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Grade Level: 7 (68)
Choose From: 5 lessons and 9 activities
Subject Areas: Algebra, Physical Science, Physics
Summary
By taking a look at the energy of motion all around us, students learn about the types of energy and their characteristics. They first learn about the two simplest forms of mechanical energy: kinetic and potential energy, as illustrated by pendulums and roller coasters. They come to understand that energy can change from one form into another, and be described and determined by equations. Through the example of a waterwheel, the concepts of and differences between work and power are explained and calculated. Conservation of momentum and collisions are explored, with analogies to popular sports (billiards, baseball, golf), and how elastic and inelastic collisions are considered in the games' design. To show another energy transformation concept, the behavior of energy dissipating into heat by means of friction is presented. Students learn to recognize static friction, kinetic friction and drag, how they work, and how to calculate frictional force. A final lesson integrates the energy of motion concepts, showing how they are interconnected in everyday applications such as skateboards, scooters, roller coasters, trains, cars, planes, trucks and elevators. Through numerous handson activities, students swing pendulums, use plastic twoliter bottles to construct model waterwheels, bounce different types of balls, use weights to generate friction data, and roll balls down ramps to collide into cups.Engineering Connection
Understanding mechanical energy, or the energy of motion, is at the root of so many engineering applications in our world. Engineers design a wide range of consumer and industry devices—vehicles, appliances, computer hardware, factory equipment and even roller coasters—that use mechanical motion. To do this, they pay close attention to how energy is generated, stored and moved. Whether designing elevators, power plants or race cars, engineers take into consideration the concepts of work and power. Engineers collaborate to design dams that generate electricity from the flow of water. Part of this process involves calculations to determine how much power can be generated. Engineers incorporate what they know about momentum and collisions to design protective "crumple zones" and safety devices into vehicles to absorb most of the energy being transferred during a crash. In sports such as baseball and golf, investigating how the human body and equipment interacts with the ball during impact helps engineers design better and safer sports equipment. To reduce drag force and thus improve gas mileage, engineers design vehicles to be more aerodynamic. Engineers understand friction and use it to help control motion; some engineers design braking systems that prevent skidding. When designing vehicles—everything from push scooters to light rail trains to your car—engineers take into account all of the energy of motion concepts, because in real life, these forces are happening and interacting at the same time.
Unit Overview
Overview of topics by lesson: 1) introduction to mechanical energy, specifically potential and kinetic energy and the concept of conservation of energy, 2) examination of waterwheels to learn about work and power and use equations to calculate work and power, 3) more on potential and kinetic energy, plus momentum, elastic and inelastic collisions, and an exploration of sports and games that illustrate the concepts, including conservation of momentum, 4) friction, drag, velocity, converting energy of motion to heat and calculating frictional force, and 5) tying together the concepts from the first four lessons, showing how they interconnect in everyday applications. For four of the activities, a high school version is also provided.
Educational Standards
Each TeachEngineering lesson or activity is correlated to one or more K12 science,
technology, engineering or math (STEM) educational standards.
All 100,000+ K12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN),
a project of D2L (www.achievementstandards.org).
In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics;
within type by subtype, then by grade, etc.
Each TeachEngineering lesson or activity is correlated to one or more K12 science, technology, engineering or math (STEM) educational standards.
All 100,000+ K12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN), a project of D2L (www.achievementstandards.org).
In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics; within type by subtype, then by grade, etc.
NGSS: Next Generation Science Standards  Science

Construct, use, and present arguments to support the claim that when the kinetic energy of an object changes, energy is transferred to or from the object.
(Grades 6  8 )
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This Performance Expectation focuses on the following Three Dimensional Learning aspects of NGSS:Science & Engineering Practices Disciplinary Core Ideas Crosscutting Concepts Construct, use, and present oral and written arguments supported by empirical evidence and scientific reasoning to support or refute an explanation or a model for a phenomenon. Alignment agreement:
Science knowledge is based upon logical and conceptual connections between evidence and explanations.Alignment agreement:
When the motion energy of an object changes, there is inevitably some other change in energy at the same time. Alignment agreement:
Energy may take different forms (e.g. energy in fields, thermal energy, energy of motion). Alignment agreement:

Develop a model to describe that when the arrangement of objects interacting at a distance changes, different amounts of potential energy are stored in the system.
(Grades 6  8 )
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This Performance Expectation focuses on the following Three Dimensional Learning aspects of NGSS:Science & Engineering Practices Disciplinary Core Ideas Crosscutting Concepts Develop a model to describe unobservable mechanisms. Alignment agreement:
A system of objects may also contain stored (potential) energy, depending on their relative positions. Alignment agreement:
When two objects interact, each one exerts a force on the other that can cause energy to be transferred to or from the object.Alignment agreement:
Models can be used to represent systems and their interactions—such as inputs, processes and outputs—and energy and matter flows within systems. Alignment agreement:

Energy may take different forms (e.g. energy in fields, thermal energy, energy of motion).
(Grades 6  8 )
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Common Core State Standards  Math

Fluently add, subtract, multiply, and divide multidigit decimals using the standard algorithm for each operation.
(Grade 6 )
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Use variables to represent quantities in a realworld or mathematical problem, and construct simple equations and inequalities to solve problems by reasoning about the quantities.
(Grade 7 )
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Rearrange formulas to highlight a quantity of interest, using the same reasoning as in solving equations.
(Grades 9  12 )
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Solve quadratic equations by inspection (e.g., for x² = 49), taking square roots, completing the square, the quadratic formula and factoring, as appropriate to the initial form of the equation. Recognize when the quadratic formula gives complex solutions and write them as a ± bi for real numbers a and b.
(Grades 9  12 )
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More Curriculum Like This
On the topic of energy related to motion, this summary lesson ties together the concepts introduced in the previous four lessons and show how the concepts are interconnected in everyday applications. A handson activity demonstrates this idea and reinforces students' math skills in calculating energ...
This lesson introduces the concepts of momentum, elastic and inelastic collisions. Many sports and games, such as baseball and pingpong, illustrate the ideas of momentum and collisions. Students explore these concepts by bouncing assorted balls on different surfaces and calculating the momentum for...
Students examine how different balls react when colliding with different surfaces, giving plenty of opportunity for them to see the difference between elastic and inelastic collisions, learn how to calculate momentum, and understand the principle of conservation of momentum.
Unit Schedule
 Day 1: Kinetic and Potential Energy of Motion lesson
 Day 2: Swinging Pendulum activity or Swinging Pendulum (for High School) activity (depending on grade level)
 Day 3: Work and Power: Waterwheel lesson
 Day 4: Power, Work and the Waterwheel activity
 Day 5: Collisions and Momentum: Bouncing Balls lesson
 Day 6: Bouncing Balls: Collisions, Momentum & Math in Sports activity or Bouncing Balls: Collisions, Momentum & Math (for High School) activity
 Day 7: What a Drag lesson
 Day 8: Sliders activity or Sliders (for High School) activity
 Day 9: Puttin' It All Together lesson
 Day 10: Energy in Collisions: Rolling Ramp and Review activity or Energy in Collisions: Rolling Ramp and Review (for High School) activity
Contributors
See individual lessons and activities.Copyright
© 2004 by Regents of the University of ColoradoSupporting Program
Integrated Teaching and Learning Program, College of Engineering, University of Colorado BoulderAcknowledgements
The contents of this digital library curriculum were developed under grants from the Fund for the Improvement of Postsecondary Education (FIPSE), U.S. Department of Education and the National Science Foundation (GK12 grant no. 0338326). However, these contents do not necessarily represent the policies of the Department of Education or National Science Foundation, and you should not assume endorsement by the federal government.
Last modified: May 1, 2019
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