We are still on the kinematics unit of physics in our class.
Kinematics is the branch of mechanics concerned with the motion of objects
without reference to the forces that cause that motion. The image below is a
picture of me running during a cross-country race. If someone were to ask if I was
moving, I would respond with “relative to what?” This is because all motion is
relative. Relative to the ground, I am moving. Relative to the people standing
on the side, I am moving away from them, and they are moving away from me, even
though they are standing still. Relative to the runners moving the same speed
as me, meaning their change in distance divided by change in time are the same,
I am not moving.
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