# Chapter 8_ Work and Machines

Document Sample

```					Name                       Class              Date           _

Chapter 8: Work and Machines
Lesson Plan
Section 1: Work and Power
________________________________________________________________________

Pacing
1 Block = 45 minutes
Regular Schedule:    with Lab(s): 3 Days             without Lab(s): 2 Days
Block Schedule:      with Lab(s): 1 1/2 Days               without Lab(s): 1 Day

Objectives
1. Determine when work is being done on an object.
2. Calculate the amount of work done on an object.
3. Explain the difference between work and power.

Standards Covered
Unifying Concepts and Processes (UCP)
3. Change, constancy, and measurement

Science as Inquiry (SAI)
1. Abilities necessary to do scientific inquiry

Science and Technology (ST)
2. Understandings about science and technology

History and Nature of Science (HNS)
3. History of Science

Block 1
Focus 5 minutes
Bellringer, ATE p. 188. On the board, give students the following task: Select
the activities below that require the least amount of work. Write your answers in
carrying heavy books home
skiing for 1 hour
lifting a 45 kg mass
holding a steel beam in place for 3 hours
jacking up a car

Holt Science & Technology: Physical Science                  Chapter 8 Lesson Plans   1
Remind students to explain what work is being done in each situation.

Motivate 5 minutes
Discussion, ATE p. 188. Discuss with students the use of the words work and
power in everyday language. Identify uses that do not match the scientific
definition of work, and discuss why they are different. Remind students that work
is discussed in this section in terms of physically moving objects, not in terms of
energy expenditure.

Teach 30 minutes
section, ask them whether they agree with the following statements:
1. Any time a force is applied to an object, work is being done.
2. Power, work, and force are the same.
3. More power means doing work faster.

Teaching Transparency 229, “Work or Not Work?” Use this transparency to
illustrate four activities, and describe them in terms of direction of force and
direction of motion.

Teaching Transparency 230, “Work Depends on Force and Distance.” This
transparency explains the equation for work by using the example of someone
lifting a barbell.

MathBreak, “Working It Out,” p. 190. Ask students to practice two work-
equation problems. These items support STANDARD UCP 3.

Block 2
Extend 30 minutes
Directed Reading Worksheet 8, Section 1. This worksheet focuses
students’ attention on the critical information in the section.

QuickLab, “More Power to You,” p. 191. This activity gives students further
practice in calculating work and power, and it emphasizes the difference between
the two concepts. This lab supports STANDARDS UCP 3 and SAI 1.

Close 15 minutes
Quiz, ATE p. 191. Students demonstrate knowledge of STANDARD UCP 3

Alternative Assessment, “Concept Mapping,” ATE p. 191. Have students
create a concept map using the scientific definitions of the words work and power.

Holt Science & Technology: Physical Science                   Chapter 8 Lesson Plans   2
Block 3
Lab Day 45 minutes
Discovery Lab, “A Powerful Workout,” p. 662. In this lab, students calculate
the work and power involved in climbing a flight of stairs at different speeds.

Datasheets for LabBook, Datasheet 27, “A Powerful Workout.” This
blackline master makes progressing through the lab easier for students and

Inquiry Labs, “Get an Arm and an Egg Up,” Lab 19. Students work in teams to
design and construct a hydraulic arm that will lift an egg, move it to one side, and
lower it.

Math and More, ATE p. 190. Groups of students select a sport, discuss different
ways work is done in that sport, and estimate how much work is done in an
average game.

Review, p. 191. Evaluate students’ mastery of STANDARDS UCP 3 and SAI 1

Science Puzzlers, Twisters & Teasers, Worksheet 8. These worksheets offer
puzzles, games, and logic problems that use vocabulary and concepts from the
chapter.

Holt Anthology of Science Fiction, “Clean Up Your Room!” by Laura Anne
Gilman, p. 198. A young computer programmer writes a computer program to
manage her household affairs, but her plan goes strangely awry.

Holt Anthology of Science Fiction, Think About It! “Clean Up Your
Room!” These questions encourage students to really think about what they’ve

Math Skills for Science Worksheet 51, “Work and Power.” This worksheet
gives students practice calculating work and power in real-life applications.

Physical Science Guided Reading Audio CD Program, Disc 8, Tracks 1–2.
The audio reading of the chapter provides essential chapter content for ESL
students, auditory learners, and struggling readers.

research Internet resources related to work and power.

Holt Science & Technology: Physical Science                   Chapter 8 Lesson Plans   3
CNN Presents Science in the News: Multicultural Connections,
Segment 7, “Who Built the Egyptian Pyramids?” Students view a video segment
about the building techniques and lifestyles of the people who built the Egyptian
pyramids.

CNN Presents Science in the News: Multicultural Connections Worksheet 7,
“Who Built the Egyptian Pyramids?” This worksheet reinforces  concepts from CNN
Presents Science in the News Multicultural Connections, video Segment 7.

CNN Presents Science in the News: Science, Technology & Society,
Segment 13, “Snake Robots.” Students view a video segment about robots that
are designed to mimic the movements of snakes by using many motorized joints.
This technology has many uses, including finding trapped people in collapsed
buildings, retrieving samples from toxic waste dumps, and retrieving satellites in
space.

CNN Presents Science in the News: Science, Technology & Society,
Worksheet 13, “Snake Robots.” This worksheet reinforces concepts from CNN
Presents Science in the News: Science, Technology & Society, video Segment 13.

go.hrw.com For worksheets and other teaching aids related to this chapter,
visit the HRW Web site and type in the keyword: HSTWRK

Holt Science & Technology: Physical Science                  Chapter 8 Lesson Plans   4

```
DOCUMENT INFO
Shared By:
Categories:
Stats:
 views: 252 posted: 5/28/2010 language: English pages: 4