# Chapter 5 - Newton's Second Law of Motion, Force and Acceleration

## 8 terms

### air resistance

Friction, or drag, that acts on something moving through air.

### fuild

Anything that flows; in particular, any liquid or gas.

### inversely

When two calues change in opposite directions, so that if one is doubled the other is reduced to one half, they are said to be inversely proportional to eachother.

### Newton's second

The acceleration produced by a net force on a body is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the body.

### pascal

The SI unit of pressure. One pascal (sympol Pa) of pressure exerts a normal force of one newton per square meter.

### pressure

Force per area where the force is normal to the surgace; measured in pascals.

### terminal speed

The speed at which the acceleration of a falling object is zero because friction balances the weight.

### terminal velocity

Terminal speed together with the direction off motion (down for falling objects).