Fall Describe the effect of air resistance on the velocity of free falling objects.
Newton's Third Law of Motion: Examples of the Relationship Between Two Forces Demonstrate how objects accelerate because of force and apply Newton's third law.
Newton's Laws and Weight, Mass & Gravity Use Newton's laws to understand the concepts of weight, mass, and gravity.
Identifying Action and Reaction Force Pairs Explain how objects interacting with each other are affected by action and reaction force pairs.
The Normal Force: Definition and Examples Describe normal force and explain why it's known as the support force.
Friction: Definition and Types Discuss the two types of friction force - static friction and sliding friction.
Inclined Planes in Physics: Definition, Facts, and Examples Describe an inclined plane and explain the forces acting on an object on an inclined plane.
Hooke's Law and the Spring Constant: Definition and Equation Define Hooke's law and measure the spring constant.
The Centripetal Force Requirement: Definition, Examples, & Problems Describe centripetal force and explain how it is calculated. Solve problems involving calculations of centripetal force.

21 Lessons in Chapter 4: Force and the Laws of Motion
Test your knowledge with a 30-question chapter practice test
Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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