The safest way is to match your velocity exactly to the velocity of the moving object.
That way, it's at rest in your frame of reference, and if it ever hits you, you won't feel
a thing.
you be a boss and just look at it
It was Brown. They named it Brownian motion after her.
The moon/sun moving across the sky shows motion/rotation.
You can observe its motion or deformation.
You observe its motion, with respect to the background stars.
Build a very large pendulum and set it in motion. Then observe, think and explain what you observe over the course of a day.
Through specially heavy tinted glass designed specifically for such observations.
No, vibrational motion is often difficult to observe with the naked eye because it occurs at a very fast rate and with a small amplitude. Special equipment such as high-speed cameras or scientific instruments like spectrometers are typically needed to study vibrational motion closely.
Motion is always relative to the observers frame of reference. For example, if two people were standing facing each other, and a dog walked between them, one person would observe the dog's motion as going to the right, and the other person would observe the dog's motion as going to the left.
Newton's first law of motion categorizes any force affecting the motion as an external force. Friction being an external force, negates its presence as an integral force of a motion. Hence friction cannot be used to observe first law of motion.
The mass of the object must be very small in order for its wavelength to be large enough to observe.
Those who can afford it physically, financially, and safely.