经典科普资源 · 这就是物理
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FORCE AND MOTION Systems check! Ready for blast off. Hey! I'm Motion! 3, 2, 1... Hey?! What's the big idea? Huh? Sorry! I wasn't paying attention.
Come on! We're a team here! Objects don't just start moving on their own. You're right! You need me! I'm Force! And together- We're force and motion!
WHAT IS A FORCE? A force is a push or a pull. It can be as small as a nudge or as big as a shove. When I kick this ball... That's where I come in. AHHH!
A mechanical force acts when two objects touch each other. My foot touched the ball. But some forces affect objects without physically touching them. These forces are invisible. One such force is gravity. Hi. Gravity is the force that pulls everything... ...down to the ground! We get it.
FORCES ALL AROUND US There are many forces around you every day. Look at this bulldozer! That's a mechanical force at work. That's a lot of force!
