Physics 1 Flashcards
sin(theta)
opp/hyp
cos(theta)
adj/hyp
unit vector
special vector with magnitude of 1
i^
x-axis
j^
y-axis
|A vector|
sqrt( (Ax)^2 + (Ay)^2 )
A vector * B vector
|A vector||B vector|cos(theta)
i^ * j^
0
(A vector) * (B vector)
(Ax * Bx) + (Ay * By)
______ components survive the dot product
parallel
______ components survive the cross product
perpendicular
Express Ax in terms of theta
Ax = Acos(theta)
Express Ax in terms of phi
Ax = Asin(theta)
Force
influence that has the potential to change an objects motion
What is Gravity
non-contact force
Normal Forces
always perpendicular to surfaces producing them
Types of forces
Gravity, normal(support), friction, tension, applied forces
Friction is always _____ to the surface
parallel
Tension always _____ the rope
follows
g=_____
acceleration due to gravity, 9.81 m/s^2
Fg=____
m * g
Newtons 1st Law of Motion
In the absence of a net external force, an object in motion stays constant
Newtons 2ns Law of Motion (discrete)
Sigma F vector = m * acceleration vector
Newtons 2ns Law of Motion
Sigma F vector = m * acceleration vector
Newtons 2ns Law of Motion (continous)
Integral F vector = m * acceleration vector
What is acceleration
Change in objects motion (speeding up/down or turning)
Coupled Systems
2 or more objects are able to influence the motion of the others, they have the same acceleration
Work =
F1 * delta X ; (1/2)KX^2
Spring Force
Fs = -K * delta X ; Restorative
Joule
J = N * m = kg * (m/s)^2 = mv^2
Energy in =
+
Energy out =
-
Power
(delta W / delta t) / (delta E / delta t) / (J / s) = W(watt)
Gravity and Spring forces are…
conservative forces
conservative forces
work done by or against conservative forces do not depend on the actual path, but only the endpoint
ug
mg * delta y
us
1/2 kx^2
ki + ui + Wnc
kf + uf
Law of conservation of Energy
Energy cannot be created nor destroyed but it can change forms
Potential Energy
u
W =
delta u (only true IF the force doing the work is conservative
