Studied by 9 people
Vectors have:
magnitude and direction
Velocity and Speed
Are not equal
Units of acceleration
meters per second squared
displacement
the distance moved in a particular direction (s)
velocity
the rate of change of displacement (v)
speed
the rate of change of distance (s)
acceleration
the rate of change of velocity (a)
In the constant acceleration equations, "u" is
u is initial velocity
In the constant acceleration equations, "v" is
v is final velocity
In the constant acceleration equations, "a" is
a is acceleration
In the constant acceleration equations, "t" is
t is time
In the constant acceleration equations, "s" is
s is distance
Hookes Law
F = kx
What is the first step to solving a Force problem?
Draw a force diagram
When working out a problem about the acceleration of a block down a slope, how does one find the component of force that causes the block to move down the slope?
Fdownslope = mgsinθ = wsinθ, where w is weight
When working out a problem about forces on a block on a slope, what is the angle?
The angle used in the equation is the same as the angle of the slope against the horizontal
Newton's First Law
a resultant force causes acceleration, no resultant force causes no resultant acceleration
Newtons Second Law
F = ma
Equilibrium
∑F = zero
Newton's Third Law
for every action on one object there is an equal but opposite reaction on the other object
Conservation of Momentum
linear momentum is conserved if there is no resultant external force
Work is only done
in the direction of the force
amount of energy transfered =
amount of work done
Energy is in the unit of
Joules
Work is in the unit of
Joules
Equation of Kinetic energy
KE = ½mv²
Equation of Gravitational Potential Energy
GPE = mgh
Equation of elastic potential energy
EPE = ½kx²
Law of Conservation of Energy
Energy is always conserved, never lost, energy only changes forms, the total energy in the universe never changes
Power
energy transferred over time
Equations for Power
P = W/t, where W is work and t is time
Efficiency is the ratio of
useful energy out over total energy in
Efficiency is expressed graphically using
Sanskey Diagrams
In Uniform Circular Motion
Speed is constant, velocity is constantly changing, and the object is constantly accelerating
Centripetal acceleration
(ac) = v²/r
Centripetal Force
(Fc) = mv²/r = m(ac)/r
Centripetal Force
Does not do work
Note
Flashcard