Question

explain about the sec law of motion

Answer 1

Newton's Second Law
The Big Misconception
Finding Acceleration
Finding Individual Forces
Free Fall and Air Resistance
Double Trouble
Newton's first law of motion predicts the
behavior of objects for which all existing
forces are balanced. The first law -
sometimes referred to as the law of inertia -
states that if the forces acting upon an object
are balanced, then the acceleration of that
object will be 0 m/s/s. Objects at equilibrium
(the condition in which all forces balance) will
not accelerate. According to Newton, an
object will only accelerate if there is a net or
unbalanced force acting upon it. The presence
of an unbalanced force will accelerate an
object - changing its speed, its direction, or
both its speed and direction.
Newton's second law of motion pertains to
the behavior of objects for which all existing
forces are not balanced. The second law
states that the acceleration of an object is
dependent upon two variables - the net force
acting upon the object and the mass of the
object. The acceleration of an object depends
directly upon the net force acting upon the
object, and inversely upon the mass of the
object. As the force acting upon an object is
increased, the acceleration of the object is
increased. As the mass of an object is
increased, the acceleration of the object is
decreased.
The BIG Equation
Newton's second law of motion can be
formally stated as follows:
The acceleration of an object as produced by
a net force is directly proportional to the
magnitude of the net force, in the same
direction as the net force, and inversely
proportional to the mass of the object.
This verbal statement can be expressed in
equation form as follows:
a = Fnet / m
The above equation is often rearranged to a
more familiar form as shown below. The net
force is equated to the product of the mass
times the acceleration.
Fnet = m • a
In this entire discussion,
the emphasis has been
on the net force . The
acceleration is directly
proportional to the net
force ; the net force equals
mass times acceleration;
the acceleration in the
same direction as the net force ; an
acceleration is produced by a net force . The
NET FORCE. It is important to remember this
distinction. Do not use the value of merely
"any 'ole force" in the above equation. It is
the net force that is related to acceleration.
As discussed in an earlier lesson , the net
force is the vector sum of all the forces. If all
the individual forces acting upon an object are
known, then the net force can be determined.
If necessary, review this principle by returning
to the practice questions in Lesson 2 .
Consistent with the above equation, a unit of
force is equal to a unit of mass times a unit
of acceleration. By substituting standard
metric units for force, mass, and acceleration
into the above equation, the following unit
equivalency can be written.
1 Newton = 1 kg • m/s2
The definition of the standard metric unit of
force is stated by the above equation. One
Newton is defined as the amount of force
required to give a 1-kg mass an acceleration
of 1 m/s/s.

Answer 2

see this pic it tells u second law of motion