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Physics Definitions
Paper 1
Momentum and Impulse
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Momentum
The
product
of an object's
mass
and its
velocity.
Linear momentum
A
vector quantity
with the same
direction
as the
velocity
of an object.
Newton's
Second
law in terms of
momentum.
The net force acting on an object is
equal
to the
rate of change
in
momentum
of the object in the
direction
of the net force.
Impulse
The
product
of the net force acting on an object and the
time
the net force acts on the object.
Isolated System
A system on which the
net external force
is
zero.
Principle of conservation of linear momentum
The
total linear momentum
of an
isolated
system remains
constant
(is
conserved
).
Elastic Collision
Collision in which
both the total
momentum
and
kinetic energy
are
conserved.
Inelastic collision
A collision in which the
total kinetic
energy is
not conserved.
