Density and Buoyancy

Question 1

a technique for measuring the volume of an irregularly shaped object

Answer 1

displacement

Question 2

the measure of the force of gravity acting upon the mass of an object

Answer 2

weight

Question 3

density of air

Answer 3

0.0013 g/cm3

Question 4

density of styrofoam

Answer 4

0.005 g/cm3

Question 5

formula for finding mass

Answer 5

density x volume (D x V)

Question 6

neutral buoyancy

Answer 6

the condition in which the forces acting on and object ( that is submerged in or floating on a fluid ) are balanced

Question 7

the amount of mass in a certain volume; how tightly packed together the material is in a substance

Answer 7

density

Question 8

formula for finding volume

Answer 8

mass/density (mass divided by density)

Question 9

the space occupied by an object or substance

Answer 9

volume

Question 10

mass to volume ratio

Answer 10

the value equal to the density of a substance

Question 11

Archimedes’ Principle

Answer 11

1) explains why objects sink or float
2) buoyant force acting on an object is the same as ( = ) the weight of fluid displaced
3) if the amount of water displaced by the object is more than ( or heavier ) than the weight of the object, the object will float and vice versa

Question 12

true or false: it is easier to lift your leg while standing in water than while standing on land

Answer 12

true

Question 13

Archimedes observed that his body seemed heavier in water.

Answer 13

false; his body was lighter in water

Question 14

buoyant force

Answer 14

the upward force on objects submerged in ( under the surface of ) or floating on a liquid

Question 15

steps on finding the density of a liquid ( 1 - 4 )

Answer 15

1. find the mass of an empty graduated cylinder
2. record the mass of empty cylinder
3. pour liquid into cylinder
4. record volume of liquid ( how much mLs? )

Question 16

steps on finding the density if a liquid ( 5 - 8 )

Answer 16

5. place cylinder with liquid on scale
6. record mass of cylinder and liquid ( how many grams? )
7. to find mass of liquid: mass of empty cylinder - mass of cylinder and liquid
8. calculate density of liquid (mass divided by volume)

Question 17

mass

Answer 17

how much matter an object has

Question 18

density of alcohol

Answer 18

0.8 g/cm3 ( or mL )

Question 19

if something has neutral buoyancy it will neither …

Answer 19

float nor sink

Question 20

what did Archimedes say when he discovered his principle?

Answer 20

Eureka! “i have found it!”

Question 21

an instrument that measures density

Answer 21

hydrometer

Question 22

float or sink: rock weighs 10N , displaces 12 N water

Answer 22

float ( water weighs more )

Question 23

pebble weighing 0.1 N , displaces 0.05 N water

Answer 23

sink (water weighs less)

Question 24

density of gold

Answer 24

19.32 g/cm3

Question 25

float or sink: 3 N box , displaces 2 N water

Answer 25

sink

Question 26

buoyancy is an upward force exerted only by water

Answer 26

false

Question 27

true or false: Archimedes’ Principle states that the buoyant force on an object in a fluid equals the weight of the fluid it displaces

Answer 27

true

Question 28

when an object is placed in water, the water exerts an upward force on the object

Answer 28

true

Question 29

buoyant force opposes the downward pull of gravity (weight) on an object

Answer 29

true