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
Science Exam Reveiw
| Term | Definition |
|---|---|
| Fluid | Any material that can flow and takes the shape of its container |
| All fluids exert _______ | Pressure |
| Fluids can also be _____ | Gases |
| Pressure | The amount of force exerted on a given area |
| Pressure = (math) | Force / area |
| SI Unit for pressure | pascal (Pa) |
| Atmospheric | The layer of nitrogen, oxygen and other gases that surround the earth |
| Atmospheric Pressure | The pressure caused by the weight of the atmosphere |
| There are __N (_lbs) of pressure on every ______ _________ of your body | 10N (2lbs); square centimeter |
| Which direction do the fluids in your body exert pressure in? | The fluids exert pressure outward |
| How far does the Earth's atmosphere stretch? | About 150km above the Earth |
| __% of the Earth's gases are found within the first __km of the atmosphere | 80%; 10km |
| At the top of the atmosphere pressure is almost ___________, pressure is close to _Pa | nonexistent; 0Pa |
| Water pressure _________ as depth _________ | Increases; increases |
| Pressure depends on the _____ not on the total amount of fluid | Depth |
| Water is 1000 times more _____ than air | Dense |
| Density | The amount of matter in a given volume |
| Fluids flow from areas of ____ pressure to areas of ___ preessure | High pressure; low pressure |
| Buoyant Force | The upward force that fluids exert on all matter |
| Pressure _________ as depth _________ | Increases; increases |
| Water exerts a ___ ______ force (buoyant force) | Net upward |
| Archimedes was... | Greek mathematician in the 3rd century |
| Archimedes Principle | States that buoyant force on an object in a fluid is an upward force equal to the weight of the fluid that the object takes the place of or displaces |
| An object will ____ if its weight is greater than the buoyant force | Sink |
| An object will _____ if the buoyant force on the object is equal or more than equal to the objects weight | Float |
| Floating and Sinking Density = (math) | 1m = 1cm cubed - 5L of water = 5000cm cubed |
| Density = (math) | Mass / volume |
| FInd the density of a rock that has a mass of 10g and a volume of 2cm cubed | 5gcm cubed |
| How does a ship made of steel float if steel is denser than water? | - Ships are built with a hollow shape - Same amount of steel bu the hollow shape increases the volume of the ship - Overall density is less than the density of the water |
| Why are ships built to displace more water than needed? | Bc there are people and luggage on the boat (extra weight other than the ship) |
| What are ballast tanks and what do they do? | - Tanks in a submarine that allow it to float/sink - When they open water flows in, making it its mass increase (volume stays the same) - When closed, they pump air in, making it less dense (allowing it to float) |
| What is a swim bladder and what does it do? | - Swim bladder on a fish - It fills with gases (increasing volume, decreasing overall density) - It keeps the fish from sinking |
| Daniel Bernoulli | Swiss mathematician in the 18th century |
| Bernoulli Principle | States that as the speed of a moving liquid increases, the fluid pressure decreases |
| How do planes fly? | Fast moving air above the wing exerts less pressure than slow moving air below the wing |
| The speed of a plane is mostly determined by its: | Thrust and Larger thrust |
| Thrust | Forward force that produces by the planes engine |
| Larger Thrust | Increases speed, air travels around the wing at a higher speed which increases lift |
| Drag | A force that opposes or restricts motion in a fluid |
| Turbulence | An irregular or unpredictable flow of fluids |
| How do you determine the speed of air crafts? | Calculate the drag in combination with thrust |
| ____ is often reduced when turbulence causes drag | Lift |
| Planes use their flaps to change the shape of the area of the wing to reduce ____ and increase ____ | Reduce drag; increases lift |
| Blaise Pascal | French scientist in the 17th century |
| Pascal Principle | States that a change in pressure in an enclosed fluid will be transmitted equally to all parts of that fluid |
| Work | A force that causes an object to move in the direction of the force |
| For work to be done on an object, the object must move in the ____ direction as the force | Same direction |
| Work = (math) | Force x Distance |
| Power | The rate at which energy is transferred |
| Power = (math) | Work / Time = Joules |
| Power measures what? | How fast work happens or how quickly energy is transferred |
| Increase work, _________ power | Increase |
| Decrease work, ________ power | Decrease |
| Machine | A device that makes work easier by changing the size ro direction of a force |
| Work is done when a force is applied through a ________ | Distance |
| Work input | The work you do on a machine |
| Work output | Work done by the machine on an object |
Created by:
madisonradd
Popular Physical Science sets