A student is investigating how horizontal forces affect the motion of a wooden block…
PHYSICS · Multi-part · CBSE · Physics · Laws of Motion · Laws of Motion
Problem
A student is investigating how horizontal forces affect the motion of a wooden block sliding on a table. Consider only forces that act along one straight horizontal line.
(a) Define the net force acting on the block and state how a sign convention is established for such one-dimensional situations.
(b) Explain qualitatively how kinetic friction acting opposite to the direction of motion alters both the magnitude and the sign of the net force when the block is being pulled toward the right.
(c) The student claims: “If two equal and opposite forces act on the block, it must accelerate in the direction of the bigger force.” Identify and correct the error in this statement, giving suitable reasoning based on Newton’s second law.