Ch 4: Newton’s Laws of Motion
Focus:
Problem solving with force diagrams
Newton’s Laws:
1) If no force:
v = constant
)
0
or
0
(
≠
M
F
a
=
2) Acceleration proportional to
force and inversely with mass:
3)
Two
objects exert forces
on each other
of equal magnitude and opposite direction:
F
12
= -
F
21
Forces are vectors!
(A push or a pull) Unit: Newton (N)
is the force needed to accelerate a 1 kG mass at 1m/sec
2
∑
=
i
i
F
a
M
=
Total
force acting on mass M
Memorize this!

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