2. NNeewwttoonn’’ss LLaawwss
Newton’s First Law
Law of Inertia
Newton’s Second Law
F = ma
Newton’s Third Law
Action Reaction
Law of Universal
Gravitation
F = Gmm
2
'
r
3. MMaassss
…is measured in kilograms.
…is the measure of the inertia of an object.
Inertia is the natural tendency of a body resist changes in motion.
4. FFoorrccee
…is the agency of change.
…changes the velocity.
…is a vector quantity.
...is measured in Newton.
5. NNeewwttoonn’’ss FFiirrsstt LLaaww
Law of Inertia
“A body remains at rest or moves in a
straight line at a constant speed
unless acted upon by a force.”
6. Limitations Of Newton’s First Law
No mention of chemical composition
No mention of terrestrial or celestial
realms
Force required when object changes
motion
Acceleration is the observable
consequence of forces acting
7. NNeewwttoonn’’ss SSeeccoonndd LLaaww
The Sum of the Forces acting
on a body is proportional to
the acceleration that the body
experiences
SF µ a
S F = (mass) a
8. F =
ma
å Fx = max
å Fy = may
Net Force
å Fz = maz
10. TThhee LLaaww ooff GGrraavviittyy
Every mass exerts a force of attraction on every other mass.
Mathematically…
F = Gmm
2
'
r
G = 6.67 ´ 10-11 N·m2/kg2
11. WWeeiigghhtt
The weight of an object FW is the gravitational force acting downward
on the object.
FW = m g
13. NNoorrmmaall FFoorrccee
The normal force on an object that is being supported by a surface is
the component of the supporting force that is perpendicular to the
surface.
FN