Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
HELUS8Ch3
Physical Science: 8th Grade: Chapter 3
| Question | Answer |
|---|---|
| ____ is the amount of mass per unit volume of a material. | Density |
| The equation for density is: ____/volume | mass |
| If you know any two values in the density equation, you can calculate the third value. For example, if you know an object’s mass and density, you can calculate the object’s ___. | volume |
| Density depends on the ___ of which an object is made, not the size of the object. | material |
| The density of a material depends on the ___ of the particles (such as atoms or molecules) that make up the material. | mass |
| The more massive the particles, the ___ the density of the material. | higher |
| The density of a material depends on the ___ between the particles in the material. | distance |
| The farther apart the particles, the ___ the density of the material. | lower |
| Because the distance between particles of a gas increases as the gas is heated, the density of a gas ___ as it is heated. | decreases |
| The density of a gas changes greatly as its ___ changes. | temperature |
| To measure the density of an object, you first need to measure both its mass and its ___. | volume |
| The mass of an object can be measured with a ___. | balance |
| To measure the mass of a substance that requires a container, subtract the mass of the ___ ___ from the total mass. | empty container |
| The volume of a liquid can be measured with a ___ ___. | graduated cylinder |
| A ___ ___ is a six-faced block in which all faces are rectangular. | rectangular solid |
| The volume of a rectangular solid is equal to its length multiplied by its width multiplied by its ___. | height |
| For an object with an irregular shape, one way to measure its volume is to place it in aliquid and measure the volume of liquid the object ___, or pushes aside. | displaces |
| Once you have measured the mass and volume of an object or material, you can calculate its ___ by dividing its mass by its volume. | density |
| Density is a physical property, which means that you can measure it without changing the___ of the material whose density is being measured. | composition |
| A ___ is a material that can flow and has no definite shape. | fluid |
| ___ and gases are fluids. | Liquids |
| Fluids can exert ___. | forces |
| ___ is the force per unit of area applied on the surface of an object. | Pressure |
| Pressure depends on the area over which a force is exerted. If the area increases, thepressure ___. | decreases |
| Pressure depends on the size of the force. When ___ increases, pressure also increases. | force |
| The equation for pressure is P = force/_____ | area |
| The SI unit of pressure is the ___, abbreviated Pa. | pascal |
| A pressure of 1 Pa is equal to a force of1 N applied over an ___ of 1 m2 | area |
| For any liquid in a container of any shape, the pressure depends only on the height of the ___ of liquid above the surface where you measure the pressure. | column |
| The deeper underwater you go, the ___ the pressure is on you. | greater |
| Pressure increases with depth because as you go deeper, the column of water above you gets ___. | taller |
| In a fluid, pressure is exerted on all points on the outside of an object in a direction ___ to the surface of the object at that point. | perpendicular |
| A gas, like any ___, exerts pressure on an object. | fluid |
| Pressure depends on the ___ of thegas above the object. | height |
| ___ ___ is the force exerted per unit area by air particles. | Atmospheric pressure |
| As you climb, or increase your elevation, atmospheric pressure ___. | decreases |
| Atmospheric pressure at sea level is caused by a large weight of gas, but is difficult to notice because there is an equal, ___ pressure pushing out from the inside of your body. | internal |
| The ___ ___ is the net upward force exerted on an object in a fluid by the surrounding fluid. | buoyant force |
| In a fluid, there is no net ___ force on an object caused by pressure from the fluid. | horizontal |
| Because in a fluid, pressure increases with depth, the force of the fluid pushing up on the bottom of an object is always ___ than the force of the fluid pushing down on the top of the same object. | greater |
| The size of the ___ force does not depend on depth. | buoyant |
| ___ ___ states that the buoyant force on an object is equal to the weight of the fluid the object displaces. | Archimedes’ principle |
| Whether an object sinks or floats depends on the relative size of the buoyant force on theobject and the ___ of the object. | weight |
| If the buoyant force on an object is less than the object’s weight, the net force on the object is ___ and the object will accelerate downward, or sink. | downward |
| When an object is ___, it is not accelerating vertically, which means that the upward (or buoyant) force and the downward forces on it are the same. | floating |
| An object will float if it is less dense than the ___ around it. | fluid |
| Metal boats float because they contain ___, which makes their total density less than the water around them. | air |
| A ___ is an instrument that measures the density of a fluid. | hydrometer |
| In a less dense fluid, a hydrometer displaces more fluid and floats ___ than in a denser fluid. | lower |
| In a denser fluid, a hydrometer displaces less fluid and floats ___. | higher |
| Like any fluid, air exerts ___ on things around it. | pressure |
| If the buoyant force due to air pressure on an object is large enough, the object can ___ in air. | float |
| Helium gas is ___ dense than nitrogen gas and oxygen gas, which are the main components of air. | less |
| When a balloon is filled with helium, it is less dense than the air around it, and so the balloon ___. | floats |
| Whether a hot-air balloon rises or falls can be controlled by changing the density of the ___ inside the balloon. | air |
| Using a burner to heat the air in a hot-air balloon causes those air molecules to move___ ___ from each other, so that air becomes less dense than the air around theballoon. | farther apart |
| When the air in a hot-air balloon ___, it becomes as dense as the air around the balloon. The total density of the hot-air balloon is then greater than the air around it, and the balloon sinks. | cools |
Created by:
jnosik
Popular Science sets