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Lecture 11: Laws of motion
Newton’s 1st Law: Inertia
Matter resists motion
If at rest, it will stay
at rest
If in motion, it will
stay in motion
Mass is a measure of
Newton’s 2nd Law
An unbalanced force
acts on objects
equal to its mass
and acceleration
F = force
m = mass
a = acceleration
All objects in the
universe attract each
Gravity is a function
of mass and
More mass= more
More distance = less
Weight and gravity
The pull of gravity on
Earth is 9.8m/s 2
Weight is mass X the pull of
gravity (w=mg)
Q: are weight and mass the
Q: do we weigh the same
on the moon as on earth?
Terminal velocity
The maximum speed
objects fall to earth is
200 mi/h or 320km/h
How does the
parachute slow the
Newton’s 3rd Law
Forces act in pairs
For every action
force, there is an
equal and opposite
reaction force
Momentum = mass X velocity
The greater the mass,
the greater the
Ex: semi trucks take
longer to stop than
Q: will momentum be
greater at more
Action and reaction force pairs