Box in a Vehicle#
A sedan is at a stop-light, with a box sitting in the back. When the light turns green, the driver accelerates too fast in the positive x-direction. From the perspective of the driver, the box slides backwards as they accelerate.
What type of friction is affecting the box and which direction is the friction force pointing from the perspective of a pedestrian watching the sedan (and box) go past?
Kinetic friction, positive x-direction
Kinetic friction, negative x-direction
Static friction, positive x-direction
Static friction, negative x-direction
Problem is from the OpenStax University Physics Volume 2 textbook, licensed under the CC-BY 4.0 license.