From the physics of g-force to weightlessness: How it feels to launch into space
Briefly

For every action there is an equal and opposite reaction. As the rocket's exhaust pushes downward, it creates an upward force, allowing the rocket to shoot skyward, following Isaac Newton's third law of motion.
Rockets must move fast to overcome the curvature of spacetime created by the Earth's mass. Earth's gravity is explained as part of spacetime curving inward, making escape difficult, illustrating gravitational force.
Read at www.npr.org
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