In a car, that force comes from the engine. So, if we need a force-a push or a pull-what’s going to provide that force? If you’re riding a bicycle or tricycle, that force comes from your muscles, as your legs push on the pedals. And if you’ve discussed energy, you can remind students that getting something moving is going to require some energy. If you’ve done lessons on force and motion, then students should know that starting something moving requires a force. Ask: If your toy car is going to start moving, what does it need to have? Depending on the grade level, you might get different answers for this question, like a push or a pull, a force, or, at the higher levels, energy. Here’s an engineering question or problem or challenge: Can we build a car that will move (at least a little bit) by itself, without being pushed? To answer this question- or any engineering question-we need to start with some science. How can I build a bridge strong enough to support cars and trucks? How can I make a wireless phone? How can I make a more powerful microscope? To answer questions like these, the engineer needs to use a lot of science. Why is the sky blue? What are stars? How do birds fly? Engineers try to solve real-world problems. Scientists try to understand how things work in the universe and why things are the way they are. But first, let’s take a quick look at the difference between science and engineering. A: Most definitely! Let’s design and build something, and then we’ll use it to explore some science.
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