# Test Review Guide Chp 8 & 9

```Physics Test Review - Chp. 8 and 9
I.
II.
III.
IV.
V.
VI.
VII.
Angular speed,ω
○ turns around circle x 2π
● finding linear speed of rotating object, v = (ω)(r)
Centripetal force
● all natural forces that make an object go in circular motion
○ Fc = (mv2)/r
● centripetal acceleration
○ ac = v2/r
● object in orbit, driving around curved road (flat or banked), object spinning while
attached to string.
Universal gravitation
● G = 6.67 x 10-11 (Nm2)/kg2
● Fg = G∙(m1m2)/r2
Torque
● Force applied some distance away from a center of rotation
● eqn: τ = r∙F
● static equilibrium: torque on both sides of center of rotation must be equal
● applying torque at an angle
Center of gravity
● for an object to remain upright, center of gravity must act inside area of support
Rotational Inertia
● dependent on mass and mass distribution, mv2
● moment of inertia, I
Angular acceleration
● change in angular speed per change in time
● linear accel. = radius of circle x angular accel.
● angular accel. = τ / I
```
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