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31 Cards in this Set
- Front
- Back
____ - a quantity we can describe with one number, has magnitude ex. ____
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Scalar
Mass and energy |
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____ - a quantity that requires two numbers, has magnitude and direction ex. ____
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Vector
Force and momentum |
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Can represent a ____ as an arrow where the direction of the ____ is the direction of the arrow, the length of the arrow is the ____ of the ____.
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vector
vector magnitude vector |
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5 steps for physics problems!
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1. Confidence
2. Diagram 3. System 4. Formula 5. Plug and chug |
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Can only add scalars to ____ and vectors to ____.
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scalars
vectors |
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Multiply a scalar times a vector - changes the ____ w/o changing the ____.
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length
direction |
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To add vectors place the head of one and place it at the ____ of the other. The resulting ____ or the ____ is drawn from the tail of the first vector to the ____ of the second vector.
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tail
force vector net vector head |
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Reversing the direction of the vector makes it ____ (for ____ etc)
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negative
subtraction |
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Dot product = ____ (force times displacement = scalar work)
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product of the magnitude of two vectors times cosine of angle between them
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Cross product = ____ (force times displacement = vector torque)
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magnitude of the vector product is equal to the product of the two vectors times the sine of the angle between them
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____ are - two vectors that are 90 degrees to each other and whose sum is equal to the original vector
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Components
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Notice that the two components always form a ____ with their vector sum
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right triangle
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SOH CAH TOA
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Sine
Cosine Tangent |
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Can replace the vector with ____ -
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components
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____ - total number of steps to get somewhere (a ____)
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Distance
scalar |
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____ - how far you are from where you started (a ____)
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Displacement
vector |
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____ = distance/time (a ____)
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Speed
scalar |
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____ = displacement/time (a ____)
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Velocity
vector |
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____= Δvelocity/time
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Acceleration
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55mph squared = ____
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a change in velocity of 55 mph every hour, therefore would take 1 hour to accelerate from 0 to 55 mph
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Assume for mcat Gravitational constant, ____
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g = 10 m/s2
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So for g each second velocity changes by ____, after 1 second it is moving ____ after 2 seconds it is ____ etc
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10 m/s
10 m/s 20 m/s |
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Throw an object at 30 m/s, so velocity drops every second so ____ seconds to reach peak
Throw it up at 50 m/s how long to come back and hit the ground, ____ second up and ____ down so ____ seconds |
3 seconds
5 5 10 |
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3 uniform accelerated formulas you should memorize:
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X = X0 + (V0)T +1/2aT^2
V^2 = V0^2 +2ax v= v0 +at |
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How long to drop 180m?
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X=X0 + (V0)T +1/2aT^2
X0 and V0 are 0, and then X = 1/2aT^2 So solve and therefore x = 6 seconds |
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Distance travelled is the _____ times the time, when acceleration is constant _____ is the _____ times the ____ divided by ____.
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average velocity
average velocity initial velocity final velocity two |
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Drop something out of a plane, how far has it fallen after 4 seconds?
How far does it travel in the second and third seconds? |
(40 m/s + 0 m/s )/2 = 20 m/s *4 seconds = 80 m
After 1st second velocity = 10 m/s and after 3rd = 30 m/s so average is 20 m/s 20*2 = 40m |
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As long as there is no air resistance the flight is not affected by ____ or ____, so with no air resistance one could throw a feather as far as a baseball
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mass
shape |
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Air resistance is caused by the projectile crashing into ____, the more ____ hit per second the greater the air resistance so surface ____, ____, and ____ all affect air resistance
Different mass - respond to ____ differently such as more inertia = slows down less etc. |
air molecules
air molecules area shape velocity air resistance |
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____, for vertical velocity only and can only use it when initial or final velocity is 0
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V = sqrt(2gh)
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Projectile shot at 100 m/s at 30 degrees from the ground.
First separate vertical from horizontal - the initial vertical velocity is ____ So know ___ seconds up and ____ seconds down so ____ seconds in the air And then know ____ = max height Range = horizontal distance traveled is constant ____ |
100sin30 = 50 m/s
5 5 10 50/2 = 25 25m/s so 25 m/s *5 = 125m 100cos30 = 87 m/s, so 870m |