# Chapter 2 Science

## 12 terms

### Distance

how far an object has moved (measured in centimeters, meters, or kilometers)

### Displacement

is the distance and direction of an objects change in position from the starting point

### Speed

is the distance an object travels per unit of time

### Average speed

is the total distance traveled divided by the total time of travel

### Instantaneous speed

is the speed at a given point in time

### Velocity

includes the speed of an object and the direction of its motion

### Acceleration

how quickly velocity changes over time, when the velocity of an object changes the object is accelerating

### force

is a push or pull acting on an object

### scalar

a measurement that does not contain a direction, speed

### vector

a measurement that does contain a direction, velocity

### balanced forces

if two equal forces are applied to an object in opposite direction, the object does not move or it moves at a constant speed

### unbalanced forces

if two unequal forces are applied to an object in opposite directions and the object does not move