Save
or

or

taken

why

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.

focusNode
Didn't know it?
click below

Knew it?
click below
Don't know
Remaining cards (0)
Know
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

# Science: Pressure

### FMG: Perone's pressure, atmosphere, pascal, buoyancy, Archimedes' principle, etc

Define pressure. It refers to a force pushing on a surface. It exists when two objects are in contact with each other.
What is the formula for pressure? Force/Area This is measured in Pa (pascals), or if the area is in centimeters; N/cm^2
Define pascal. One newton per square meter.
True or False: more area = less pressure True. More area will distribute pressure throughout the object, therefore exerting less pressure.
Define fluid. substance that can easily flow, like liquids and gases. They exert pressure against the surfaces as they touch, when its molecules constantly collide with them. The forces exerted by each molecule in a fluid make up the pressure entered by the fluid.
What is fluid pressure? the total force entered by a the fluid divided by the area over which the force is exerted.
What is the atmospheric pressure? 14.7 pounds.
Why can't we feel the atmospheric pressure? The fluids in us, like blood and water, exert pressure against it, balancing it.
What is the relationship between pressure and elevation? Air pressure decreases as elevation increase.
Stuff about pressure and elevation At higher elevations, there is less air, which results in less air weight, which finally means that there is less air pressure. Your body adjusts to lower pressure when your ears pop, for example, so the pressures can be balanced.
What is the relationship between pressure and depth? Water pressure increases as depth increase.
Why does depth affect pressure? The weight of the water is on you, and the air pushes down on the water, increasing the pressure.
What is the buoyant force? the force that water exerts that acts on a submerged object It's equal to the displaced fluid. It increases if the places fluid does.
Which way does the buoyant force act? Upwards, against the force of gravity, making the object feel lighter.
How can you use buoyancy to determine whether an object will sink or not? Greater or equal buoyancy than gravity results in it floating. Greater gravity than buoyancy results in the object sinking.
What is Archimedes' principle? the buoyant force on an object is equal to the weight of the fluid displaced by the object. If the weight of the object is greater than its buoyant force, the object will sink.
A steel ball has a weight of 10 pound. The buoyant force acting on it is 3 N. Will it float or sink? It will sink. The ball's weight is greater than its buoyant force.
What is the formula for density? density = mass/volume
How can densities affect an object's ability to float or sink? If the object's density is greater than the fluid's density, it will sink. If the object's density is less than the fluid's density, it will float.
Why does a helium-filled balloon float? Helium is less dense than air,
What is Bernoulli's principle? pressure exerted by a moving stream of fluid is less than the pressure of the surrounding fluid.
Bernoulli's principle on airplane wings Air that is moving on the top of the wing has less pressure than the bottom of the wing, according to the principle. Because of this, the top air moves faster, causing a difference in pressure. This creates an upward force on the wing, called lift.

Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

• SPACEBAR - flip the current card
• LEFT ARROW - move card to the Don't know pile
• RIGHT ARROW - move card to Know pile
• BACKSPACE - undo the previous action

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

# Pass complete!

 "Know" box contains: Time elapsed: Retries:
restart all cards