NEWTON'S LAWS

1. PPrreesseenntt eedd BByy
AANNJJUU UU..VV

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. consequence of forces acting
Acceleration is the observable
motion
Force required when object changes
realms
No mention of terrestrial or celestial
No mention of chemical composition
Limitations Of Newton’s First Law

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

9. NNeewwttoonn’’ss TThhiirrdd LLaaww
 Action-Reaction
 For every action force there is an
equal and opposite reaction force

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

12. TTeennssiioonn
((TTeennssiillee FFoorrccee))
 Tension is the force in a string, chain or tendon that is applied
tending to stretch it.
 FT

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

14. CCooeeffffiicciieenntt ooff FFrriiccttiioonn
 Kinetic Friction
• Ff = mk FN
 Static Friction
• Ff £ ms FN
 In most cases, mk ms.