Study sets, textbooks, questions
Upgrade to remove ads
11.1 y 11.2
8th Grade Science
Terms in this set (20)
what is pressure
force exerted over a surface
what is force
a push or a pull
what is the formula for pressure
p = force/area
what is the SI unit for pressure
pascal or Pa (which is N/m2)
what is a fluid
a substance that can flow (liquids and gases)
what causes fluid pressure
the movement of the particles causing them to hit each other and to hit any surfaces around them. by colliding with each other they are applying a force to each other or to the surface they hit. the particles are moving in all directions and, therefore, are applying force in all directions. the tiny force that each particle exerts can be added to the forces of all the other particles in the fluid.
what is atmospheric pressure
it is the air pressure of the atmosphere. the gases of the atmosphere press down toward the earths surface. the weight of the air is the force that produces the air pressure.
explain balanced pressure
the pressure is exerted in all directions from all directions, so its balanced.
what happens to atmospheric pressure as elevation increases
as elevation increases, atmospheric pressure decreases.
what happens to water pressure as depth increases
as depth increases, water pressure also increases.
what instrument do you use to measure pressure
how are force and pressure alike
they both incorporate a push or a pull. a force is the push or the pull exerted on an object. pressure is that same push or pull spread over the surface area. also, they can both cause damage.
how are force and pressure different
force: f=ma; measured in N; changes with mass. pressure: f/a; measured in Pa (=N/m2); changes with surface area.
what is another name for the force of gravity on an object
what is buoyant force
the upward force exerted by fluids on an object. it acts in direction opposite gravity so objects feel lighter.
what is buoyancy
the ability to float
what is archimedes principle
states that the buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces
using archimedes principle, explain how a ship floats
if more water is displaced by the ship, then the ship has more buoyant force. and the larger the surface area of the object, the more buoyant force the object has (because the large object displaces more water than a smaller object). as long as the buoyant force is equal to the weight, then the ship will float. the ship has a large area which is partially filled with air. since air has less mass than an equal volume of water, the overall density of the ship is decreased.
what is density
mass per unit volume. it is how tightly packed the mass is within the space.
what is the formula for density
Sets with similar terms
Science 8: Pressure
8th Grade Forces in Fluid; Chapter 3, Test set
Pressure, Buoyancy, Floating, Sinking
Other sets by this creator
Ch. 13 ASIA
Science- Ch 7