Physical science

Question

A 42 N horizontal force pushes on a 3.9 kg mass resting on a horizontal surface. The surface exerts a friction force of 12N against the motion. The acceleration of the 3.9 kg mass is ___ m/s^2.

Answer 1

First, find the net force.

F_net = F _applied - F _friction

 

Second, use Newton's second law of motion to find the acceleration.

 

a = F_net/ mass