--- title: 2.PS2.1 description: 2.PS2.1 Analyze the push or the pull that occurs when objects collide or are connected. image: https://www.knowatom.com/hubfs/Right%20Image.png --- [![Teacher Login](https://no-cache.hubspot.com/cta/default/347944/f56bee57-133e-4975-8055-799f1f23588b.png)](https://cta-redirect.hubspot.com/cta/redirect/347944/f56bee57-133e-4975-8055-799f1f23588b) [Teacher Login](https://app.knowatom.com/signin) [![KnowAtom Logo](https://www.knowatom.com/hubfs/KnowAtom%20Logo.svg "KnowAtom Logo")](https://www.knowatom.com/) # 2.PS2.1 Analyze the push or the pull that occurs when objects collide or are connected. [![Download a Sample Unit](https://no-cache.hubspot.com/cta/default/347944/20eee377-e175-48fe-a039-ae723137a2a6.png)](https://cta-redirect.hubspot.com/cta/redirect/347944/20eee377-e175-48fe-a039-ae723137a2a6) Science & Engineering Practices - [Developing and using models](https://www.knowatom.com/developing-and-using-models) - [Planning and carrying out investigations](https://www.knowatom.com/planning-and-carrying-out-investigations) - [Constructing explanations and designing solutions](https://www.knowatom.com/constructing-explanations-and-designing-solutions) - [Engaging in argument from evidence](https://www.knowatom.com/engaging-in-argument-from-evidence) - [Obtaining evaluating and communicating information](https://www.knowatom.com/obtaining-evaluating-and-communicating-information) Disciplinary Core Ideas - [Weather and Climate](https://www.knowatom.com/weather-and-climate) - [Conservation of Energy and Energy Transfer](https://www.knowatom.com/conservation-of-energy-and-energy-transfer) Crosscutting Concepts - [Patterns](https://www.knowatom.com/patterns) - [Cause and Effect](https://www.knowatom.com/cause-and-effect) [![New call-to-action](https://no-cache.hubspot.com/cta/default/347944/b5a1446e-d782-4a5f-a019-0b3b98c8304f.png)](https://cta-redirect.hubspot.com/cta/redirect/347944/b5a1446e-d782-4a5f-a019-0b3b98c8304f) ## Browse 2.PS2.1 Lesson Plans Grade Ranges All K-2 3-5 6-8 [![](https://www.knowatom.com/hubfs/image1-Oct-07-2023-11-07-17-5091-AM.png) ](https://www.knowatom.com/science-phenomena-videos/2nd-grade-science/action-reaction-forces) ## [Action-Reaction Forces In the last unit, students explored how shelters help animals survive in their environment. In this unit, students investigate the relationship between forces and motion, building propeller cars to observe action-reaction forces, the relationship between the distance their car travels and the amount of force applied, and how friction affects motion.](https://www.knowatom.com/science-phenomena-videos/2nd-grade-science/action-reaction-forces) [ VIEW LESSON ](https://www.knowatom.com/science-phenomena-videos/2nd-grade-science/action-reaction-forces) [![](https://www.knowatom.com/hubfs/image2-3.png) ](https://www.knowatom.com/science-phenomena-videos/kindergarten-science/pushes-and-pulls) ## [Pushes and Pulls In the third and final unit of Kindergarten, students investigate how pushes and pulls are forces that change the motion of an object. They apply their scientific knowledge to design a solution that solves a problem.](https://www.knowatom.com/science-phenomena-videos/kindergarten-science/pushes-and-pulls) [ VIEW LESSON ](https://www.knowatom.com/science-phenomena-videos/kindergarten-science/pushes-and-pulls) [![](https://www.knowatom.com/hubfs/image3-3.png) ](https://www.knowatom.com/science-phenomena-videos/kindergarten-science/engineering-marble-movers) ## [Engineering Marble Movers In this unit, students discover that pushes and pulls are forces that change the motion of an object. They begin by exploring how objects move in different directions when they are pushed or pulled, and then investigate how changing the strength of a force changes the distance an object moves. They then use a model to see how friction affects the distance and speed with which an object moves over a surface. ](https://www.knowatom.com/science-phenomena-videos/kindergarten-science/engineering-marble-movers) [ VIEW LESSON ](https://www.knowatom.com/science-phenomena-videos/kindergarten-science/engineering-marble-movers) [![](https://www.knowatom.com/hubfs/image3-Oct-07-2023-11-18-04-1048-AM.png) ](https://www.knowatom.com/science-phenomena-videos/2nd-grade-science/engineering-boats) ## [Engineering Boats In this unit, students investigate what makes an object float or sink, exploring the science phenomena of properties of objects that float and sink. This page is a high-level extract of the last lesson in 2nd grade that has students applying their knowledge about the relationship between an object’s properties and its ability to float.](https://www.knowatom.com/science-phenomena-videos/2nd-grade-science/engineering-boats) [ VIEW LESSON ](https://www.knowatom.com/science-phenomena-videos/2nd-grade-science/engineering-boats) Standards citation: NGSS Lead States. 2013. *Next Generation Science Standards: For States, By State*s. Washington, DC: The National Academies Press. 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