A 10-kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block in meters per second per second is
A) 10.
B) 5.
C) 1.
D) 2.
E) none of these

Question

Quizplus · Accepted Answer

The net force acting on the block is the applied force minus the friction force, which is 20 N - 10 N = 10 N. Using Newton's second law, $F = ma$, where $F$ is the net force, $m$ is the mass, and $a$ is the acceleration, we can solve for $a$: $a = F/m = 10\, \text{N} / 10\, \text{kg} = 1\, \text{m/s}^2$.

A 10-Kilogram Block Is Pushed Across a Horizontal Surface with a Horizontal