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Physics (emira)
3.5
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Cards (5)
Newtons first law
A body will remain at rest or move with constant
velocity
unless acted on by a
resultant
force
If
forces
are balanced the body will be either at rest or moving at a constant velocity
If forces are balanced the forces to the left = the forces to the
right
The forces
up
= the forces
down
Newtons second law
The
resultant force
is equal to the rate of change in
momentum
. The change in momentum is in the same direction as the resultant force.
F = ma
F -
Force (N)
m -
mass (kg)
a -
acceleration (ms^-2)
Newtons third law
If a body exerts a
force
on another then there will be a force of
equal
magnitude but
opposite
direction
Every force has a paired equal and opposite force
The force pairs have to act on 2
different
objects
The force pairs also have to be the
same
type of force
Linear momentum
If an object with
mass
is in motion it has
velocity
and
momentum
Linear momentum is the momentum of an object that is moving in one dimension
Linear momentum is constant unless there is a external resultant force acts on the system
p = mv
p - momentum (kgms^-1)
m - mass (kg)
v - velocity (
ms^-1
)
Net force
force is the rate of change of
momentum
on a body
F =
Δp
/
Δt
F - force (N)
Δp - Change in momentum (
kgms^-1
)
Δt - Change in time (s)
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