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Chapter 1: Vectors
Fn= cos
Fp=sin
as angle on incline gets larger, Fwt swings
further away from normal, Fp gets larger, Fn gets smaller
0 degrees: Fp=0 Fn=Fwt
45 degrees: Fp=Fn
90 degrees: Fn=0 Fp=Fwt
smaller angle: same force does more work
inertial reference point-person w/radar gun
standing on shore at point of landing
angle of departure--relative to bank or to
true path
Chapter 2: Parallel Forces
unbalanced force help by pivot-swings to find
equilbirium
rotational equilbirium-not rotating, balanced
torques in clockwise and counterclockwise directions
translation-moving in one plane
torque-what happens to off centered body causing
rotation T=F x D
Levers:
1st Class: Effort Pivot Load, wheel/axle,
effort pushes doen to life load, force of effort doesnt match load unless
pivot in dead center
maxium torque--great distance x small force = small distance x large force
effort less than load
moment = torque = resistance
2nd Class: Pivot, Load, Effort, wheelbarrow,
effort less than load
3rd Class: Pivot, Effort, Load, shovel, fishing
pole, effort more than load
line of action-line through force going for
infinity
axis of rotation-pivot
stable equilibrium-lowest possible center
of gravity
unstable-center of gravity outside original
base
neutral-center of gravity always in original
base (circular)
distribution of load-compressional force vs
support force, bridge
translational equilibrium- sum of force up=sum
of force down
Friction:
surface conditions dictate angle of movement
F=ma
kinetic friction, static friction, rolling
friction
opposite forces
incline, horizontal
instantaneous force--no acceleration (Fnet=Fk)
sustained force--acceleration
only find mewK at angle for constant speed
only find mewS as angle for just about to
move
Horizontal and Vertical Motion:
acceleration-uniform increase/decrease in
motion over a time
unifrom change in speed- increase acceleration
constant acceleration-adding same increment
to preexisitng speed