circular motion Flashcards
formula for speed/velocity in a circle (speed is constant, velocity changes)
s = dist/time (tangential speed, AKA VELOCITY, wherever you pointing)
(dist = circumference, 2pir)
what is a period of motion?
capital T, time taken for one full circular movement
what force, and in what direction is the force pointed in a circular motion perpetuated by mr emerson’s hand?
TENSION pointing radially INWWARDS parallel to the string
where is acceleration in a circular motion?
inwards force/acceleration
centripetal vs centrifugal
latin:
centripetal - center seeking
centrifugal - center fleeing
equation of acceleration and force in a circle
a(c) = v^2/r
F(c) = m * v^2/r
(centripetal, = net force)
(m = mass of rotating object)
v = (2pir)/t
centripetal force is made up of…
multiple forces, centripetal = the NET FORCE
where is friction in a circular motion FBD?
points inward, happens to be centripetal force in situations like a car turning, when in air on a strng its tension, mg + Tension when at the top of a circle motion (bcz net forces) etc.
true/false: centripetal force is its own force
no, its the sum of the forces
true/false: centrifugal force is not actually outward
true, just tangent to circle
why does it feel like theres an outward force when turning?
newtons 1st law, you stay in motion, you keep going in that tangent straight line
what coefficient of friction is required to take a turn at a speed of 16 m/s if the radius of curvature of the turn = 40.0 m?
we know centrifugal force = friction, so friction = (mv^2)/r
and as force of friction = mu*normal,
mu*normal = (mv^2)/r
and force normal = mg,
mu*mg = (mv^2)/r
divide by m, so we dont need mass!
mu = (v^2)/rg
mu = 16^2/(40 x 9.81) = .65
what is the minimum speed to make it around a loop de loop?
*WE WILL COME BACK TO THIS IN A LITTLE WHILE TO FIND OUT WHAT HEIGHT TO DROP IT AT
mg, as Fn of the ring is no longer relevant (MINIMUM),
thus
mg = (mv^2)/r
m cancels
square root of (rg) = v
