practice

1. Push a load with enough force to overcome dry friction. What happens after it starts moving?
2. Determine the following quantities for a car driving on a level surface with a coefficient of static friction of 0.75 (¾) and a coefficient of kinetic friction of 0.67 (⅔).
   1. Determine the car's maximum starting acceleration with and without "burning rubber". How do these two methods of starting a car compare?
   2. Determine the car's minimum braking distance with normal brakes and antilock brakes as a function of initial speed. How do these two methods of stopping a car compare?
3. The critical angle problem. At what angle of inclination will an object held in place by friction just begin to slip?
4. Write something completely different.

conceptual

1. Note to self: work this idea into a problem of some sort. "The horizontal force component of the heel as it strikes the ground when a person is walking has been measured and found to be approximately 15% of a person's weight."