# Ms. Kasem Ch.3 Force and Motion Vocabulary

## 13 terms

### motion

The state in which one object's distance from another is changing.

### reference point

A place or object used for comparison to determine if an object is in motion.

### meter

The basic SI unit of length.

### speed

The distance an object travels in one unit of time

### velocity

Speed in a given direction.

### force

A push or a pull exerted on an object.

### net force

The overall force on an object when all the individual forces acting on an object are added together.

### unbalanced force

A nonzero net force that changes an object's motion.

### balanced forces

Equal forces acting on an object in opposite directions.

### friction

The force that one surface exerts on another when the two rub against each other.

### acceleration

The rate at which velocity changes.

### linear

The term used to describe the relationship between variables whose graph is a straight line.

### nonlinear

The term used to describe a relationship between variables whose graph is not a straight line.