These activities are a nice addition to a study of forces and motion. In the first one, students use BBs and pullback cars to demonstrate how when the car goes forward, it's pushing backward on the ground.
In the second, students use rubber bands to demonstrate and measure equal and opposite forces. Extension ideas are provided for digging deeper to help solidify the concept for students. Most students have the sense that only people can exert a force such as a push--and don't realize that walls, tables, the ground, etc can push things too. This surprising fact is fundamental to understanding Newton's third law.
these experiments is part of the unit bundle sold in my shop: Force, Motion, & Energy Bundle—Video and Written Instructions
• Forces always come in pairs.
• force pairs are always equal in degree and opposite in direction.
meter sticks, identical rubber bands, string
Extensive teacher notes address the many questions that come up. You shouldn’t have to do outside research on this topic unless you want to.
Each lab takes about 30 mins but can take longer with included extensions and writing assignments.
• Scaffolded writing prompts &
Click here to see companion curricular pieces:
Activities on Motion (Newton's Laws)
Click here to see a Complete Unit Bundle on Force and Motion:
Force, Motion, & Energy Bundle—Video and Written Instructions
Developing and Using Models
Virginia VA SOL
PS.10 b, c
Grade 6: 8A
Grade 8: 6C
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