1.7 Linear Momentum and Impulse

Question 1

linear momentum

Answer 1

product of mass and velocity
vector quantity

Question 2

equation for linear momentum

Answer 2

p=mv

Question 3

change in momentum

Answer 3

momentum before-momentum after

Question 4

principle of conservation of momentum

Answer 4

total momentum of an isolated system remains constant
or
in a system of colliding bodies, the momentum before collision is equal to momentum after collision provided no external forces act

Question 5

equation for principle of conservation of momentum

Answer 5

total momentum before collision = total momentum after collision

Question 6

isolated system

Answer 6

one in which no internal forces act

Question 7

external force

Answer 7

forces that act on a structure from outside
e.g. friction, weight

Question 8

internal force

Answer 8

forces exchanged by particles in system
e.g. tension in string

Question 9

elastic collisions

Answer 9

objects do not stick together/coalesce
move in opposite directions after colliding
both momentum and KE conserved

Question 10

elastic collision equation

Answer 10

kinetic energy before = kinetic energy after

Question 11

inelastic collisions

Answer 11

momentum conserved
KE not conserved
collision in which there is a loss of kinetic energy during the collision

Question 12

inelastic collision equation

Answer 12

momentum before = momentum after