# Shared Flashcard Set

## Details

Chapter 7
Impulse & Momentum
15
Physics
02/15/2015

Term
 Is impulse a vector quantity or a scalar quantity?
Definition
 vector
Term
 In what direction does the impulse vector point?
Definition
 the same direction as the average force
Term
 SI unit of impulse
Definition
 newton x second (N x s)
Term
 Is linear momentum a vector quantity or a scalar quantity?
Definition
 vector
Term
 In what direction does the linear momentum vector point?
Definition
 the same direction as the velocity
Term
 SI unit of linear momentum
Definition
 (kilogram x meter)/second ((kg x m)/s)
Term
 Impulse is the change in _____
Definition
 momentum
Term
 What are the two types of forces that act on a system?
Definition
 1. internal forces: forces that the objects within the system exert on each other2. external forces: forces exerted on the objects by agents external to the system
Term
 isolated system
Definition
 a system for which the sum of the external forces in zero
Term
 principle of conservation of linear momentum
Definition
 the total linear momentum of an isolated system remains constant
Term
 Can the total linear momentum be conserved even when the kinetic energies of the individual parts of a system change?
Definition
 yes!
Term
 Why can the total linear momentum be conserved even when the kinetic energies of the individual parts of a system change?
Definition
 internal forces cannot change the total linear momentum of a system
Term
 What are the two main ways in which kinetic energy is lost?
Definition
 1. it can be converted into heat because of friction2. it is spent creating permanent distortion or damage (ex. in an automobile collision)
Term
 elastic collision
Definition
 one in which the total kinetic energy of the system after the collision is equal to the total kinetic energy before the collision
Term
 inelastic collision
Definition
 one in which the total kinetic energy of the system is not the same before & after the collision; if the objects stick together after colliding, the collision is said to be completely inelastic
Supporting users have an ad free experience!