# Chapter 7 - Forces in Fluids

## 12 terms · Mr_mills, AAA, Physical Science

### Fluid

any material that can flow and that takes the shape of its container

### Pressure

the amount of force exerted on a given area; expressed in pascals

### Pascal

the SI unit of pressure; equal to the force of 1 N exerted over an area of one square meter

### Atmospheric Pressure

the pressure caused by the weight of the atmosphere

### Density

the amount of matter in a given space; d=m/v

### Pascal's Principle

change in pressure at any point in an enclosed fluid is transmitted equally to all parts of the fluid

### Buoyant Force

the upward force that fluids exert on all matter; buoyant force opposes gravitational force

### Archimedes' Principle

States that the buoyant force on an object in a fluid is an upward force equal to the weight of the volume of fluid that the object displaces

### Bernoulli's Principle

says that an increase in the speed of the motion of fluid decreases the pressure within the fluid

### Lift

an upward force on an object (such as wings) that opposes the downward pull of gravity; differences in pressure above and below the object contribute to lift

### Thrust

the forward force produced by an airplane's engines; thrust opposes drag

### Drag

The force that opposes or restricts motiion in a fluid; drag opposes thrust.