NEWTON’S FIRST LAW OF MOTION: INERTIA
2 Kinds of Inertia
Inertia on Rest- an object will remain at rest, unless there is force applied to move
Inertia on Motion- a moving object will continue to move unless there is force applied to stop
Projectiles persevere in their motions, so far as they are not retarded by the resistance of the air, or impelled downwards by the force of gravity. A top, whose parts by their cohesion are perpetually drawn aside from rectilinear motions, does not cease its rotation, otherwise than as it is retarded by the air. The greater bodies of the Planets and Comets, meeting with less resistance in more free spaces, preserve their motions both progressive and circular for a much longer time.
NEWTON’S SECOND LAW OF MOTION: ACCELERATION
Newton’s second law is often stated as F=ma which means the force (f) acting on an object is equal to the mass (m) of an object times its acceleration (a). This means the more the mass an object has more force you need to accelerate and greater force the greater the acceleration. If any force generates a motion, a double force will generate double the motion, a triple force triple the motion, whether that force be impressed altogether and at once, or gradually and successively. And this motion (being always directed the same way with the generating force) if the body moved before, is added to or subducted from the former motion, according as they directly conspire with or are directly contrary to each other; or obliquely joined, when they are oblique, so as to produce a new motion compounded from the determination of both.
*2 forces acting on an object are equal there is no motion the object is at rest
*2 forces acting on an object are not equal (unbalanced) there is motion it will follow the direction of the greater force
*more force applied the grater the acceleration
*the lesser the mass the greater the acceleration