# physical science: ch. 6 ch.7 ch.11

## 30 terms

### mass

around 400 b.c. , Aristotle thought that a object's fall depended on its _____

### all, rate

Galileo challenged Aristotle's idea stating that ___ objects fall at the same ____

### mass, pull

objects with more ____ need more ____ to experience the same rate of fall

### 9.8 m/s 2

all objects accelerate towards the earth at the same rate of:

### air resistance

even though all objects accelerate at the same rate, not all objects experience the same velocity because of ______ ________

### terminal velocity

this force called ________ ________ will eventually stop the acceleration of all objects on earth.

### newtons 1st law

an object at rest will stay at rest until it experiences an unbalanced force and an object in motion will stay in motion unless acted on by an unbalanced force.

### newtons 2nd law

an objects acceleration is dependent on its mass and the force acting on it

### newtons 3rd law

for every force there is an equal and opposite force

### false

TRUE or FALSE: force pairs can act on the same object

### inertia

tendency of objects to resist changes in motion.

### mass

____is the measure of an object's inertia

### mass, velocity

momentum is the measure of an objects

### transferred

momentum can leave a object but only if it is _______ to another object

### p= m x v

how do you calculate momentum?

### law of conservation of momentum

momentum cannot be created or destroyed

### inelastic and elastic

momentum transfers in 2 ways......______ and _______

### flow

fluid is any substance that is easily ____

### force,area

pressure is a description of a ____ pushing on a _____

### area (m2)

how do you measure surface?

### pressure=force/area (pa)

equation for pressure

### water, atmospheric

the two main types of pressure

### gases

atmospheric pressure is caused by the layer of _____ surrounding the earth.

### fluids in our body push out

why doesn't atmospheric pressure crush us?

### water

water pressure is caused by ____

### buoyant force

fluids exert an upward force on a objected called _____ _____

### displacement

when you put a object in a full container of water what happens?

### buoyant force, weight

objects will sink based on relationship between _______ and _______ of object

### 1.0 g/cm3

what is the density of water?

### bernoulil's principle

faster the faster moves, more pressure decreases