Aristotle's FallacyAn external force is required to keep a body in motion.Note: Aristotelian law of motion is flawed
State of rest and State of uniform linear motion are equivalent.
IntertiaIf net force is zero , a body at rest continues to be at rest and a body in motion continues to move in uniform velocity. This property of body is called intertia.Intertia means resistance to change.
Newton First Law of motionEvery body continues to be in its state of rest or of uniform motion in a straight line unless compelled by some external force to act otherwise.
Newton Second Law of motionThe rate of change of momentum is directly proportional to the applied force and takes place in the direction in which the force acts.
Same force for same time causes same change in momentum for different bodies.
Newton Third Law of motion
Law of conservation of momentumThe total momentum of an isolated system of interacting particles is conserved.
Equilibrium of particle
Common forces in mechanicsa. Frictional Forceb. Gravitational Forcec. Tension in String
Frictiona. Static Frictionb. Kinetic Frictionc. Rolling Friction