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Week 2: Forces & Newton's Laws of Motion (the 3 Newton's Laws,…
Week 2: Forces & Newton's Laws of Motion
Force
Definitions
Push/Pull
Vector quantity with magnitude & direction
SI unit: Newtons (N) or (kg m /s^2)
1 Newton = Force that gives acceleration 1 m/s^2 to 1 kg of object
Interaction between 2 objects/ between an object & its surroundings.
4 types
Friction: Force that acts to resist the sliding of object on the surface
Tension: Force normally encountered when the object is pulled by a rope/chord
Gravitational: Force that the planet is exerting on you
Normal: Support force exerted upon an object that is in contact with another stable object
Perpendicular to the surface & points away from it
the 3 Newton's Laws
Second
: Force = Change in momentum (mV, mass x velocity) per change in time.
F =ma, when mass is constant
Insert vector form from notes
(means) Resultant sum of all forces on the object = Mass of object X acceleration
Acceleration: Rate of change in velocity
Has SAME direction as resultant force. THUS must be accompanied by force
When =0, net force on object = 0
Mass VS Weight
Weight: Force exerted by gravity on the object, varies on different planets
W = Mass x Gravity, (Gravity is negative when pulling in -y direction)
Weight on EARTH (N) = Mass of EARTH (g) (Proportional)
Mass: The ACTUAL amount of material in the body (measured in kg/ pounds). Always constant
Third
: The mutual actions of 2 objects upon each other are equal and directed to contrary parts.
Equal magnitude but OPPOSITE directions
Fab = - Fba
First
: Every object resumes either at rest or at a constant speed in a straight line, unless an external unbalanced net force acts on it
aka the Law of Inertia: Tendency to do nothing/ remain the same
Velocity of object at rest: 0 m/s
(Even if) Acceleration = 0, the object still moves with constant velocity
Scalar: Has magnitude only (eg Time, temperature)
Other vector quantity: Velocity, accelerations