CHALKBOARD WORKBOOKS Instant STEM Activities Workbooks • Gr. 1-6 These STEM workbooks feature activities, projects, and experiments that provide a balance of core knowledge learning and investigation and application. They also address the three dimensions of science learning outlined in the Next Generation Science Standards: disciplinary core ideas, science and engineering practices, and crosscutting concepts. The focus is on concepts and skills from physical, life, and Earth and space sciences, and on familiarizing students with science, technology, engineering, and math (STEM) concepts. Assessment rubrics for success criteria are also included. © Chalkboard Publishing31“The Force of Friction”—Think About It! Use the examples below to answer questions 1 and 2. • You roll a marble on a towel. • You roll a marble on a glass table. 1. In which example is more friction created? ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ 2. Tell why you think your answer to question 1 is correct. ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ 3. Imagine you rub together two pieces of regular paper. Then you rub two pieces of sandpaper. When is there more friction? Tell how you know. ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ 4. Cars go faster on a paved road than on a gravel road. How can friction explain this? ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ 120 pg. books/$15.99 each Includes: • Physical, Life, Earth, and Space Sciences • Engineering, Technology, and Applications of Science • Informational Text • Project-Based Activities • STEM Occupations CTP 8195 Grade 3 DESIGNED for TEACHERS with PARENTS IN MIND! © Chalkboard Publishing30The Force of FrictionWhat Is Friction? Friction is a force. Friction is created when things rub against each other. What does friction do? Friction slows objects down. Imagine you push a box across a smooth fl oor. The box moves, then stops. The box and the fl oor rub against each other. There is friction between the fl oor and the box. Friction works against movement. Friction makes moving objects slow down. Smooth and Rough SurfacesWhen objects rub against each other, their surfaces touch. Rough surfaces create more friction than smooth surfaces. Imagine pushing a toy car across a hard fl oor. Now imagine pushing the car on carpet. The car slows down on both fl oors, then stops. On which fl oor will the car go farther? Why? The carpet has a rougher surface than a hard fl oor has. The carpet creates more friction. When there is more friction, an object slows down more quickly. Surfaces Rubbing TogetherWhat happens when different surfaces rub against each other? Does the amount of friction change? What Rubs Together?How Much Friction? A rough surface rubs on a rough surfaceA lot of frictionA rough surface rubs on a smooth surfaceMedium frictionA smooth surface rubs on a smooth surfaceVery little frictionrough surfacesmooth surface © Chalkboard Publishing33“How Friction Helps Us”—Think About It! 1. Think about going down stairs wearing socks on your feet. Now think about going down stairs wearing athletic shoes. Which example is more dangerous? Tell why. ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ 2. In winter, some cars have snow tires. Snow tires help people drive in snow. Snow tires also help cars stop faster. In summer, cars have regular tires. Which tires have a rougher surface: snow tires or regular tires? Why do you think so? ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ 3. People do not leave snow tires on cars all year. When spring comes, people put regular tires back on. Why do people not leave snow tires on all year? (Hint: Think about friction and what it does.) ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ ____________________________________________________________________ © Chalkboard Publishing32How Friction Helps UsHow does friction help us in daily life? Friction stops us from slipping. Slippery IceThere can be lots of ice on sidewalks in winter. Ice is very smooth, so ice is easy to slip and hurt yourself on. Why? A smooth surface rubbing against a smooth surface creates very little friction. Winter boots help us from slipping on ice. Why? A rough surface rubbing against a smooth surface creates medium friction. Winter boots have rough soles that create friction. Friction slows or stops movement. Thus, the rough soles on boots stop us from slipping on ice. Sometimes people put sand on ice. Sand makes the ice surface rough. It is harder to slip on sandy ice. The sand creates friction between the ice and your boots. Slippery StairsSlipping on stairs is very dangerous. You could hurt yourself badly if you fall down the stairs. Stairs are often made of smooth wood. When shoes rub against smooth wood, there might not be enough friction. The shoes might slip off the step. Socks are even worse. Carpet can add friction to stairs. Rough strips of material work, too. The added friction stops people from slipping. winter bootswood stairs STEM Activity Books CTP 8193 Grade 1 CTP 8194 Grade 2 CTP 8195 Grade 3 CTP 8196 Grade 4 CTP 8197 Grade 5 CTP 8198 Grade 6 Creative Teaching Press® 92 To see our complete product line, eBooks, and free activities visit
Magnified View - Please use mouse to move page for easier readability