# ALEX Lesson Plan

## Optimal Snow Sled Experience

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This lesson provided by:
 Author: Megan Nichols System: Chickasaw City School: Chickasaw City Elementary School
General Lesson Information
 Lesson Plan ID: 35513 Title: Optimal Snow Sled Experience Overview/Annotation: Students will determine the difference between balanced and unbalanced forces through an experiment. The experiment consists of a student-created scaled snow sled model going down a teacher-created ramp. Students will plan to change one variable, collect data, and chart the data graphically. Students will change a variable such as: number of students riding the snow sled, size of the child (children) riding the snow sled, direction, position on the hill the snow sled is released, position of children on the sled (sitting, standing, laying), friction caused by materials that makes up the sled, and air resistance caused by an object such as a parachute. Students will collect and chart data of each experiment graphically in order to determine the longest snow sled ride.This lesson results from the ALEX Resource Gap Project.
Associated Standards and Objectives
Content Standard(s):
 Science SC2015 (2015) Grade: 3 1 ) Plan and carry out an experiment to determine the effects of balanced and unbalanced forces on the motion of an object using one variable at a time, including number, size, direction, speed, position, friction, or air resistance (e.g., balanced forces pushing from both sides on an object, such as a box, producing no motion; unbalanced force on one side of an object, such as a ball, producing motion), and communicate these findings graphically. NAEP Framework NAEP Statement:: P4.13: An object is in motion when its position is changing. The speed of an object is defined by how far it travels divided by the amount of time it took to travel that far. NAEP Statement:: P4.14: The motion of objects can be changed by pushing or pulling. The size of the change is related to the size of the force (push or pull) and the weight (mass) of the object on which the force is exerted. When an object does not move in response to a push or a pull, it is because another push or pull (friction) is being applied by the environment. Unpacked Content Scientific And Engineering Practices:Planning and Carrying out InvestigationsCrosscutting Concepts: Cause and EffectDisciplinary Core Idea: Motion and Stability: Forces and InteractionsEvidence Of Student Attainment:Students: Planned an experiment to determine the effects of balanced and unbalanced forces on the motion of an object using one variable at a time. Carried out an experiment to determine the effects of balanced and unbalanced forces on the motion of an object using one variable at a time. Collected data from experiment to serve as the basis of evidence for how balanced and unbalanced forces on an object determines an object's motion. Communicated evidence and findings from experiment graphically.Teacher Vocabulary:Experiment Variable Motion Force (push and pull) Balanced forces Unbalanced forces Cause and effect Number Size Direction Position Friction Air resistance Communicate Graphically Net force SumKnowledge:Students know: Each force acts on one particular object and has both strength and direction. An object at rest typically has multiple forces acting on it, but they add to give zero net force on the object. Forces that do not sum to zero can cause changes in the object's speed or direction of motion. Objects in contact exert forces on each other.Skills:Students are able to: Collaboratively plan an experiment to determine the effects of balanced and unbalanced forces on the motion of an object using one variable at a time. Carry out an experiment to determine the effects of balanced and unbalanced forces on the motion of an object using one variable at a time. Collect and record data from experiment. Describe how the investigation plan addresses the purpose of the investigation. Communicate findings graphically.Understanding:Students understand that: Cause and effect relationships provide evidence when investigating balanced and unbalanced forces.AMSTI Resources:AMSTI Module: Forces and Investigations Alabama Alternate Achievement Standards AAS Standard: SCI.AAS.3.1- Identify the effect of a force (e.g., push, pull, gravity) applied to an object.

Local/National Standards:

Primary Learning Objective(s):

• Students will use their knowledge of balanced and unbalanced forces to claim or hypothesize how a scaled model can be created to achieve the longest snow sled ride and document the hypothesis in their journal.
• Students will use their knowledge of balanced and unbalanced forces to communicate and document evidence to support the claim about the design of their sled.
• Students will create a snow sled to determine the effects of balanced and unbalanced forces on the motion of an object using one variable at a time.
• Students will use documentation and data collected to present findings on a chart or multimedia tool.