Section 3

Name
Class
Date
_
Chapter 8 Motion and Forces
Section 8.3 Newton’s Laws of Motion
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Pacing
Regular Schedule: with lab(s): 2 days
Block Schedule: with lab(s): 1 day
without lab(s): 2 days
without lab(s): 1 day
Objectives
1. State Newton’s three laws of motion, and apply them to physical situations.
2. Calculate force, mass, and acceleration with Newton’s second law.
3. Recognize that the free-fall acceleration near Earth’s surface is independent of the
mass of the falling object.
4. Explain the difference between mass and weight.
5. Identify paired forces on interacting objects.
National Science Education Standards Covered
PS 4a: Objects change their motion only when a net force is applied. Laws of
motion are used to calculate precisely the effects of forces on the motion of
objects. The magnitude of the change in motion can be calculated using the
relationship F = ma, which is independent of the nature of the force. Whenever
one object exerts force on another, a force equal in magnitude and opposite in
direction is exerted on the first object.
UCP 2: Evidence, models, and explanation
Block 5
Focus 10 minutes
Focus Transparency LT 28 Forces and Motion. Students fill out a
worksheet tapping their prior knowledge and experience with Newton’s laws
prior to reading and discussing the chapter.
Motivate 10 minutes
Lab
Quick Activity: Newton’s First Law, p. 269. This is a quick
demonstration of inertia using a glass, a coin, and an index card. Students can use
Datasheet 8.1 to record their data.
Teach 25 minutes
Demonstration: Math Skills, p. 270. Demonstrate how to solve F = ma
problems using the Math Skills example problem.
Demonstration and Guided Practice: Assign Math Skills problems 1–3 on
page 270 as guided practice. Allow students time to solve problems on their own.
Then work the problems as a group and explain the steps as you proceed.
Holt Science Spectrum: A Physical Approach
Copyright  by Holt, Rinehart and Winston. All rights reserved.
Chapter 8 Lesson Plan p. 7
Demonstration and Guided Practice: Additional Examples: Newton’s
Second Law, ATE p. 270. Write the additional examples on the board or make an
overhead using Additional Examples: Newton’s Second Law. Give the
students a few minutes to solve the problems themselves, then work the problems
as a group.
Homework
Math Skills Worksheet 16: Newton’s Second Law. Students will practice
solving problems with all rearrangements of Newton’s second law.
Block 6
Teach 30 minutes
Demonstration: Integrating Space Science, p. 272. Demonstrate the
relationship between weight and mass using the problems on p. 272. Work the
“Earth” example on the board. Then have three volunteers from the class work
the other three examples on the board. The rest of the class can work the
problems at their seats. Additional questions and problems are found in
Integration Enrichment Worksheet 8.5: Integrating Space Science—
Gravity and the Planets.
Teaching Transparency TT 23 Terminal Velocity. Use this transparency to
illustrate balanced forces.
Lab
Inquiry Lab: How are action and reaction forces related? p. 273. Students
investigate action and reaction forces in an inquiry-based lab. Datasheet 8.2
accompanies this lab. (10 minutes)
Extend 10 minutes
Integration Enrichment Worksheet 8.6: Integrating Biology—How Fish
Maintain Neutral Buoyancy. Students explore a biological example of Newton’s
laws of motion.
Close 5 minutes
Section Review: p. 274, items 1–6. These items will reinforce the material
covered in Section 8.3.
Chapter Review: p. 275, items 4, 6–8, 11, 12, and 22–25. These items will
reinforce the material covered in Section 8.3.
Homework
Complete the review exercises that were assigned during the Close.
Other Resource Options
CNN Presents Science in the News: Physical Science: Segment 6 Egg
Drop Contest. Students examine a short video about an egg drop contest.
(10 minutes)
Holt Science Spectrum: A Physical Approach
Copyright  by Holt, Rinehart and Winston. All rights reserved.
Chapter 8 Lesson Plan p. 8
Science in the News: Physical Science Critical Thinking
Worksheet 6. This critical thinking worksheet accompanies CNN video
segment 6, Egg Drop Contest. (10 minutes)
CNN Presents Science in the News: Physical Science: Segment 7
Zero-Gravity Plane. A short video about experiencing zero gravity in a plane.
(10 minutes)
Science in the News: Physical Science Critical Thinking
Worksheet 7. This critical thinking worksheet accompanies CNN video
segment 7, Zero-Gravity Plane. (10 minutes)
Guided Reading Audio CD Program: Script for Section 8.3. The audio
reading of the chapter covers essential chapter content for ESL students, auditory
learners, and struggling readers. (25 minutes)
Integration Enrichment Worksheet 8.7: Connection to the Fine Arts—
Momentum of Line in Art. Students explore how visual artists convey the
concept of motion and momentum. (10 minutes)
Integration Enrichment Worksheet 8.8: Integrating Technology—
Hydraulic Lift Force. Students are exposed to a real-life application of force:
hydraulics. (10 minutes)
Lab
Design Your Own Lab: Testing the Strength of a Human Hair, p. 278.
Students gain lab experience testing the force needed to break a human hair. Hand
out Datasheet 8.3. (45 minutes)
NSTA sciLINKS: Graphing, speed, velocity, acceleration, sciLINKS
keyword: HK1085. Students research Internet sources related to friction.
(Enrichment)
Spanish Guided Reading Audio CD Program: Script for Section 8.3.
Spanish audio reading of the chapter covers essential chapter content for native
Spanish-speaking students. (25 minutes)
Study Guide: Section 8.3. Students will review key concepts in the section.
(30 minutes)
Holt Science Spectrum: A Physical Approach
Copyright  by Holt, Rinehart and Winston. All rights reserved.
Chapter 8 Lesson Plan p. 9

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