# ALEX Lesson Plan

## Gravity on Earth

You may save this lesson plan to your hard drive as an html file by selecting "File", then "Save As" from your browser's pull down menu. The file name extension must be .html.

This lesson provided by:
 Author: Jackie Smith System: Madison City School: Mill Creek Elementary School The event this resource created for: ASTA
General Lesson Information
 Lesson Plan ID: 34426 Title: Gravity on Earth Overview/Annotation: In this lesson, students will share their background knowledge of gravity and how it affects skydivers. After a brief whole group discussion on gravity, students will work in small groups to explain why the International Space Station does not fall to Earth. Finally, students will create a model helicopter to provide evidence that the gravitational force of earth will cause the helicopter to fall downward toward the center of Earth.This lesson results from a collaboration between the Alabama State Department of Education and ASTA.
Associated Standards and Objectives
Content Standard(s):
 Science SC2015 (2015) Grade: 5 6 ) Construct an explanation from evidence to illustrate that the gravitational force exerted by Earth on objects is directed downward towards the center of Earth. Unpacked Content Scientific And Engineering Practices:Constructing Explanations and Designing SolutionsCrosscutting Concepts: Cause and EffectDisciplinary Core Idea: Motion and Stability: Forces and InteractionsEvidence Of Student Attainment:Students: Support an explanation with evidence that the gravitational force exerted by Earth on objects is directed down.Teacher Vocabulary:construct explanation gravitational force evidence illustrate sphericalKnowledge:Students know: The Earth's shape is spherical. That objects dropped appear to fall straight down. That people live all around the spherical Earth, and they all observe that objects appear to fall straight down.Skills:Students are able to: Construct an explanation of observed relationships. Use evidence to illustrate the relationship between gravity and objects on Earth.Understanding:Students understand that: If Earth is spherical, and all observers see objects near them falling directly "down" to the Earth's surface, then all observers would agree that objects fall toward the Earth's center. Since an object that is initially stationary when held moves downward when it is released, there must be a force (gravity) acting on the object that pulls the object toward the center of the Earth.AMSTI Resources:AMSTI Module: Earth: Gravity and Space Alabama Alternate Achievement Standards AAS Standard: SCI.AAS.5.6- Identify examples of objects being affected by Earth's downward gravitational force.

Local/National Standards:

Primary Learning Objective(s):

Students will construct an explanation from evidence to illustrate that the gravitational force exerted by Earth on objects is directed downward towards the center of Earth.

Preparation Information
 Total Duration: 61 to 90 Minutes Materials and Resources: For each student:helicopter template,scissors,review questions,pencils,sceince journals, andtape Technology Resources Needed: Computer with internet access Projector Background/Preparation: The teacher should preview the gravity slideshow prior to the lesson.
Procedures/Activities:
 Engage: Show skydiving video (3:05). Begin a whole group discussion to activate background knowledge on gravity and how it affects the skydivers in the video. Next, students will turn and talk to their groups to discuss why the gravitational pull of earth does not cause the International Space Station to fall out the sky, but it does cause the skydiver to fall to earth. Students will record their answers in their science journals. Explore: Students will use the helicopter template  found on slide 4 of the slideshow to create a model helicopter that can be used to demonstrate how the gravitational pull of the Earth affects objects. A PDF file of the helicopter template can be found here. Students will create the helicopters from the template and drop them from a height of 3 feet. In their science journals, the students will record their observations of what happens to the helicopter as it is released.  Elaborate Using the template, each group of students will create 2 additional helicopters. All 3 helicopters will be dropped at the same time. One from a height of  3 feet, one from 4 feet, and one from 5 feet. Students will time the descent of the helicopters and record the data in their science journals. Repeat 5 times. Students will use data from this activity to construct an explanation to support their claim that the gravitational force exerted by Earth on objects is directed downward towards the center of Earth.
Assessment
 Assessment Strategies Evaluate:Review Questions see slide #5Teacher observation of science journals - students should be able to explain the following: the International Space Station is a long distance away from Earth and the gravitational pull of our planet is not strong enough to pull it down to Earth. Since the skydivers are much closer to Earth, the gravitational pull causes them to fall to Earth.Teacher observation of helicopter model design, construction, and testing.CER: Students will make a claim regarding how the gravitational force of Earth affects objects and use data from their helicopter activity to support that claim. They will conclude this assessment with an explanation or reasoning for their claim.

Acceleration:

Intervention:

 ELL: The student handouts could be translated into the native language of the student. The ELL teacher can also provide assistance to students.Students with disabilities: Students can work with a peer helper or with the pull-out teacher.

 View the Special Education resources for instructional guidance in providing modifications and adaptations for students with significant cognitive disabilities who qualify for the Alabama Alternate Assessment.