Fluids, science test

Question 1

What are fluids?

Answer 1

Fluid is a substance that has no fixed shape and yields easily to external pressure and consist of a gas or a liquid.

Question 2

What are examples of fluids?

Answer 2

Water, air blood, honey, milk oil.

Question 3

Where can we find fluids?

Answer 3

Water vapor, rivers, lakes, oceans, glaciers, soil moisture and in the body.

Question 4

How can fluids be used?

Answer 4

Fluids can be used in many different ways, for example, washing clothes, washing dishes, wash your hands, quench your thirst, and also to make electricity.

Question 5

What is something fluids can do that solids can’t?

Answer 5

Fluids take the space of its container and it flows.

Question 6

What is an important way that fluids are in our lives?

Answer 6

Not only do we use fluids, such as air and water to stay alive. The human body is mostly made up of fluids. Each of us is about 60 to 70% water.

Question 7

What is matter?

Answer 7

Matter is anything that takes up space and has mass.

Question 8

What is mass?

Answer 8

Mass is the amount of matter.

Question 9

What is volume?

Answer 9

Volume is the amount of space an object takes up.

Question 10

What are the five postulates of the particle theory of matter?

Answer 10

1. All matter is made up of tiny particles. 2. Particles have empty space between them
2. Particles are moving randomly all the time
3. Particles move faster and spread apart when they’re heated
4. Particles attract each other.

Question 11

What does a particles look like in a solid?

Answer 11

Solids have a definite shape and volume. Although the particles of a solid or in constant motion, the forces of attraction is so strong that the particles vibrate very small distances around the central point. The particles are more or less locked in place and they cannot move past one another. This is why solids are generally not fluids.

Question 12

What are the particles inside of a liquid look like?

Answer 12

Particles of liquids are farther apart than particles of solids. They all bond less tightly, and are free to move past one and another. The forces of attraction among particles of liquids are still strong enough to hold the liquid together.

Question 13

What did the particles in a gas look like?

Answer 13

The particles of a gas are much farther apart, and the forces of attraction is extremely small. Gas particles spread out and fill whatever container they are placed in.

Question 14

How is the motion of particles in a liquid different from the motion of particles in a solid? 

Answer 14

The motion of particles in a liquid are different from the motion of particles in a solid is because liquid particles have more room to move around and more space between each particle to move past each other, but in a solid, the particles do not necessarily move past each other or move, but vibrate as well, as are more attracted to each other.

Question 15

How is the motion of particles in a gas difference in the motion of particles in a liquid?

Answer 15

The motion of particles in a liquid close together, and slide past one another. But in a gas the particles
have very little attraction to each other, and are very far apart when you compare it to a liquid or a solid .

Question 16

What is thermal expansion?

Answer 16

When the temperature of a solid liquid or gas increases its particles move faster and farther apart as a result, the substance expands. Thermal expansion is an increase in the volume of a substance in response to an increase of its temperature.

Question 17

What is contraction?

Answer 17

When the temperature of a solid liquid or gas decreases its particles, move more slowly, and closer together as a result, a substance shrink or contracts, substances, expand or contract with changing of temperature at the own particular rate.

Question 18

Why do engineers build gaps in railways and on bridges?

Answer 18

The reason the engineers built these gaps in railways and bridges. To prevent potholes, these gaps allow the water go somewhere other than getting below the concrete, which goes in by small cracks that I made over time by car is passing through because when this water in the winter goes into these cracks it gives it the chance to freeze and expand.

Question 19

What is viscosity?

Answer 19

Viscosity measures of fluid resistance to flow.

Question 20

How does adding heat to a liquid affect its viscosity?

Answer 20

When you add heat to a liquid the particles in a liquid start to move faster as well as move farther apart. Also, what happens when you add heat to liquid the viscosity lowers and it is less resistant to flow.

Question 21

How does removing heat from a liquid affect the viscosity?

Answer 21

When you remove heat from a liquid the particles in a liquid start to move slower as well as move closer together. Also, what happens when you remove heat from a liquid is the viscosity gets higher and it is more resistant to flow.

Question 22

How does adding heat to a gas affect the viscosity?

Answer 22

When you add heat to a gas, the particles in the gas start to move faster as well, as there are more collisions and rubbing between them. Also, what happens when you add heat to a liquid is the viscosity gets higher, and it is more resistant to flow.

Question 23

How does removing heat from a gas affect the viscosity?

Answer 23

When you remove heat from a gas, the particles in the gas start to move slower, as well as there are less collisions and rubbing between them. Also, what happens when you move heat from a gas is the viscosity gets lower and it is less visitant flow.

Question 24

What is density?

Answer 24

Density is described as the amount of mass contained in a given volume. A substance can have different densities, depending on its temperature.

Question 25

What is an example of density?

Answer 25

For example, if you were to go swimming in a lake on a hot summers day the surface of the water would be warmer than it would be if you were to dive below the surface, the warm water floats the top on the cooler water because it has a lower density than that of the cold water.

Question 26

How do you know if something will sink or float?

Answer 26

How you would know is when ever you attempt to make something float on something like a fluid if the thing you were trying to make slow has a higher density and what you were
putting it on but if it is the same or lower density than it will float.

Question 27

Why does ice float on water?

Answer 27

The reason that Ice floats on water and other solids do not is because water has its own density meaning there anything more than the density of water which is one then it is going to sink but since ice density level is less than water, it is able to float.

Question 28

How do you calculate for density?

Answer 28

Density is the ratio of mass to volume. The unit for measuring the density of liquid is usually grams per millilitre for gas is the most commonly used unit is kilograms per litre the unit for measuring the density of solids is grams per cubic meter. You can calculate the density of a substance by dividing its mass by its volume.

Question 29

What is buoyancy?

Answer 29

Buoyancy is the upward force that keeps things afloat in liquids.

Question 30

What is force?

Answer 30

A force is a push or pull that acts on an object.

Question 31

What is displacement?

Answer 31

Displacement is when an object is placed in something, and it makes moves for itself, and when they have an equal amount of volume.

Question 32

When will an object rise in a fluid?

Answer 32

This is when the density of the object is less than the density of the fluid and the buoyant force on the object is greater than the force of the gravity on the object.

Question 33

When will an object sink in a fluid?

Answer 33

An object will sink in a fluid when the density of the object is greater than the density of the fluid, or the buoyant force on the object is less than the force of gravity on the object.

Question 34

When will an object float and a fluid? 

Answer 34

An object will float in a fluid when the density of the object is equal to the density of the fluid, or the buoyant force on the object is equal to the force of gravity on the object.

Question 35

How does buoyancy work in fish?

Answer 35

For fish to be buoyant, it must displace less water or the same amount as water as its own body mass. This isn’t easy and an underwater environment where the density of the water changes with the depths in different kinds many fish use swim bladders to help them with quick depth changes. The bladders will fill up with air to help fish rice or release air so fish can sink.

Question 36

How are boats able to float even though the size and the weight?

Answer 36

The reason boats can stay afloat, no matter it’s size is because of the haul of the ship is wider and allows for maximum displacement of water, having the buoyancy force push the ship up, making it float.

Question 37

What is pressure?

Answer 37

Pressure is the amount of force applied to a given area.

Question 38

How can air pressure change?

Answer 38

The way that air pressure can change is depending on the altitude, so if you were on the top of the mountain, the air pressure is a lot lower because you were closer to the atmosphere and if you were at sea level, the air pressure is gonna be much higher.

Question 39

How is pressure affected by Depths?

Answer 39

For example, scuba divers must pay careful attention to the pressure levels when diving. As divers descend the volume of the air they breathe changes. The further down a diver descends into the water the greater the pressure is. Divers use a special, mixture of oxygen and nitrogen in their tanks.

Question 40

How is pressure affected by fluid flow?

Answer 40

For example, when you inflate a balloon, you’re actually putting gases in this case, mostly helium into an elastic container as you add more gas, the pressure inside, the balloon increases, and in response, the balloon expands if the balloon is released, it will go higher into the atmosphere where the air becomes thinner and the atmospheric pressure drops.

Question 41

How is pressure affected by temperature?

Answer 41

When the temperature is increased, the particle move faster and strike the walls of the contained more often and with more energy at a constant volume and increase in temperature results in an increase in pressure if the volume of the container cannot increase, its pressure increases, possibly resulting in an explosion.

Question 42

What is compression?

Answer 42

Compression is a decrease in volume caused by a force.

Question 43

What time it is an example of compression?

Answer 43

For example, when you kick a soccer ball, the force of your foot compresses the ball and temporarily deformed it this is the same of most sports equipment.

Question 44

Why are gases easier to compress than liquids?

Answer 44

The reason that it is easier to compressed gases between the particles the more space means it can be compressed into a smaller space.

Question 45

What is Pascal’s law?

Answer 45

Pascals law states that an enclosed fluid transmits pressure equally in all directions as a result of this discovery. Many different types of hydraulic and pneumatic devices were created.

Question 46

What are hydraulic systems?

Answer 46

A hydraulic system is a closed system, which means that the fluid is circulated through the system, and is not used up. The heart is an example of a hydraulic system. The heart acts as the pump the valves in the veins, as well as between the chambers in the heart, are the valves in the system, keeping the fluid flowing in one direction. The blood in the system is the hydraulic fluid.

Question 47

What are pneumatic systems?

Answer 47

A pneumatic system uses a gas, usually air under pressure to transmit a force in order for the gas to be put to work it must be compressed.

Question 48

Oil spills on water?

Answer 48

Oil is the most common pollutant of water more than 3,000,000 tons of oil pollute the earths water systems each year oil spills such as from tankers account for less than 10% of the total oil pollution much of the oil that pollute water comes from runoff and waste from large cities and industries.