A wooden block of mass rests on a horizontal floor
PHYSICS · Multi-part · CBSE · Physics · Laws of Motion · Laws of Motion
Problem
A wooden block of mass 10kg rests on a horizontal floor. It is pulled horizontally by a constant force of 50N using a rope. The floor offers a resistive (friction) force that can take two different values in two separate trials.
(a) In the first trial the resistive force is 50N. Calculate the net horizontal force on the block, state whether the forces are balanced or unbalanced, and describe the expected motion.
(b) In the second trial the resistive force is 30N while the pulling force remains 50N. Calculate the net horizontal force and the resulting acceleration of the block.
(c) Starting from rest, how much time will the block take to reach a speed of 4ms−1 in the second trial?