Basic Physics concepts

1. Basic help to solve physics home
problems

2. Newton's laws of motion state the relationship
between a body and the forces acting upon it, and
its motion in response to the forces.
There are three laws of motion which were compiled
by Isaac Newton.

3.  An object either remains at rest or continues
to move at a constant velocity, unless acted
upon by an external force.
 Newton's first law of motion is also known
as the Law of Inertia.

4.  The vector sum of the forces F on an object
is equal to the mass m of that object
multiplied by the acceleration vector a of
the object.
 Newton's second law of motion is known as
the Law of Acceleration

5.  When one body exerts a force on a second
body, the second body simultaneously
exerts a force equal in magnitude and
opposite in direction on the first body.
 Newton's third law of motion which is
known as the Law of Action and Reaction.

6. Newton's first law
 As per the law, if the net force is zero, then the velocity
of the object is constant.
 Velocity is a vector quantity which represents both the
object's speed and the direction of its motion
 The statement that the object's velocity is constant is a
statement that both its speed and the direction of its
motion are constant.
The first law can be stated mathematically as
Σ F = 0 => dV/dt = 0

7. Newton's second law
As per the law the net force on an object is equal
to the rate of change of its linear momentum.
F = m(dV/dt) = ma
where F is the net force applied, m is the mass of
the body, and a is the body's acceleration.

8. Newton's third law
As per the law all forces exist in pairs: if one
object A exerts a force FA on a second object B,
then B simultaneously exerts a force FB on A,
and the two forces are equal and opposite:
FA = −FB

9.  These three laws are excellent approximations
at the macro scales and speeds of everyday life.
 However, Newton's laws are inappropriate for
use in certain situations like
- at very small scales
- very high speeds
- very strong gravitational fields
 Newton’s laws are very helpful to understand
physics concepts.

10. Thank you