# Science 4-13-12 Quiz vocab

## 18 terms · Chapter 3 Section 1-2 Vocab for 4-13-12 Quiz

### force

Push or pull on an object

### Newton's Second Law of Motion

The net force acting on an object causes the object to accelerate in the direction of the force.

### Friction

The force that opposes motion between two surfaces that are touching each other

### Microwelds

responsible for the friction

### Static Friction

Friction that forms between two surfaces that are not in motion

### Sliding Friction

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

### Rolling Friction

Friction between two surfaces rolling past each other.

### Air resistance

- opposes downward motion
- a force that resists an object's motion

### vacuum

a place where no air is present

### Terminal Velocity

a speed where air resistance balances the pull of gravity

### Law of Gravitation

Any two masses exert an attractive force on each other

### Basic Forces

Gravity
Electromagnetic
Strong nuclear force
Weak nuclear force

### Gravity

the force that gives the universe its structure.

### Weight

The gravitational force exerted on an object

### Projectile

Anything propelled through the air or space.

### Acceleration

the rate of change of velocity

### Centripetal Acceleration

Acceleration along a curved surface or path.

### Satellites

Anything in around another body