What is the net force when pulls go against each other?
You said a 100 N pull right and a 40 N pull left give 140 N. They fight: the net force is the difference, 60 N, and it points the stronger way.
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Why does your head jerk forward when the bus stops?
You said a moving ball slows down in space without a push. Nothing pushes or pulls it there, so Newton's first law says it keeps going.
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