circular motion Flashcards
(11 cards)
1
Q
In circular motion, the linear velocity changes, but the linear speed is constant. How can this be?
A
- velocity is a vector quantity
- even though the magnitude (speed) is constant, the direction constantly changes
- the centripetal acceleration changes the direction only
2
Q
what is centripetal force
A
the velocity is always at a tangent to the objects path
3
Q
at what angle does a force act on the object during circular motion
A
90 degrees
4
Q
what is the equation for acceleration using radius
A
a = v^2 / r
5
Q
what is the equation for force using radius
A
F = mv^2 / r
6
Q
what is angular velocity measured in
A
radians
7
Q
what is the equation for velocity using angular velocity
A
- v = (angular velocity) x r
- v = 2 x pi x r / T
8
Q
what is the support force on the centripetal force that is sideways
A
s = mv^2 / r
9
Q
what is the upwards support force in centripetal force
A
- more support is needed for the weight
- s = mv^2 / r + mg
10
Q
what is the downwards support force in the centripetal force
A
- less support force is needed since weight helps
- s = (mv^2 / r) - mg
11
Q
equation for finding radians
A
angle x pi / 180
