The distance from the center of a circle to an edge.

The distance across a circle from edge to edge that passes through the center.

How much space an object takes up.

The length of the perimeter of a circular object.

The size of a surface.

An educated guess prior to experimentation.

An educated analysis after experimentation.

Studying what units other units are made of.

The ratio between a circle's diameter and circumference.

The numerical value or size of a quantity.

A quantity that has only magnitude.

The study of matter and energy and how they interact.

The study of motion.

The shortest distance between two points.

Directionless change in position over time.

Displacement over time.

A change in velocity over time.

The acceleration of a free falling object.

How much matter an object is made of.

How strongly a celestial body is pulling down on an object.

A resistant force perpendicular to the surface.

A push or a pull.

A force parallel to the surface opposing motion.

A force parallel to the surface opposing attempted motion.

An object at rest or in motion remains at rest or in motion unless acted on by an unbalanced force.

Force is the combination of an object's mass and acceleration.

For every action, there is an equal and opposite reaction.

A quantity that has both magnitude and direction.

Part of a whole vector.

A diagram illustrating all of the forces acting on an object.

The study of forces.

The ability to do work.

An applied force through some successful displacement.

How much work an object does over time.

The energy of motion.

The stored energy of an object relative to ground.

The combination of an object's mass and velocity.

A diagram illustrating the momentum of colliding objects.

A type of collision where colliding objects bounce off each other.

A type of collision where colliding objects do not bounce off each other.

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