Key Differences
* Position: A moving object changes its position relative to a fixed point (like a wall, a tree, or the ground) over time. Objects at rest maintain their position.
* Velocity: A moving object has a velocity, which is its speed and direction. Objects at rest have zero velocity.
* Momentum: A moving object possesses momentum, which is a measure of its mass and velocity. Objects at rest have zero momentum.
* Energy: A moving object has kinetic energy, the energy of motion. Objects at rest have zero kinetic energy.
Frames of Reference
It's important to remember that motion is relative. This means:
* Everything is moving: Even objects that seem "still" are actually moving relative to other objects. For example, you might be sitting in a chair that seems stationary, but you are moving with the Earth as it rotates on its axis and orbits the Sun.
* Motion is based on your point of view: If you are in a car that is moving, you might see a person walking on the sidewalk as "moving," while the person on the sidewalk sees themselves as stationary and you as moving.
Examples
* A car driving down the road is in motion compared to a parked car.
* A ball rolling across the floor is in motion compared to a book sitting on a shelf.
* A bird flying in the air is in motion compared to a tree.
In summary, motion is a change in position over time. Objects at rest do not experience this change.
