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65 Cards in this Set
- Front
- Back
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Order the following from lowest pressure tohighest pressure: 1 snowboard, 1 ski, 1 mattress, 1 needle, 1 knife (assumingall objects have the same force |
Mattress, snowboard, ski, knife, needle |
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If the density of an object is 11.36 g/cm3 andthe volume is 32.8 cm3, what is the mass? |
372.61 g |
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Why do hot air balloons float? |
The hot air balloon is less dense than thesurrounding environment. Will rise until the density reaches the same as it isoutside. Hot air is less dense than the cold air outside (that’s why you alwaysgo in the morning)· Like an air bubble in water |
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If there is a closed hydraulic system with aforce of 10 lbs and an area of 2 in2, what is the force on the other side if ithas an area of 5 in2? |
25 lbs |
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If the earth moved away from the sun past Jupiterand still orbited the sun, what would happen to the length of a year? |
It would drastically increase |
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It two objects collided with on another , whatconservation principle does this demonstrate? |
Conservation of linear momentum |
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What conservation principle does electricalshock demonstrate? |
Conservation of charge |
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If you make juice, what conservation law doesthis demonstrate? |
Conservation of mass |
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If I push on a rock with 5N (Newtons) force andit moved parallel 2m, how much work did I do? |
10 Nm = 10 J |
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If a ball is going 5 mph and it has a mass of 2kg. What will have more kinetic energy – a ball with a speed of 10 mph and amass of 2 kg, or a ball with a speed of 5 mph and 6 kg |
The first ball |
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If a pendulum has a PE of 10 J and a heightabove the ground of 5 m, what is its maximum speed? |
10 m/s |
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What is the height of a rock with a potentialenergy of 100 J and mass of 6 kg? |
H = 1.7 m |
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How can you increase the potential energy of: A trampoline spring A pogo stick spring Two like charges Two opposite charges |
Stretch it Condense it Put them close together Pull them apart |
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When is the total energy of the pendulumgreatest? |
Trick question -- remains constant |
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If there was a closed hydraulic system, and one side had a surface area of 100 in2 and the other side had a surface area of 10 in2. What would be the output force on the large end (100 in2) if the small end (10 in2) was pushed with a force of 10 pounds? |
100 pounds |
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If there were two balls completely submerged in water called ball Q and ball P. If the balls had the same mass, and ball Q had a volume larger than ball P, what do you know about the gravitational and buoyant forces? |
The gravitational force is the same for both balls and the buoyant force is greater for ball Q than ball P. |
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T or F Pressure only depends on the surface area of the fluid and does not depend on the depth. |
False |
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Where would you expect the air pressure due to our atmosphere to be largest here on Earth? |
Sea level |
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T or F If you had three fluids A, B, and C. One way to determine the relative densities of fluids A, B, and C is to mix them together. Over time the most dense fluid will rise to the top, and the least dense fluid will sink to the bottom. |
False |
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T or F Special Relativity only works when all objects are not accelerating. |
True |
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T or F According to special relativity no information can go faster than the speed of light. That means if the Sun disappeared the people on Earth would not know it was gone for about 8 min and 20 sec. |
True |
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If someone was traveling close to the speed of light in a spaceship and the had a stick that was one meter long pointed in the same direction as the spaceship was traveling. What would an outside observer say about the meter stick? |
The stick is shorter than one meter |
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If someone was traveling close to the speed of light in a spaceship and the had a clock that was started and stopped after 10 seconds. While the clock was ticking an outside observer started and stopped at the same time. What would an outside observer say about the measured time? |
The outside observer would say the time was greater than 10 sec. |
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Pressure formula |
Pressure = Force/area |
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What does pressure depend on? What does it not depend on? |
Pressure depends on depth Also depends on surface area (bed of nails) Does NOT depend on width or direction |
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Where is pressure greater and less? |
There is higher pressure at the bottom of the sea than on the top of a mountain |
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What is the difference in pressure between a pipe and dam? |
Greater pressure at the bottom of the long pipe than at the bottom of a wide but shallow dam |
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Does pressure differ for objects at the same depth? |
No |
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Pressure is always ______________ to the surface of a submerged object |
Perpendicular |
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How can you calculate the output force for a closed hydraulic system if I tell you the input force, and surface area of both sides? |
P(large) = P(small), so… F(large) = F(small) A(large) A(small) |
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What do we know about the pressure due to the atmosphere here on Earth? |
Pressure is highest at sea level (or under the sea), and lower the higher up you go. So Mount Everest would have the lowest pressure. Think of water bottle with holes leaking example. |
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What if you had two balls with the same masses but different volumes? What would be their gravitational and buoyant force? |
Gravitation forces are the same and the ball with greater volume has greater buoyancy. |
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What if you had two balls with different masses but the same volume? What would be their gravitational and buoyant force? |
Buoyancy forces are the same and the ball with greater mass will have greater gravitational force |
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Mass changes _______________ force, volume changes ______________ force |
Gravitational, buoyant |
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Density equation |
Density = mass/volume |
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Density of the ball is ____________ than the density of water when sinking |
greater |
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Density of the ball is _______ than the density of water when floating |
less |
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What is the fastest information can travel in the universe? |
Speed of light |
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How does an outside observer measure your time when you are going really fast (close to the speed of light)? |
Time slows down for you inside the spaceship, so an outside observer will measure time as much faster |
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How does an outside observer measure your length when you are going really fast (close to the speed of light)? |
Length is longer on the inside, so an outside observer will see a stick as shorter |
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If you are not accelerating is there anyway to tell if you are moving? |
You cannot tell the difference between moving at a constant speed and standing still. You have to change your relativity to see if you are actually moving |
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What did the Michelson Morley teach us about light? |
Speed of light (C) only knows how to go the speed of light. Ex: C + 10 mph = C |
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Describe conservation of energy |
start energy = final energy |
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Describe conservation of mass |
starting mass = ending mass + byproducts |
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Describe conservation of angular momentum |
Spinning things want to keep spinning. Mass x Velocity x Radius (MVRstart=MVRfinal) If you make the radius smaller, the mass doesn’t change, but the velocity will increase. |
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Describe conservation of linear momentum |
starting (MV)a + starting (MV)b = final (MV)a + final (MV)b |
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Describe conservation of charge |
You don’t make charge, just move it |
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Describe conservation of atomic mass number |
Both sides of a chemical equation must equal each other in protons and neutrons |
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Name 3 examples of conservation of mass |
Cookie dough = cookies + steam Iron can = iron can + rust produced Carbon cycle |
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Name 2 examples of conservation of angular momentum |
Spinning top Bike tire |
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Name 2 examples of conservation of linear momentum |
Billiards Car collision |
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Name an example of conservation of charge |
Static charge When you get zapped by a door knob, that’s the static shock neutralizing |
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When it comes to gravity, kinetic energy depends more on _________ than on _________. |
Speed, mass |
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Potential energy formula |
PE = mass x gravitational force x height |
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Kinetic energy formula |
KE = ½ mass x velocity2 |
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If a ball is at the top of a hill, how do you increase potential energy? |
Increase height |
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As far as charges go, how do you increase potential energy? |
Put like charges closer together |
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What is work in physics? |
Work = amount of force applied to an object X distance traveled parallel to applied force |
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How is kinetic energy and potential energy related for the pendulum? |
Kinetic energy at bottom is equal to potential energy at the top. |
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Describe convection |
Movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat |
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Describe conduction |
Process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material |
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Describe radiation |
Energy being transferred via waves or rays |
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Name a few examples of convection |
Lava lamp, green house, placing wet clothes over a heater to get them to dry faster |
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Name a few examples of conduction |
cast iron skillet conducts heat, aka gets hot, when placed on a stove burner, or placing your towel on a towel warmer |
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Name a few examples of radiation |
Laying out to get a tan, putting cold hands near the fire to warm them up |
