A small block of mass rests on top of a larger block of mass
PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics
Problem
A small block of mass m rests on top of a larger block of mass 2m, which sits on a frictionless floor. The coefficient of static friction between the blocks is μs. A horizontal force F is applied to the lower block so that the two blocks accelerate together without slipping. Which of the following lists correctly identifies every force acting on the upper block and the object that exerts each force?
(a) weight (Earth on block); normal force (lower block on upper); kinetic friction (lower block on upper)
(b) weight (Earth on block); normal force (lower block on upper); static friction (lower block on upper)
(c) weight (Earth on block); normal force (lower block on upper); applied force F (hand on lower)
(d) weight (Earth on block); normal force (floor on upper); static friction (lower block on upper)