# ALEX Lesson Plan

## Newton's Laws Part 2 - Newton's 3rd Law

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This lesson provided by:
 Author: Jesse Bouldin System: Alexander City School: Alexander City Board Of Education The event this resource created for: ASTA
General Lesson Information
 Lesson Plan ID: 34563 Title: Newton's Laws Part 2 - Newton's 3rd Law Overview/Annotation: As the second installment of a series of lessons on Newton's 3 Laws of Motion, this lesson focuses on Newton's Third Law. Students will take part in an activity exploring the motion of colliding objects. Students will photograph these collisions as a demonstration and explain how Newton's 3rd Law and balanced & unbalanced forces relate to their collision.This lesson results from a collaboration of the Alabama State Department of Education and ASTA.
Associated Standards and Objectives
Content Standard(s):
 Science SC2015 (2015) Grade: 8 Physical Science 10 ) Use Newton's third law to design a model to demonstrate and explain the resulting motion of two colliding objects (e.g., two cars bumping into each other, a hammer hitting a nail).* NAEP Framework NAEP Statement:: P8.16a: Forces have magnitude and direction. NAEP Statement:: P8.16b: Forces can be added. NAEP Statement:: P8.16c: The net force on an object is the sum of all the forces acting on the object. NAEP Statement:: P8.16d: A nonzero net force on an object changes the object's motion; that is, the object's speed and/or direction of motion changes. NAEP Statement:: P8.16e: A net force of zero on an object does not change the object's motion; that is, the object remains at rest or continues to move at a constant speed in a straight line. Unpacked Content Scientific And Engineering Practices:Developing and Using ModelsCrosscutting Concepts: Systems and System ModelsDisciplinary Core Idea: Motion and Stability: Forces and InteractionsEvidence Of Student Attainment:Students: Design a model of two colliding objects. Demonstrate Newton's Third Law, which states that for any pair of interacting objects, the force exerted by the first object on the second object is equal in strength to the force that the second object exerts on the first, but in the opposite direction. Use Newton's Third Law to explain the resulting motion of two colliding objects.Teacher Vocabulary:Sir Isaac Newton Newton's Third Law of Motion Force Model Mass Speed Velocity Action ReactionKnowledge:Students know: Whenever two objects interact with each other, they exert forces upon each other. These forces are called action and reaction forces; forces always come in pairs. For every action, there is an equal and opposite reaction. The size of the force on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. The momentum of an object increases if either the mass or the speed of the object increases or if both increases. The momentum of an object decreases if either the mass or the speed of the object decreases or if both decrease.Skills:Students are able to: Develop a model that demonstrates Newton's third law and identify the relevant components. Describe the relationships between components of the model. Use observations from the model to provide causal accounts for events and make predictions for events by constructing explanations.Understanding:Students understand that: Newton's Third Law states that for any pair of interacting objects, the force exerted by the first object on the second object is equal in strength to the force that the second object exerts on the first, but in the opposite direction.AMSTI Resources:AMSTI Module: Experimenting with Forces and Motion Alabama Alternate Achievement Standards AAS Standard: SCI.AAS.8.10- Describe the motion of two colliding objects before and after the collision.

Local/National Standards:

Primary Learning Objective(s):

Learning Target:

I will use the partner balance challenge to demonstrate and explain the action-reaction sequence of two objects colliding.