Term
| Momentum can be calculated by multiplying mass by ______ |
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Definition
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| If no net force acts on a body ____ |
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Definition
| the velocity of the body is decreasing |
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Term
| The greatest change in momentum will be produced by _______ |
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Definition
| a large force acting over a large time |
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| Impulse can be represented by _____ (formula) |
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Definition
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| When a large truck collides head on with a small car the force on the car is _____ the force on the truck. |
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When a large truck collides head on with a small car the impulse on the car is _____ the impulse on the truck.
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When a large truck collides head on with a small car the change of momentum on the car is _____ the change of momentum of the truck.
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When a large truck collides head on with a small car the acceleration of the car is _____ the acceleration the truck.
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Term
| An internal force ___ the total momentum of a system |
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Definition
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Term
| "There is no such thing as suction" What does he mean by that? |
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Definition
| It is actually just pressure. When the "suction" cup is pushed down, the air inside gets forced out and seals, which leads to the pressure in the space under the cup is now lower because there are less air particles in it. On the outside, there is a standard amount because there are more particles pushing down on the seal than in the contained space. It is just an issue in air pressure |
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Term
| A glass of water with ice floating in it is filled to the top. When the ice melts will the water overflow, go below, or stay the same? |
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Definition
| Stay the same. Since water and ice are the same material , it displaces the same amount of itself. When the ice melts, it will displace the same amount of water as it did when it was a solid |
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Term
| What if the ice had a rock frozen in it first? Whats happens then? |
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Definition
| The water level would go down because the rock displaces less water than the ice cube itself did. |
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Term
| What is Archimedes' Principle? |
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Definition
| The buoyant force of an object is equal to the weight of the liquid it displaces. |
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Term
| For a floating object the "amount" of water displaced is equal to the ____ of that object |
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Definition
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Term
For an object under water the "amount" of water displaced is equal to the ____ of that object
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Definition
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Term
| The electrostatic force between two charges located 1 meter apart is 10 N. What will be the force between there two charges when they are located 2 meters apart? |
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Definition
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Term
| A +2C charge and a -4C charge attract each other with 10 N of force. How much will a -2 C charge and an +8C charge attract each other when placed the same distance apart? |
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Definition
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Term
| In a good insulator, the charges are usually ______ |
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Definition
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Term
| Which method of charging involves direct contact between objects involved? |
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Definition
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Term
| Which method of charging does not require objects to ever come in contact? |
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Definition
| polarization and induction |
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Term
| Which method of charging doesnt actually cause the object to gain or lose charges (they remain neutral, but act like they are charged)? |
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Definition
| polarization and induction |
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Term
| Which method of charging occurs most of the time only with insulators? |
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Definition
| friction and polarization |
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Term
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Definition
| Ripping the tape off the table which rips the electrons off the table |
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Definition
| the pith ball being attracted to the balloon |
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Definition
| the water stream being attracted by the balloon |
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Definition
| the small circles of paper being attracted to the balloon and making contact and gaining an electron making the paper neutral, thus it falls onto the table and off the balloon |
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Term
| Difference between an insulator and conductor |
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Definition
| insulators do not allow electrons to flow easily through them like conductors do. conductors, or metals mostly, have free moving electrons, while insulators don't. this means that the outer shell of conductors, on the atomic level, are not full and have free moving electrons. |
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Term
| How many constellations are there? |
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Definition
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Term
| What is the Zodiac and why is it special |
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Definition
| The Zodiac are the 12(13) special constellations that are special because they make up the apparent path of the Sun, moon, and planets across the celestial sphere over the course of the year. |
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Term
| What is the other name for the North Star |
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Definition
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Term
| How many stars can you see with the naked eye if it was totally dark? Why would it help if it was totally dark? |
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Definition
| 5,000. It helps because there wouldnt be any excess light that would block out any stars |
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Term
| What is retrograde motion? |
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Definition
| It refers to the path planets take in the sky. If a planet is retrograding, then it appears to be moving backward. |
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Term
| How did Ptolemy explain retrograde motion? |
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Definition
| [image]He explained it by using epicycles, he used Jupiter and said that as it traveled around earth, it also travels in a circle on it's orbit |
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Term
| How does Copernicus explain retrograde motion for Mercury and Venus? |
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Definition
Mercury and Venus orbit the Sun with
orbits smaller than Earth’s.
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Term
| What is the "Problem of Parallax" |
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Definition
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Term
| Which two cosmologies have it as a problem and why would they? What is Copernicus' answer to it? |
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Definition
| Aristarchus and Copernicus do because they believe in helio-centric models. Copernicus answers the problem of parallax by assuming that the universe is very large, perhaps even infinite, so we can not see it, although its taking place. |
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Term
| What is an eccentric? Who uses it? |
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Definition
| Ptolmey. He thought everything orbited the earth, but the earth was not the center of the orbit so he used eccentrics to explain it. |
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Term
| 3 things Galileo saw through his telescope |
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Definition
1. Moons of Jupiter- proved that things revolve around other things than the Sun
2. Craters on the Moon- the moon isnt a perfect spherical model, yet has marias (seas) and craters
3. Sunspots - proves the sun has imperfections and sun spots that generate radiation |
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Term
| Two interesting things about Tycho Brahe |
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Definition
1. Lost his nose in a duel
2. Tycho Brahe made a remarkable star catalogue of over 1000 stars. This was not the biggest catalogue in the number of stars, but in accuracy. His improvements of methods and accuracy in observations was very significant. |
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Term
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Definition
1. Law of Ellipses
2. Law of Equal Areas
3. The Law of Harmony |
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Term
| What does the Big Bang Theory say about the beginnings of the universe? How old is it? |
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Definition
| It was created from nothing and space kept expanding at an incredibly fast pace. about 14 billions years |
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Term
| How can we tell the universe is expanding? |
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Definition
No matter where you look in the sky, nearly all galaxies are moving away from us, therefore the farther away a given galaxy is, the faster it is moving away
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Term
| 2 pieces of evidence that support the Big Bang Theory |
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Definition
1. The dark night sky
2. Evolution of stars, galaxies, etc. |
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Term
| Frozen Frictionless Pond question |
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Definition
In a closed system, the total momentum of the system is conserved. The system is you and the rock. Before you throw the rock, everything has a momentum of zero. After you throw the rock, due to the conservation of momentum, your total momentum will still be zero despite the fact that you now have greater velocity in the opposite direction of the rock. You will get off the pond, but the total momentum of the system will still be zero. But if you multiply the mass by the velocity of the rock & add it to the mv of you, it will equal zero
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Definition
| cant be created nor destroyed (only change forms) |
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Definition
| the total energy remains the same throughout a system |
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Definition
the pressure is transmitted evenly through a liquid. That's why when you inflate a balloon with air, it expands evenly in all directions
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