air pressure
All molecules are in constant motion. Molecules of a liquid have more freedom of movement than those in a solid. Molecules in a gas have the greatest degree of motion. Heat, temperature and the motion of molecules are all related. Temperature is a measure of the average kinetic energy of the molecules in a material. Heat is the energy transferred between materials that have different temperatures. Increasing the temperature increases the translational motion of molecules Energy is related to temperature by the relationship: E= kT
The motion of molecules determines
The more heat energy something has, the faster it moves. As long as an atom has some heat energy, it will move. Atom only cease all motion at 0 degrees Kelvin. To the best of my knowledge, that has never been achieved artificially nor does that temp exist in the Universe naturally.
Diffusing molecules never stop moving. In fact, no particle (atom, molecule) ever stops moving. All particles are in constant random motion, but in solids they just vibrate.
Objects moving in uniform circular motion will have a constant speed, and two objects with the same acceleration have a constant velocity.
air pressure
Pretty much everything bigger than an atom.
yes
The friction (with the air molecules) would slow it down.
Newton's First Law called the Law of Inertia, deals with objects having constant motion staying in a straight-line.
air pressure is caused by the constant motion of air molecules
If the forces on an object are unbalanced then the objects motion will change. It will start accelerating in the direction of the resultant force. Only objects that have balanced forces will remain in the same motion (stationary or moving at a constant speed).
An object in motion.
Yes, the molecules of a gas are constantly in a random motion if the gas temperature is more than 0 degree kelvin. This random motion determines the average kinetic energy of the molecules which is equal to the temperature of the gas. I hope this answers your question.
yes. friction is the action of one object's molecules hittings another objects molecules and creating an opposite force to slow the objects that are in motion down
All molecules are in constant motion. Molecules of a liquid have more freedom of movement than those in a solid. Molecules in a gas have the greatest degree of motion. Heat, temperature and the motion of molecules are all related. Temperature is a measure of the average kinetic energy of the molecules in a material. Heat is the energy transferred between materials that have different temperatures. Increasing the temperature increases the translational motion of molecules Energy is related to temperature by the relationship: E= kT