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19 Cards in this Set

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Newton's 3rd Law
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
Action
Reaction forcxes don't cancel because they're acting on different objects
Momentum
inertia in motion

p=mv (vector)
related to Newton's 1st law
Units: kgm/s
Impulse
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
Follow through
makes force last koinger

^p=Ft
p= as big as possible
F= smae
t= more time on contact
Helmets and Air Bags
^p=Ft
p= same
F= smaller when time is longer (less)
t= longer with air bag
Law of Conservation Of Momentum
The total momentum of a system remains the same unless there's an outside net force
Pbefore=Pafter
Bouncing
bigger ^p than stopping
bounce is double the impulse
Momentum concentration
Car collision example:
Work
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
Energy
ability to don work (E)
calculated in J
J
Joules
Types of Energy
mechanical
light
heat
sound
electromagnetic
ect...
Mechanical Energy
Potential energy (PE) energy due to position

Kinetic Energy (KE) energy due to motion

PE Wdone to put the onject there
Power
Rate of doing work, transferring energy

P=W/t=E/t

J/s= W (watts)
W
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
Power
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
Arbitraru Zero
ground level
path independent
Kinetic Energy
KE= work needed to get up to speed v= (fd)
KE= 1/2mv2