Term
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Definition
| Physical quantity that has magnitude but no direction |
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Term
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Definition
| Physical quantity with both magnitude and direction; can be represented by an arrow |
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Term
How do you add vectors? Subtract?
What about scalars with vectors? |
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Definition
-Place head of first to the tail of the second, then draw an arrow head to tail (resulting vector); magnitude of 2 vectors must be smaller than or equal to sum of result
-for subtract, flip one of the vectors (make it go in the negative direction) and do the same thing; must be greater than or equal to resulting difference vector
-Cannot add or subtract; but can multiply or divide by scalrs |
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Term
| How to multiply vector? Vector x scalar? |
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Definition
Vector x vector: result= perpendicular to both tails together; V1V2sintheta
Vector x scalar: V1V2costheta |
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Term
What are component vectors?
Easier way than SOHCAHTOA to find all magnitudes + angles? |
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Definition
Each vector can be a "hypotenuse" and have 2 perpendicular "x and y" components equal to it addition wise
O= Hsintheta
A=Hcostheta
Remember, theta is always between A and H |
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Term
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Definition
displacement= distance with added dimension of direction; it's a vector
basically the shortest "distance" from point A to Point B; distance= actual pathway |
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Term
Average Velocity
Instantaneous Velocity
Velocity can be either...
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Definition
Average velocity= displacement/time
Instantaneous velocity= velocity at any moment during the trip at a specific time
Can be either all verticle or all horizontal |
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Term
Acceleration
Are velocity and acceleration always in the same direction? |
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Definition
any change in velocity, in EITHER magnitude or direction
velocity and acceleration do not have to be in the same direction; e.g. ball thrown up-> peak, velocity= 0, but acc is still there |
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Term
| uniformly accelerated motion |
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Definition
| constant acceleration in terms of magnitude and direction (velocity changes at a constant rate) |
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Term
| displacement vs time graph (slope, line, area under the curve) |
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Definition
slope: instantaneous velocity at that time range
upward slope= positive velocity, downward= negative
under 0 line: velocity is going in the *negative direction*
Horizontal line= not moving (0 velocity)
curved line= changing velocity, thus acceleration
area beneath= no meaning
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Term
| velocity vs time (slope, line, area under the curve) |
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Definition
slope: instaneous acceleration at that specific time range
upward= positive acc; downward= negative acc (acceleration in the negative direction)
straight line= constant acc; curved= changing acc; flat line= no change in acc, constant velocity
area under: displacement |
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Term
| How to solve linear motion problems |
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Definition
-Draw line with initial and final velocity; center= average velocity **acc is constant
D= average vel * time
acc= time * (difference between the two velocities) |
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Term
| How to look at projectile motion problems |
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Definition
| Horizontal component seperate from verticle (both linear motion problems |
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Term
| Projectile motions: describe velocity in the beginning |
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Definition
| Angle "theta", initial velocity = vsintheta, horizontal velocity= vcostheta always |
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Term
Projectile motions: what happens at the peak? equation for peak height?
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Definition
height "h"= heighest since it's the peak; g= +10 m/s^2 (since there's now downward acceleration)
always; no verticle velocity
equation: vsintheta = sqroot(2gh) |
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Term
| In projectile motion: what determines time of flight? |
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Definition
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Term
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Definition
| this occurs when an object moves past a nonideal gas or liquid...fluid molecules drag past this object and act to impede the object's motions |
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