# ch.3 projectile motion

## 8 terms

### Vector Quantity

A quantity in physics, such as force, that has both magnitude and direction.

### Scalar Quantity

A quantity in physics, such as mass, volume, and time, that can be completely specified by its magnitude, and has no direction.

### Vector

An arrow whose length represents the magnitude of a quantity and whose direction represents the direction of the quantity.

### Resultant

The vector sum of two or more component vectors.

### Component

One of the vectors, often mutually perpendicular, whose sum is resultant vector. Any resulant vector may be regarded as the combination of wo or more components.

### Resolution

The process of resolving a vector into components. In optics, a measure of how well closely adjacent optical images are disinguished.

### Projectiles

Any object that moves through the air or through space, acted on only by gravity (and air gravity resistance, if any).

### Satellite

An object that falls around earth or some other body rather than falling into it.