motion Flashcards
linear speed
a change in position with respect to time
time
rotational speed
movement in a circular path
rotation
spin around an internal axis
revolution
spin around an external axis
centripetal force
- force that keeps objects in circular motion
- acts inward
centripetal acceleration
- usually a constant change in direction for objects moving in a circle
- always acts inwards to the center of mass
period (T)
- time to complete one full cycle
- measured in seconds
center of mass (gravity)
- average location of mass
- can be outside of the object
- in order for an object to be balanced, the center if mass mist be above or below the base
- objects rotate around the COM
- lower = more stable
the _____ you are from the center, the _____ you spin
- farther
2. faster
equation for velocity
v = 2 x pi x r
———
T
equation for period
time
—–
# of cycles
in which direction do centripetal force and acceleration act?
inwards, towards the center
a reduction in the radius of a spinning object leads to ______ in their rotational velocity
an increase
when torque is applied to an object, it causes it to _____
spin or rotate
rotational inertia
an object that is spinning and wants to keep spinning
torque
a force in a circular path
lever arm
distance between the force applied (torque) and the axis
why is a door knob so far from the hinges
longer torque arm makes it easier to turn something
which part of the circle do you measure when calculating the distance covered in a circular path?
the circumference
leaning tower of pisa and why it has not fallen
COM is above the base
equation for centripetal force
Fc = MAc
