4.1.A—Describe the linear momentum of an object or system

Describe the linear momentum of an object or system.

• Linear momentum is defined by the equation =pmv.-- -
• Momentum is a vector quantity and has the same direction as the velocity.
• Momentum can be used to analyze collisions and explosions.
  • i. A collision is a model for an interaction where the forces exerted between the involved objects in the system are much larger than the net external force exerted on those objects during the interaction.
  • ii. As only the initial and final states of a collision are analyzed, the object model may be used to analyze collisions.
  • iii. An explosion is a model for an interaction in which forces internal to the system move objects within that system apart. BOUNDARY STATEMENT Unless otherwise stated, the general term “momentum” will refer specifically to linear momentum. TOPIC 4.2 Change in Momentum and Impulse | AP Physics 1: Algebra-Based Course and Exam Description