Astronauts appear weightless in space because:
Correct answer: C. Satellite is freely falling
- A. There is no gravity in space
- B. There is no floor pushing upwards on them
- C. Satellite is freely falling
- D. There is no air in space
Explanation
Astronauts aboard the International Space Station (ISS) or other spacecraft are in a state of constant free fall around the Earth. The spacecraft and its occupants are falling towards the Earth due to the force of gravity, but they are moving horizontally at such a high speed that they continuously miss the Earth. This continuous free fall creates the sensation of weightlessness.
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About Simple Harmonic Motion
Simple harmonic motion is oscillation in which acceleration is directly proportional to displacement and directed toward the equilibrium position. Work includes displacement, velocity, acceleration, phase, period, frequency, amplitude and energy, with applications to springs and simple pendulums. The restoring force and the conditions for SHM distinguish it from general periodic motion.
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