Rotation with constant angular acceleration
- We have already studied motion with constant acceleration while studying translational motion
- Now we will study the rotational motion with constant angular acceleration
- when a rigid body rotates with constant acceleration we have
- Thus we have
- Again we have angular velocity
- Equation (8) ,(9) and (10) are the equation of motion with constant angular acceleration
Question 1. A wheel initially has an angular velocity of 18 rad/s. It has a constant angular acceleration of 2.0 rad/s2 and is
slowing at first. What time elapses before its angular velocity is 18 rad/s in the direction opposite to its initial
angular velocity?
a 3 sec
b 6 sec
c 18 sec
d none of these
Solution 11
ω0=18
ω=-18
angular acceleration(α)=-2
Now
ω=ω0+αt
or t=18
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