Netwon’s 2nd Law:
Summary
Lecture 7
The acceleration of a body is directly
proportional to the net force acting on
it, and inversely proportional to its
mass.
F
net
= ma
The direction of the acceleration is in
the direction of the applied
net force
the direction of the applied
.
Force:
Force is a vector
Force is a vector.
Forces are measured in units of
Newton (N). 1 N is the force required
to accelerate a mass of 1 kg with
1 m/s
2
.
1 N = 1 kg m/s
2

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Inertial Reference Frames
Â
Newton’s 1st law holds
Newton s 1st law holds
Â
moving with constant velocity
≠
not rotating and not accelerating
Weight
Force of gravity acting on a mass
F = mg, down
Newton’s Third Law of Motion:
Whenever one object exerts a force
on a second object, the second
exerts an equal and opposite force on
the first.
N t
th
ti
d th
ti
f
Note:
the action and the reaction force are
excerted on
different
objects