If you hold a heavy rock (say 300 lbs) in outer space without any gravity, would it still be very heavy or would it be very light?


 In outer space, without gravity, the rock would not feel "heavy" because weight depends on gravity. The 300 lbs you mention refers to the rock's weight on Earth, where gravity pulls on it, creating that force. Without gravity in space, the rock would have no weight. 


However, the rock still has mass, which means it would still resist any changes in motion. If you tried to push or move it, you'd feel the inertia of its mass, so while it wouldn't be "heavy," it would still require force to move, and it could still be difficult to accelerate. In short, in space, it would feel "weightless" but still have mass that resists movement.

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