An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Conditions ∑F=0 => Equilibrium
Annotations:
free particle: not subject to any interaction
Rest
Annotations:
a=0
vo=0
∑F=0
Constant motion
Annotations:
a=0
Vo>0
∑F=0
Newton's Second Law
Annotations:
Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
∑F=m*a
Annotations:
m=constant
Newton's Third Law
Annotations:
For every action, there is an equal and opposite reaction.