Where is Newton's 3rd Law on Roller Coaster

Newton’s 3rd Law of Motion states that for every action, there is an equal and opposite reaction. On a roller coaster, this action-reaction principle happens continuously between the riders, the train, the track, and the support structure.

1. Between You and Your Seat (G-Forces and Bumps)

The Action: As the roller coaster moves through high-speed turns, drops, or loops, your body’s inertia pushes downward or sideways against the seat. 

The Reaction: The seat pushes back against your body with an equal and opposite force. This upward or lateral push from the seat is what you feel as your "apparent weight" or g-force. On a bumpy track, every time you bump down into the seat, the seat hits you back with that exact same force. 

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2. Between the Wheels and the Track

The Action: The weight and motion of the roller coaster cars push down and sideways against the steel or wooden track.

The Reaction: The track exerts an equal and opposite normal force back up and inward against the wheels. This upward and sideways push from the track keeps the train locked in place and guides it safely through curves and loops instead of flying off in a straight line. 

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3. Between the Track and the Support Columns

The Action: The forces generated by the speeding train pushing onto the track are transmitted downward through the rails and into the steel or concrete support columns. 

The Reaction: The columns and the ground push right back with an equal and opposite structural resistance to keep the whole ride from collapsing under the dynamic load. 

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4. The Lift Hill Mechanism

The Action: The chain or cable lift mechanism pulls the roller coaster train upward.

The Reaction: The train exerts an equal and opposite downward/backward pull on the chain as it climbs. 

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