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Chapter 4 : Dynamics : Newton's Laws of Motion, TAN LIAN YIN (…
Chapter 4 : Dynamics : Newton's Laws of Motion
Solving problems with Newton's law
Free-Body Diagrams
Equilibrium problems
F-left = F-right F-up = F-down
Incline
resolve mg into x and y component x : mg sin θ
y : mg cos θ
choose x-axis along the slope
Weight
Force exerted on object by gravity
F = mg , g=9.80m/s²
Unit : Newton (N)
Always acting downward
Newton's Third Law of Motion
Action - Reaction
Object A exerts a force on object B, then object B exerts an equal force in opposite direction (on object A)
Action : Weight
Reaction : Normal Force
Newton's Second Law of Motion
States that (mv-mu)/t ∝ F and takes place in same direction.
Unit : Newton (N)
Mass
qualitative measure of inertia
Unit : Kilogram (kg)
property of object
Newton's First Law of Motion
An object is at rest or moves with constant velocity unless it is acted upon by a net force.
Inertia
Ability of an object to continue its state
rest
uniform velocity
Force
push / pull
Object at rest : needs force to move
Moving object : needs force to change velocity
Unit : Newton (N)
TAN LIAN YIN ( A20SC0397 )
