# melody and anthony

## 20 terms

### Motion

a change of position that does not entail a change of location

### Forces

pushes or pulls between objects

### Gravity

(physics) the force of attraction between all masses in the universe

### Weight

a system of units used to express the weight of something

### Mass

the property of something that is great in magnitude

### Terminal Velocity

the constant maximum velocity reached by a body falling through the atmosphere under the attraction of gravity

### Free fall

the motion of a falling object when the only force acting on it is gravity

### Projectile Motion

the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth

### inertia

(physics) the tendency of a body to maintain is state of rest or uniform motion unless acted upon by an external force

### Fluid

a continuous amorphous substance that tends to flow and to conform to the outline of its container: a liquid or a gas

### pressure

the force applied to a unit area of surface

### pascal

a unit of pressure equal to one newton per square meter

### atmospheric pressure

the pressure caused by the weight of the atmosphere

### Buoyant Force

upward force exerted on an object immersed in a fluid

### newton

a unit of force equal to the force that imparts an acceleration of 1 m/sec/sec to a mass of 1 kilogram

### net force

the combination of all forces acting on an object

### velocity

the speed of an object in a particular direction

### acceleration

The rate at which velocity changes

### average speed

a rate of motion determined by dividing the total distance traveled by the total travel time

### friction

the force that opposes the motion of one surface as it moves across another surface