Dynamics - Applications on Newton's laws of motion — Impulse

About this lesson

This unit covers the concepts of impulse and momentum, focusing on their application to Newton's laws of motion. It begins with an activity involving dropping different balls from a constant height to observe rebound differences, linking this to changes in momentum. The unit then formally defines impulse as the product of force and time, presents its vector nature and units, and derives the impulse-momentum relation from Newton's second law. It includes worked examples and exercises on calculating impulse for constant and variable forces, using integration for force-time graphs, and solving problems involving vertical and horizontal collisions with surfaces like the ground, walls, and ceilings. The text also introduces impulsive forces as extremely large forces acting over infinitesimal time intervals, and discusses how to find the reaction force during impacts. By the end, students should be able to compute impulse, relate it to momentum change, and solve collision problems involving vertical and horizontal motion.