Friction: a 50

question 40

Essay

Friction: A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200. What is the friction force on the box if
(a) a horizontal 140-N push is applied to it?
(b) a horizontal 175-N push is applied to it?

---

Definitions:

Diaphragm

A dome-shaped muscular partition separating the thorax from the abdomen in mammals, playing a major role in breathing by contracting and expanding the lungs.

Epiglottis

The flap-like structure that closes off the larynx during swallowing.

Larynx

The part of the respiratory tract between the pharynx and the trachea that is responsible for voice production; also called the voice box.

Palate

The roof of the mouth.