Section: Chemical and Physical Foundations of Biological Systems

38) An object rests on a plane, with an angle of incline, ?, an acceleration due to gravity, g, and a coefficient of friction µ between the object and the plane. Which of the following gives the acceleration of the object?

1. a = g sin ?
2. a = g (sin ? – cos ?)
3. a = g (cos ? – µ sin ?)
4. a = g (sin ? – µ cos ?)