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pav-90 [236]
3 years ago
9

Which of Newton's laws explains why satellites need very little fuel to stay in oribit?

Physics
1 answer:
Angelina_Jolie [31]3 years ago
4 0

Sattelites don't need any fuel to stay in orbit. The applicable law is...."objects in motion tend to stay in motion". Having reached orbital velocity, any such object is essentially "falling" around the earth. Since there is no (or at least very little) friction in the vacuum of space, the object does not slow.... It simply continues.


Sattelites in "low" earth orbit do encounter some friction from the very thin upper atmosphere, and they will eventually "decay".

:)

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A 10.3 kg block of ice slides without friction down a long track. The start of the track is 4.2 m higher than the end of the tra
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Hello

1) Since there is no friction between the ice and the track, there is no loss of energy in the motion, so we can apply the law of conservation of energy.
The total energy E (sum of potential energy P and kinetic energy K) must be conserved:
E=P+K  

2) At the beginning of the motion, the total energy of the object is just potential energy:
E_1=P=mgh 
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3) At the end of the motion, this potential energy has converted into kinetic energy, and so the total energy at this point is 
E_2= \frac{1}{2}mv^2
where m is the mass and v is the final velocity of the object.

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E_1 = E_2
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mgh= \frac{1}{2}mv^2
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