slope car

It’s not directly derived from experiments, it’s derived from scientific reasoning

Content: All objects always remain at rest or move in a straight line at a uniform speed when no force is acted upon

Without the action of any force, the collective effect is equivalent to zero.

Newton's first law reveals the nature of force: force is not what maintains the state of motion of an object, force is the force that changes the state of motion of an object inertia

same object

equal size

opposite direction

same straight line

A state in which an object is at rest or moving in a straight line at a uniform speed is called equilibrium.

A change in the position of one object relative to another

If an object's position relative to a reference object changes, it is said to be in motion. If its position relative to the reference object does not change, it is said to be stationary.

Uniform linear motion

Variable speed linear motion.

The inclination of the slope should match the length of the board

Let the car slide freely from the appropriate position on the slope

The experiment should be carried out in the proper order