8th Grade Science Guide

8.2: Physics 3 Dimensions & Progressions

Unit 1

● I can defne mass, speed and kinetic and potential energy. ● I can describe, develop a model, and graph the kinetic energy of two objects of different mass

● Speed and mass affect the amount of kinetic energy an object has. Students are shown video or data of stopping distances for different sizes of vehicles. Now students should be able to answer the following questions using the ideas of mass, speed, potential, and kinetic energy. damage in a crash, a semi truck or a smart car? ● Why is it hard to stop a train? Stopping a truck vs a semi truck: Different vehicles have different stopping distances. Why? ● Which would do more drop a ball from different heights. The height a ball is dropped from determines the height it will bounce back up. Have students ask questions or make explanations. Then pose the following question to prepare for activity 2. How does the height of the hill on a roller coaster affect the cart speed? ● Option 2: Stacked ball demo. You can fnd a video of this in the materials below and a set What are the variables that affect how long it takes a car to stop? ● Option 1: Teacher will

● https://youtu.be/ruR8TTr ksbU ● https://youtu.be/KGkKDa Yd3Mo

moving (relationship: kinetic energy & mass).

8.2.2 Phenomena: Ball Bounce

Objective

Overview

Materials

● I can ask questions about the amount of potential energy related to distance. ● I can develop and conduct an investigation to measure the potential energy of an object that falls/rolls from many different heights (think of elastic potential energy).

● Option 1: a ball to bounce ● Option 2 video ● Option 2 directions