GK
PHYSICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
True
|
|
|
False
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -The moon moves around earth with a velocity that is constant in magnitude yet it is a free fall under gravity because it is falling constantly but it is missing the earth. It is also a periodic motion because the moon is going around earth in a fixed orbit.
Detailed explanation-2: -Earth is in free fall, but the pull of the Moon is not the same at Earth’s surface as at its centre; the rise and fall of ocean tides occur because the oceans are not in perfect free fall.
Detailed explanation-3: -So the moon “falls” toward Earth due to gravity, but doesn’t get any closer to Earth because its motion is an orbit, and the dynamics of the orbit are determined by the strength of gravity at that distance and by Newton’s laws of motion.
Detailed explanation-4: -It’s trying to continue straight on out into the galaxy. Gravity curves the moon’s path just enough to match the curve of the Earth. So the moon doesn’t fall to Earth. It falls around the Earth. The moon is always falling, but it never falls down!
Detailed explanation-5: -A spacecraft in continuous orbit. The free fall would end once the propulsion devices turned on. An stone dropped down an empty well. An object, in projectile motion, on its descent. 05-Nov-2020