Constant acceleration changes direction twice

[spikehoward]

Hello,

I just did a practice physics problem that asked if an object with constant acceleration can change direction twice. The answer was no. What if you had an object attached to a string spinning at constant velocity. Is the tangential acceleration constant?

 

[davenn]

What if you had an object attached to a string spinning at constant velocity. Is the tangential acceleration constant?

the tangential acceleration is zero because there is no change in speed and the direction of the acceleration is radial

 

[jbriggs444]

I just did a practice physics problem that asked if an object with constant acceleration can change direction twice. The answer was no. What if you had an object attached to a string spinning at constant velocity. Is the tangential acceleration constant?

Although the "tangential acceleration" is constant (and equal to zero), the "acceleration" in the case of uniform circular motion is not constant.