Newton's three laws of motion form the foundation of classical mechanics and explain how objects move and interact with forces. These laws were formul
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Why do passengers lurch forward when a bus brakes suddenly?
Passengers have inertia from the bus's motion. When the bus brakes, the passenger's body wants to continue moving forward by Newton's first law. Without a seatbelt or support, the passenger slides forward until hitting something that stops them.
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If the third law says action and reaction are equal, why do moving objects change speed?
The action and reaction forces are equal and opposite, but they act on different objects. When you push a ball, the ball pushes back on your hand equally, but only the force on the ball causes it to accelerate.
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Does a heavier object fall faster than a lighter one?
No, both fall with the same acceleration of 10 m/s squared (ignoring air resistance) because gravitational force is proportional to mass. F = mg and a = F/m = g, so acceleration is independent of mass.
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