Newton's laws of motion
Newton's third law says that whenever one object pushes or pulls on a second object, the second object pushes or pulls back on the first with an equal amount of force in the opposite direction, a car crashing into a wall pushes on the wall exactly as hard as the wall pushes back on the car. Since that reaction force can't be avoided, engineers instead design ways to make it less harmful, like a car's crumple zone, which stretches out the length of time a collision takes, lowering the force passengers actually feel even though the total forces on the car and the wall stay equal and opposite.
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This final covers a lot of topics, so it's split into 2 parts. Each part includes a question from every one of its topics.
Final, Part 1 of 2
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