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19 Cards in this Set
- Front
- Back
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Newton's 3rd Law
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For every action, there is an equal and opposite reaction- If Object A pushes on Object B, Object B pushes back on object A with an equal and opposite force
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Action
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Reaction forcxes don't cancel because they're acting on different objects
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Momentum
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inertia in motion
p=mv (vector) related to Newton's 1st law Units: kgm/s |
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Impulse
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change in momentum
I=^P=Ft ^= change in Related to Newton's 2nd Law: A= F/M ^v/t=F/m m^v=ft ^p=Ft |
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Follow through
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makes force last koinger
^p=Ft p= as big as possible F= smae t= more time on contact |
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Helmets and Air Bags
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^p=Ft
p= same F= smaller when time is longer (less) t= longer with air bag |
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Law of Conservation Of Momentum
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The total momentum of a system remains the same unless there's an outside net force
Pbefore=Pafter |
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Bouncing
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bigger ^p than stopping
bounce is double the impulse |
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Momentum concentration
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Car collision example:
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Work
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How energy is transfered (how an object gains or loses energy)
W=F,,d W= work ,,= parallel d= distance in direction of motion circular definition with energy Lift 1N object 1m high W= (1N)(1m)= 1J Nm= J J = joules |
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Energy
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ability to don work (E)
calculated in J |
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J
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Joules
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Types of Energy
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mechanical
light heat sound electromagnetic ect... |
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Mechanical Energy
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Potential energy (PE) energy due to position
Kinetic Energy (KE) energy due to motion PE Wdone to put the onject there |
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Power
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Rate of doing work, transferring energy
P=W/t=E/t J/s= W (watts) |
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W
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Watts
60 W lighhtbult take 60 J of electric E and turnsd it into 60J of light and heat every second 1 W= doing 1 J of work every 1 second |
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Power
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walking up stairs vs. running up stairs
same enrgy (same work to lift body to same height) More POWER to run up PEgrav= work required to lift object to that height =Fgravd = (mg)(h) PEgrav= mgh |
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Arbitraru Zero
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ground level
path independent |
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Kinetic Energy
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KE= work needed to get up to speed v= (fd)
KE= 1/2mv2 |
