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What's the BIG IDEA?
What's the BIG IDEA?
AN OBJECT THAT IS CHANGING ITS MOTION -- THAT IS ACCELERATING -- MUST BE EXPERIENCING AN EXTERNAL NET FORCE IN THE DIRECTION OF THE ACCELERATION.
AN OBJECT THAT IS CHANGING ITS MOTION -- THAT IS ACCELERATING -- MUST BE EXPERIENCING AN EXTERNAL NET FORCE IN THE DIRECTION OF THE ACCELERATION.
Objects around us speed up and slow down and change their direction all the time. The only way they can do this is by receiving a force from the outside that is not balanced by other forces.
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