These notes are provide detailed information on the change in momentum chapter in the Mind Action Series Physical Science Grade 12 textbook. These notes are colourful, have diagrams for further explanation and are very easily understood.
Chapter 3
collide / explode ∴ equal forces =
exerted on objs in opp direction (Newton
3)
o Time = same for obj ∴ Δp = same
Occurs in closed / isolated system ∴ has
no net external force acting on it (e.g no Σpi = Σpf
friction present)
m1v1i + m2v2i = (m1m2)vf
{ law of conservation of m1v1i + m2(o) = (m1m2)vf
momentum } m1v1i = (m1m2)vf
Definition: Nb!
o the total linear momentum of an o If obj falls vertically,
isolated system remains
constant (is conserved)
HORIZONTAL velocity =
Om.s-1
Σpi = Σpf
Σpbefore collision = Σpafter collision
KINETIC ENERGY
= energy that an obj has due to its
SOLVING PROBLEMS motion (measured in Joule – J)
Ek = 1/2mv2
{ elastic / inelastic collisions }
Σpi = Σpf Ek (kinetic energy) x always conserved
∴ transformed into other energy forms
m1v1i + m2v2i = m1v1f + m2v2f
o linear momentum is conserved
Σpi = Σpf o colliding objects remain separate (not changed
in any way)
m1v1i + m2v2i = (m1v2)Vf o total kinetic energy is conserved
o Eki = Ekf
o Ekbefore collision = Ekafter collision
o initial kinetic energy = x transformed into any
Σpi = Σpf other forms of energy
(m1v2)Vi = m1v1f + m2v2f
o linear momentum is conserved;
o colliding objects unite / change shapes;
o total kinetic energy is not conserved
o Eki > Ekf
o (during explosion – canon)
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