Liquids Quiz a (01.20.2021)

Question 1

___ is the force per unit area that one object exerts on another

Answer 1

pressure

Question 2

pressure equals…

Answer 2

force / area

Question 3

pressure depends on…

Answer 3

area over which force is distributed

Question 4

3 main units for pressure

Answer 4

N/m^2, lb/ft^2, or Pascals

Question 5

Why does a person lying on nails remain unharmed?

Answer 5

force is applied over many nails; combined surface area of the nails results in a tolerable pressure and does not punture the skin

Question 6

if you stand on one foot instead of two, force you exert on the floor is the ____, but pressure you exert is ___

Answer 6

same; more/twice

Question 7

pressure in a liquid is the force per unit area that a liquid exerts on an object; it is ____ dependent not ___dependent

Answer 7

depth; volume

Question 8

swim twice as deep, then twice as much weight of water above you produces ___ as much pressure on you

Answer 8

twice

Question 9

liquid pressure =

Answer 9

weight density x depth

Question 10

weight density =

Answer 10

weight / volume

Question 11

pressure in a liquid is independent of ______

Answer 11

shape of container; whatever the shape of a container, pressure at any particular depth is the same

Question 12

water pressure provided by a water tower is greater if the tower is ____

Answer 12

taller

Question 13

water pressure acts ____ to surfaces of a container. liquid spurts at right angles form a hole in the surface

Answer 13

perpendicular

Question 14

the greater the depth, the ____ the existing speed

Answer 14

greater

Question 15

buoyancy is…

Answer 15

the apparent loss of weight of a submerged object

Question 16

buoyancy amount equals the________

Answer 16

weight of the water displaced

Question 17

displacement rule: a completely submerged object always displaces…

Answer 17

a volume of liquid equal to its own volume

Question 18

place a stone in a container that is brimful of water, and the amount of water overflow ____ the volume of the stone

Answer 18

equals

Question 19

buoyant force is…

Answer 19

the net upward force that a fluid exerts on an immersed object

Question 20

buoyant force is equal to the….

Answer 20

weight of water displaced

Question 21

the difference in the upward and downward forces acting on the submerged block is the same at any depth. How many forces act on a submerged body at rest in a fluid?

Answer 21

two - buoyancy and the force due to gravity

Question 22

When weight of submerged object is greater than the buoyant force, the object ____

Answer 22

sinks

Question 23

When the weight of a submerged object is equal to buoyant force - object will rremain at any level and will______

Answer 23

neither sink nor float

Question 24

when the weight of submerged object is less than the buoyant force it would have when submerged, the object ____

Answer 24

floats

Question 25

when floating, buoyant force equals _____

Answer 25

weight of floating object

Question 26

Archimedes Principle relates buoyancy to displaced liquid. It states that an immersed body (completely or partially) is buoyed up by _____ - it applies to gases and liquids

Answer 26

a force equal to the weight of the fluid it displaces