# science ch 3

## 23 terms

### acceleration

rate of change of velocity

### force

a push or pull exerted on an object

### friction

the force that opposes the sliding motion between two touching surfaces

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### static friction

frictional force that prevents two surfaces from sliding past each other

### rolling friction

A force which opposes the motion of any body which is rolling over the surface of another.

### fluid friction

is the friction between a solid object as it moves through a liquid or a gas

### kinetic friction

Kinetic friction is friction applied to a moving object

### air resistance

force that opposes the motion of objects that move through the air.

### sliding friction

friction that opposes the motion of two surfaces sliding past each other.

### terminal velocity

the point at which a falling object can go no faster

### net force

sum of forces that are acting on an object.

### gravity

attractive force between to objects that depends on the masses of the objects and the distance between them.

### inertia

resistance of an object to a change of its motion

### weight

gravitational force exerted on an object

### projectile

an object flying through the air

### momentum

property of a moving object that equals its mass x velocity

### centripetal force

a net force that is directed toward the center of a curved or circular path.

### action-reaction

part of newtons 3rd law for every action force their is an equal and opposite reaction force

### velocity

the speed and direction of a moving object

3 laws of motion

### projectile motion

This is the path defined by a projectile

### free fall

an object falling through the air with no attachments (parachutes etc.)

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