# M1 - Motion & Momentum

## 20 terms

### speed

distance traveled divided by the time it takes to travel that distance

### average speed

total distance traveled divided by the total time taken to travel the distance

### instantaneous speed

speed of an object at one moment in time

### velocity

speed and direction of a moving object

### positive acceleration

when acceleration is in the direction that an object is moving, and speed increases

### inertia

tendency of an object to resist a change in its motion, depends on the mass of the object

### momentum

a measure of how hard it is to stop a moving object; dependent on the object's mass and velocity

### law of conservation of momentum

the total momentum of objects that collide with each other is the same before and after the collision

### motion

a change in position

### distance

total length of the route traveled

### displacement

the direction and shortest distance from starting point to end point

### relative motion

a change in position of an object relative to a reference point

### negative acceleration

when acceleration is against the direction an object is moving, and the speed decreases

### collision

when two or more objects hit each other

### acceleration

occurs when an object speeds up, slows down, and/or changes direction; how quickly velocity changes; change in velocity divided by the time taken for the change to take place

### m/s

meters per second, a unit for speed

### km/h

kilometers per hour, a unit for speed

### kg.m/s

kilogram.meters per second, the unit for momentum

### m/s/s

meters per second per second, or meters per second squared (m/s2), unit for acceleration

### mass

amount of matter in an object, measured in kilograms

Create Set