The mass of the most objects is too small to cause a force large enough to notice. This is why you don't see the objects moving toward each other.
The Doppler Effect See related link
Light is a spectrum. On one end it is red and the other blue. We see light in this spectrum as waves and if it is blue, the object is coming toward us. If the waves are red than it is moving away. The frequency of these waves tell us how fast and object is moving toward or away from us.
Air
you cant see anything
you can't see it moving because your moving with it
The object will appear to be moving to the right in your visual field. This is because your visual field is moving to the left faster than the object is moving to the left. What you will see is that the object will appear in your visual field on the left, and the object will move across your visual field to the right.
A stationary frame of reference.
Technacially you cant its a glitch. But you can try just jumping toward the wall and see if it preforms a "glitch" or if there is an object next to the wall the wall all you have to do is jump on that object next or near the wall and try jumping a few times toward the wall and hopefully the "glitch" willbe preformed Good Luck!
They don't know, they just guess
The 1 way you can tell an object is in motion is by having a focus point that does not move and watch and see if the object you are looking for is moving. Another way to notice where the object is now, then later, check and see if the object has been moving. lastly, if you are a scientist, you can use telescopes, computers, and the latest gadgets to tell you if an object is in motion.
because termites are blind.