further mechanics - circular motion Flashcards
1
Q
what are radians
A
a measure of angle. 2π = 360°
2
Q
equation for arc length (in radians)
A
s=rθ
3
Q
angular velocity definition
A
ω = rate of change of angle with respect to time.
4
Q
linear speed
A
distance/time. distance = arc length
5
Q
in circular motion, is the object accelerating, decelerating, or at constant velocity?
A
the direction of movement is constantly changing, so there is always acceleration, even if speed stays the same. this implies the presence of a centripetal force
6
Q
what is the work done by the centripetal force
A
no work is done. there is no motion in the direction for the force so no work is done
7
Q
what is the relationship between the direction of the centripetal force and the direction of motion?
A
they are perpendicular to each other.
