This is matter of simple geometric relationships between triangles. For triangles to be of the same proportion, what you ha e to do is change all sides by the same factor as you change any one side.
The Moon is about 3,476 km in diameter, Mars has a diameter of 6,800 km (essentially twice as big). To appear to have a diameter the same as the Moon's, Mars would have to be about twice as far away. The Moon is 384,403 km away so Mars in the "as large as the moon" case would be about twice this distance or 768,800 km away.
The moon does; it causes the tides. Mars is just there ... without it Earth would be just the same.
the moon because its closer to earth
No, it does not. The earth has a moon, and Mars does not. It is earth's moon, earth and the sun that are involved in eclipses. All of them. Without a moon, Mars cannot experience an eclipse.
no, say if you weighed 1kg on earth than you would weigh 0.1 on the moon and 0.3 on mars
mars and the moon is not a planet
No. The moon is closer to Earth than Mars is, but it orbits Earth independent of the motion of Mars. Sometimes the moon may appear right next to Mars in the sky while at other times it may be opposite Mars.
earth has but one moon
The Earth's distance from the moon or Mars is always changing. The closest the moon can get to Earth is 225,622 miles. The farthest it can get is 252,088 miles. The closest possible distance from Earth to Mars is 33.9 million miles. Therefore the Earth is always much closer to the moon than Mars, no matter where they are in orbit.
No, Mars is much larger than Earth's moon.
Without a telescope you probably couldn't see earth's moon from Mars.
Mars is tremendously farther away from the Earth than the moon is.
Venus and Mars