# Motion and Momentum (Ch.1)

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Study for Vocab. test on Monday (Nov.8)

### speed

the distance traveled divided by the time
(s=d/t)

### average speed

the total distance traveled divided by the total time taken

### instantaneous speed

the speed of an object at one moment in time

### acceleration

change in velocity divided by time taken for the change to take place

speed up

slow down

### velocity

speed and direction of a moving object

### inertia

tendency of an object to resist a change in it's motion

### momentum

a measure of how hard it is to stop a moving object; dependent on it'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

### collision

when two or more objects hit each other

### motion

a change in position

### relative motion

a change in position of one object compared to the position of another

### distance

how far an object moves

### displacement

the distance and direction an object moves relative to it's starting point

Example: