UNIVERSE
SPACE EXPLORATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the force that holds objects (like a spacecraft) to the Earth’s surface?
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Vaccuum
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Acceleration
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Mass
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Gravity
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Explanation:
Detailed explanation-1: -The answer is gravity: an invisible force that pulls objects toward each other. Earth’s gravity is what keeps you on the ground and what makes things fall. An animation of gravity at work.
Detailed explanation-2: -The average gravitational pull of the Earth is 9.8 meters per second squared (m/s2).
Detailed explanation-3: -The gravitational pull by the earth is equal to the weight of the object.
Detailed explanation-4: -In the context of a rotating space station, it is the radial force provided by the spacecraft’s hull that acts as centripetal force. Thus, the “gravity” force felt by an object is the centrifugal force perceived in the rotating frame of reference as pointing “downwards” towards the hull.
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