Kinematics

Mechanics is divided into two parts

  • Kinematics, the study of describing motion

  • Dynamics, the study of causes of motion

Rest - If the position of a body doesn't change with time, it's said to be at rest Eg. Your computer screen is at rest with respect to you.

In motion - If the position of a body changes with time, it's said to be in motion Eg. Your computer screen is in motion with respect to you if you are walking around the room, even if the computer screen is in the same place. This is because motion is relative.

*still, that's a typo

The person inside the room is at rest with respect to the room, while in motion with respect to the person outside. The person outside the room is in motion with respect to both the room and the person inside the room

You are always at rest with respect to yourself