# Ch 12: Newton's Laws in Astronomy

Watch online science video lessons to learn about balanced and unbalanced forces, acceleration, inertia, free fall motion and other topics related to Newton's laws of astronomy.

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

Let instructors teaching this chapter demonstrate the physics at work in everything from the simplest action-reaction force pairs to the gravity and normal forces that keep us stable. You can also discover equations used to calculate mass, acceleration and other variables accounted for by Newton's laws of motion. Lessons in this chapter are designed to teach you how to do the following:

• List types of contact and non-contact forces
• Calculate the net force acting on an object
• Describe the relationship between weight, mass and gravity
• Calculate the acceleration of an object
• Interpret a free-body diagram

Video Objectives
Newton's First Law of Motion: Examples of the Effect of Force on Motion Use Newton's first law of motion to examine unbalanced and balanced forces, inertia and friction.
Distinguishing Between Inertia and Mass Learn how an object's mass affects its inertia.
Mass and Weight: Differences and Calculations Differentiate mass from weight. Get tips for using one variable to calculate the other.
State of Motion and Velocity Learn how to define the speed and velocity of an object in motion. Study the effects of circular motion on velocity.
Force: Definition and Types Get examples of contact forces, like friction, air resistance and applied force. Explore non-contact forces, such as gravity and magnetic force.
Forces: Balanced and Unbalanced Examine the static and dynamic equilibriums of objects with balanced forces. Learn how unbalanced forces cause an object's state of motion to change.
Free-Body Diagrams Discover the vector diagrams used to depict the magnitude and direction of forces acting on an object.
Net Force: Definition and Calculations Learn how to add or subtract forces acting on an object in order to determine the net force.
Newton's Second Law of Motion: The Relationship Between Force and Acceleration Apply Newton's second law of motion to describe how net force and mass can be used to calculate acceleration.
Determining the Acceleration of an Object Practice finding the acceleration of an object when given the change in velocity and the change in time.
Determining the Individual Forces Acting Upon an Object Get tips for determining whether such forces as gravity, normal force, friction or tension are acting on an object.
Air Resistance and Free Fall Examine the acceleration of objects in free fall. Describe the effect of air resistance and mass.
Newton's Third Law of Motion: Examples of the Relationship Between Two Forces Learn how action-reaction force pairs demonstrate Newton's third law of motion.
Newton's Laws and Weight, Mass & Gravity Study the effect of gravity on the acceleration and weight of falling objects.
Identifying Action and Reaction Force Pairs Identify the effect of an object's mass in action-reaction force pairs.
The Normal Force: Definition and Examples Examine how the force exerted by surfaces works with gravity to keep things in place.
Friction: Definition and Types Differentiate between static and sliding friction.

Final Exam
Chapter Exam

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