do you mean use the flashight with special mode? it could be set as lock or memory function.
Nothing has happened except you literally switched spots with your friend. An old wives tale says that you will switch lives if you do this but it is not true.
Mostly positive side switched but it has a couple ground side switches also such as the courtesy lights.
yes, but the earth rotates so that a new piece of the earth faces the sun day in and day out. this is what causes day and night on the planet. (Shine a flashlight on an orange, and turn the orange in your hand.)
YES. It's on the side.
By squeezing the bar on the side, it generates and produces electrons in the flashlight; thereby emanating the LED lights!
The side that faces away from the flashlight or the sun is always the dark side.
The lighter colored halves of the moon and earth are always facing the sun because of their positions in relation to the sun. As the moon orbits the earth and the earth orbits the sun, the side that is illuminated by the sun is the side facing the light source. This creates the phases of the moon and day/night cycle on earth.
Yes, as what determines whether it is day or night is if we are on the side of the Earth facing towards or away from the sun. An eclipse of the sun occurs when the moon passes between the Earth and the Sun, and we may be on the side of the Earth facing away from the Sun when it occurs.
The tilt of the Earth is what causes seasons to occur. When the Southern hemisphere is tilted towards the sun, it receives more sunlight than it would when it was tilted away from the Sun. The same principle apply to the Northern hemisphere. Imagine holding a flashlight directly above the table. Then shine the flashlight at a 45 degree angle at the table. The tilt of the light makes the intensity on the table decrease, just as the intensity of the Sun will decrease when one side of the Earth tilts away from the sun.
china
Half of the earth is always dark because the Earth is opaque and the side facing the sun blocks sunlight from reaching the other side of the Earth. If we were in a star system with multiple stars we might have a chance of having more than half of the surface of the Earth illuminated but as we only have the one sun we will always have day and night. Note that strictly speaking the dark side of the earth is not totally dark - it gets some reflected light from the moon most of the time and a tiny bit of light from the stars, not to mention all the anthropogenic light sources that get switched on at night.
Yes, they can be switched to whichever way is most convenient. The goal is to maintain positive pressure through the crankcase.