13.1 test

Question 1

pressure

Answer 1

the result of a force distributed over an area

Question 2

to calculate pressure u have to

Answer 2

dive the force by the area over which the force acts

Question 3

what is the SI unit for pressure

Answer 3

pascal

Question 4

fluid

Answer 4

a substance that assumes the shape of its container

Question 5

water pressures increases as

Answer 5

depth increases

Question 6

The pressure at any depth is

Answer 6

constant

Question 7

what is a baro meter used for

Answer 7

to track Earth’s atmosphere

Question 8

air pressure _____ as depth ____

Answer 8

increases

Question 9

the Earth’s atmosphere exerts pressure about

Answer 9

10kPa sea level

Question 10

air pressure ____ as altitude _____

Answer 10

decreases, increases

Question 11

the atmosphere is exerting ____ newtons of force on top of your head

Answer 11

1000

Question 12

fluid exerts____

Answer 12

pressure equally in all directions at a given depth

Question 13

what is pascals principle

Answer 13

a change in pressure at any point in a fluid is transmitted equally and unchanged in all directions throughout the fluid

Question 14

hydraulic system

Answer 14

a device that useses pressurized fluid acting on pistons of different sizes to change force

Question 15

how does the hydraulic system work

Answer 15

an increased output force is produced because a constant fluid pressure is exerted on the larger area of the output piston

Question 16

what happens if u blow on a sheet of paper

Answer 16

the paper lifts upwards

Question 17

what is bernoulli’s principe

Answer 17

as the speed of a fluid increases, the pressure within the fluid decreases

Question 18

lift

Answer 18

the pressure difference between the top and the bottom of the wing created an upward force

Question 19

bouyancy

Answer 19

the ability of a fluid to excerpt an upward force on an object placed in it

Question 20

when does bouyancy occur

Answer 20

it results in the apprent loss of weight of an object in a fluid

Question 21

what is the bouyant force

Answer 21

a net upward force

Question 22

what is Archimedes principle

Answer 22

the bouyant force on an object is equal to the weight of the fluid displaced by the object

Question 23

what is the SI unit for density

Answer 23

grams per cubic cetimeter

Question 24

if an object is less dense then the fluid is it will

Answer 24

float

Question 25

suspended

Answer 25

float at any level

Question 26

objects float _____ in dense fluids

Answer 26

more easily

Question 27

is it easier for a person to float in saltb water or fresh water, why?

Answer 27

slat water because salt water is more dense