# 5th Science Unit 3 les 1-2

### 28 terms by sjlstreete

#### Study  only

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### position

location of an object

### motion

change in position of an object over time

### distance measurements

meters, kilometers, feet, miles

### direction measurements

compass, protarator, units of degrees

### frame of reference

needed to measure position or motion

### speed

the rate at which an object's position is changing over time

### units of speed

meters per second
kilometers per hour
feet per second
miles per hour

### velocity

the object's speed and its direction of motion

### acceleration

any change in the velocity over time of an object
(change in speed or direction)

### deceleration

negative acceleration

### momentum

object's mass multiplied by its velocity
mass x velocity

### greater inertia

the more mass an object has, the

### inertia

tendency of an object to resist a change in motion

newton
pound

### arrow

used to indicate the strenght and direction of a force

thrust
lift
drag

### gravity

force that pulls all objects together

### 2 factors - determines amount of friction

roughness of the surfaces (makes sliding difficult)
how amouont of force used to push the 2 objects together

### heat

created whenever there is friction

### Law of inertia

an object at rest tends to stay at rest,
and an object oin constant motion tends to stay in motion,
unless acted upon by an unbalanced force.

### balanced forces

effect is offset by other forces, so motion won't change;
often point in opposite directions and always add up to zero

### unbalanced forces

cause an object to change its motion

### object's acceleration decreases

as its mass increases if the force applied to the object remains the same

### air resistance

force that slows down objects that are moving through air

push or pull

### thrust

force that pushes an airplane forward

### Newton's law of universal gravitation

the force of gravity depends on distance and mass

### friction and drag

on Earth, these forces tend to slow an object down

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