Try different sized “pencils” or tool to lift.Then ask, “What would happen if we used a different vessel? A different type of bottle?”.Record what works and what doesn’t work and thoughts on why that might be the case. Ask “What would happen if we used a different material in the bottle?” Then, try different materials like sand, pasta, etc.Why could the chopstick pick up the bottle of rice in one case but not in another? (The rice wasn’t settled enough in the bottle, around the chopstick.).Learn about Friction from Science Maxĭon’t stop at simply doing the science experiment! Ask questions that help your kids with their scientific thinking! I have a few examples for you below but if you need more ideas to check out, click thru to this post I wrote a while back: 9 Fantastic Ways to Help a Child with Science Thinking. Once this happens, the frictional force overwhelms the rice and so the rice will push against the chopstick. In fact, the grains are pushing so forcefully, they create a force that causes the chopstick to become stuck enabling you to pick up the bottle of rice. “…while two rough surfaces (such as sandpaper) rubbing against each other sometimes have more friction, very smoothly polished materials (such as plates of glass) that have been carefully cleaned of all surface particles may actually stick to each other very strongly.”Īs we push the chopstick into the bottle, the grains of rice settle close to one another eliminating most of the air pockets. I learned from LiveScience that there are exceptions to the rules of friction: Unlike other forces, friction can’t be derived from equations or laws alone. So when did we first discover this amazing force? Believe it or not, scientists began identifying and understanding the laws governing friction in the 1400s! The cool part about friction is that the interactions are so complex that in order to truly understand the concept many different types of experiments in a variety of situations (different materials, etc) have to happen. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.” (Source: LiveScience) Live Science tells us, “It is not a fundamental force, like gravity or electromagnetism. As the rice sits in the bottle, there are air pockets around most grains, which prevents friction. In this case, we had rice and a chopstick. Friction is the force that opposes the movement of one substance against another.
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