# Science

## 10 terms

### air resistance

Frictional force air exerts on a moving object; acts opposite in direction to the object's motion

### artificial satellite

Human-made device that orbits Earth; used for communication' weather monitoring, military, and scientific purposes

### centripetal acceleration

Acceleration toward the center of a circle by an object moving along a circular path

### centripetal force

The force causes an object moving along a circular path to move toward the center of the path

### law of conservation of momentum

A law stating that the total momentum of a group of objects is conserved unless a net force acts on the objects

### momentum

A property of any moving object; the momentum (p) of an object is the product of its mass and velocity

### Newton's second law of motion

Describes the acceleration of an object in the direction of the net force applied to it. Expressed in equation form as force= mass X acceleration, or F=ma

### Newton's third law of motion

Describes action- reaction pairs; for every action force, there is an equal and opposite reaction force

### projectile

Any object shot or thrown through the air

### terminal velocity

The greatest velocity reached by a falling object. It is achieved when the force of gravity is balanced by air resistance

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