CH 13 Liquids

Question 1

Pressure

Answer 1

The force per unit area that one object exerts on another

Question 2

Pressure equation

Answer 2

Pressure = Force / area

Question 3

Pressure depends on the area

Answer 3

The area over which force is distributed

Question 4

When you stand on one foot instead of two, the force you exert on the floor is ?

Answer 4

The same.

The between force and pressure! The weight is the same, it is the force

Question 5

When you stand on one foot instead of two, the pressure you exert on the floor is

Answer 5

More.Twice as much, in fact! Pressure is no the same as force.

Question 6

The deeper you swim

Answer 6

The greater the pressure.

Question 7

Pressure is ________ dependent not _________ dependent

Answer 7

Depth dependent and not volume dependent.

Question 8

Pressures act _______ in all directions

Answer 8

Equally

Question 9

Whatever the shape of a container pressure is

Answer 9

At any particular depth is the same.

Question 10

Liquid pressure =

Answer 10

weight density ´ depth

Question 11

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

Answer 11

Water pressure provided by a water tower is greater if the tower is TALLER.

Question 12

Water pressure acts ________ to surfaces of a container and on objects inside the liquid.

Answer 12

Acts perpendicular to surfaces

Question 13

Buoyancy in a Liquid =

Answer 13

= support force

Question 14

Buoyancy

Answer 14

The apparent loss of weight of a submerged object.

Question 15

Lifting a heavy object under water is easier than lifting it on the surface because

Answer 15

Because the water exerts an additional SUPPORT force. This extra UPWARD, support force is called the BUOYANT force.

Question 16

With buoyancy the ________ _________ on the side cancel each other out.

Answer 16

Force vectors

Question 17

How many forces actually form the net force on a submerged body in a fluid?

Answer 17

B.Two—buoyancy and the force due to gravity

Question 18

The volume of the water displaced is _______ to the ________ of the stone [object in the water].

Answer 18

EQUAL to the volume

Question 19

Displacement rule

Answer 19

A completely submerged object always displaces a volume of liquid equal to its own volume.

Question 20

Archimedes’ Principle

Answer 20

An immersed object is buoyed up by a force equal to the weight of the fluid it displaces.

Question 21

The reason a person finds it easier to float in saltwater compared with freshwater is that in saltwater

Answer 21

Neither. A floating person has the same buoyant force whatever the density of water. A person floats higher because a smaller volume of the denser saltwater is displaced.

Question 22

Whether an object floats or sinks depends upon the

Answer 22

• volume of the object.
• volume of the fluid displaced.

Question 23

For an object to float:

Answer 23

The buoyant force (weight of the liquid it displaces) must be equal or more than weight of the object itself.

Question 24

Principle of flotation

Answer 24

A floating object displaces a weight of fluid equal to its own weight.

Question 25

Float or sink rule #1

Answer 25

1. An object more dense than the fluid in which it is immersed will sink.

Question 26

Float or sink rule #2

Answer 26

2. An object less dense than the fluid in which it is immersed will float.

Question 27

Float or sink rule #3

Answer 27

3. An object having a density equal to the density of the fluid in which it is immersed will neither sink nor float. = for all fluids

Question 28

A crocodile increases its ________ in order to sink as it approaches prey.

Answer 28

Density

Question 29

Test ?’s

Water pressure at the bottom of a lake depends on the

Answer 29

C. depth of the lake.

Question 30

Test ?’s

When a submarine takes water into its ballast tanks, its density _______.

Answer 30

increases

Question 31

Test ?’s

**The buoyant force that acts on a 20,000-N ship is **

Answer 31

a.20,000 N.

Question 32

Two solid blocks of identical size are submerged in water. One block is lead and the other is aluminum. Upon which is the buoyant force greater?

Answer 32

B.Same on both blocks

Question 33

When you float in saltwater and not in freshwater, the volume of water displaced is

Answer 33

a.less and the buoyant force is unchanged.

The volume of water displaced is less, its weight equals your weight. Ma

Question 34

The buoyant force that normally acts on a fish under water is

Answer 34

C.equal to its weight.

however deep a fish swims, it displaces a weight of water is the same as

Question 35

Pascal’s Principle - 17th century

Answer 35

A change in pressure at any point in an enclosed fluid at rest is transmitted undiminished to
all points in the fluid.

Question 36

T/F Pascal’s Principle applies to all fluids, which include gases and liquids.

Answer 36

True.

a balloon squeezes one end it gets tighter as the air is moved to the ot

Question 37

The contractive tendency of the surface of liquids is due to ______ ________

Answer 37

surface tension

Question 38

Drops of any kind are spherical because

Answer 38

their surfaces tend to contract and force each drop into the shape having the least surface area for a given volume – a sphere.

Question 39

1

Factors affecting surface tension:

#1

Answer 39

1. The type of liquid

– Water has greater surface tension than oil.

Question 40

Factors affecting surface tension:

#2

Answer 40

2. What is mixed with the liquid

– Soapy water has lower surface tension than water without soap.

Question 41

Factors affecting surface tension:

#3

Answer 41

3. Temperature of the liquid

– The molecules in a hot liquid have higher energy and are not bou

Question 42

Factors affecting surface tension:

#3

Answer 42

3. Temperature of the liquid

– The molecules in a hot liquid have higher energy and are not bou