# Definitions

## Definitions

Definitions

### mass mass
(physics) The quantity of matter which a body contains, irrespective of its bulk or volume. It is one of four fundamental properties of matter. It is measured in kilograms in the SI system of measurement.

### weight weight
The force on an object due to the gravitational attraction between it and (typically) the Earth.

### displacement displacement
(physics) A vector quantity which denotes distance with a directional component.

### force force
In physics, a force is a push or pull that can cause an object with mass to accelerate. Force has both magnitude and direction, making it a vector quantity.

### free body diagram free body diagram
A free body diagram is a pictorial representation often used by physicists and engineers to analyze the forces acting on a free body. It shows all contact and non-contact forces acting on the body. Drawing such a diagram can aid in solving for the unknown forces or the equations of motion of the body.

### equilibrium equilibrium
(physics) The state of a body at rest or in uniform motion in which the resultant of all forces on it is zero.

### slope slope
1. (mathematics) The ratio of the vertical and horizontal distances between two points on a line; zero if the line is horizontal, infinite if it is vertical. The slope of this line is 0.5.
2. (mathematics) The slope of the line tangent to a curve at a given point. The slope of a parabola increases linearly with x.