Explain why the velocity and acceleration vectors behave as they do for the preset motions (linear acceleration I, II, circular motion, & harmonic motion).
Dentist Tip: Brushing three times a day is ideal. If you can brush once after every mealâbreakfast, lunch, and dinnerâyou minimize the growth of bacteria in your mouth. But wait an hour after each meal: brushing too soon can cause damage to the enamel of your teeth.
I'd encourage people to brush after lunch as well. If you brush at eight in the morning and go to bed at 10 or 11 at night, you've got 14 or 15 hours of eating, for bacteria to build up.. But too much brushing, with bad technique, can cause other problems.