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Q&A:
Question by redtulipbug: I need to relate Newtons first law to Newtons third law?
I have several fourth graders. I want to use hula hoops to show “an object in motion stays in motion”. I want to use “squeeze bottle” rockets to show “for every actions there is an equal and opposite reaction”. My problem is how to connect the two ideas. I am not in charge of Newtons second law.
Other details: squeeze bottle rockets use air pressure to shoot straws across the room.
The basic ideas that I am teaching are “how force is affected by direction” and “how the direction of a force affects motion”.
Best answer:
Answer by poseiden_is_back
I’m not exactly sure how the squeeze bottle rocket works, but I’m assuming you squeeze the bottle and the rocket shoots. This might be over the head of 4th graders, but since the energy you put into squeezing the bottle results in linear motion of the rocket, the opposing force is air resistance and friction, however you don’t see an obvious opposite reaction, just a dissipation of energy, a better way to demonstrate this would be to crash it into some type of spring, while explaining that it is a simplification of what really happens.
You can say an object in motion tends to stay in motion until opposing forces act to either repell the motion (bounce) or absorb the energy used to cause the motion into itself. This is why cars crumple in crashes, they’re designed to absorb the forward momentum (read object in motion) and dissipate the energy instead of transferring it to the passengers.
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