Because motion can only be perceived from the perspective of another object. Is it difficult to catch something moving at 100 km/h? Not if you are talking about picking up your coffee cup in your car when you are driving down the highway. Of course the car is travelling at 100 km/h as are you and as is the coffee cup and everything else in the car. Relative to each other, all of these things are not moving. But relative to the road surface, they are all travelling at 100 km/h.
motion
deflection of moving objects when the motion is described relative to a rotating reference frame.
Relative motion
Relative motion is the concept that the motion of all objects is relative to other objects. If you are sitting still right now you are not moving relative to the earth, however you are moving relative to sun.
All motion is relative to yourself, as there is no fixed point anywhere in our universe, as it is all traveling away from the center of the big bang. But if we ever find where the bigbang happened, that would be where all motion is relative to
motion
deflection of moving objects when the motion is described relative to a rotating reference frame.
Relative motion
Relative motion
In simple motion can be described as the movement of any object.
Motion is relative to an observer's frame of Reference.
Relative motion is the concept that the motion of all objects is relative to other objects. If you are sitting still right now you are not moving relative to the earth, however you are moving relative to sun.
At rest and in motion are relative terms. When we say 'in motion' or 'at rest' we mean relative to something else. If you were travelling in a car for instance, you would be at rest relative to the car but in motion relative to the outside world.
motion is realtive
All motion is relative to yourself, as there is no fixed point anywhere in our universe, as it is all traveling away from the center of the big bang. But if we ever find where the bigbang happened, that would be where all motion is relative to
When its position is changing relative to our position. Note: all motion is relative to something else.