Forces and Newton’s Laws
Physics Assignment Help & Live Online Tutoring From Our Expert Physics Tutors
 |
Classical mechanics: |
 |
| |
Classical mechanics is the branch of physics which deals with the kinematics
and dynamics of
macroscopic objects, starting from projectiles to parts of machinery, as well as astronomical
objects, such as spacecraft, planets, stars, and galaxies. It produces very accurate results within
these domains, and is one of the oldest and largest subjects in science and technology. It clearly
separates frames of reference into two types one being the inertial frame and other being the non-
inertial frame. In the inertial frames Newton’s laws are valid where as in non
inertial frames
Newton’s laws are not valid. However the relativistic theory tells that the Newton’s laws are valid in
all frames.
Newton’s first law of motion talks about the state of an object in relation to rest and motion. It
states that “an object at rest remains at rest and an object in motion continues its movement with
same speed in the same direction unless and until acted upon by an unbalanced force”. It implies
that the object has two states one being the state of rest and other being the state of motion. This
is called inertia of the object.
Inertia is the property of an object so that it may remain at rest if it is at rest (inertia of rest) and it
continues its motion without changing its speed and direction if it were moving earlier (inertia of
motion) until and unless it is acted upon by an unbalanced force. The applications of this concept
in day to day life are: (i) falling in the forward direction while the bus stops when standing inside
the moving bus without holding anything and (ii) falling backward when standing inside the bus
without holding anything so that the bus starts moving forward immediately.
The Newton’s first law gives qualitative idea about force. It shows that there is an external agent
which is responsible to change the state of an object.
Force: Force is an external agent which is responsible to change
the state of an object which is
acted upon. This is usually considered as a pull or push. When we push our empty dinner plate
away, we exert a force on it. Similarly, when we pull a bucket of water from a well, we exert a force
on it. In both the cases we have muscular activity and the change in state of the object
from rest to
motion or changing its velocity. Thus, force can accelerate the object. This idea
of force is
qualitative and is given
by the Newton’s first law of motion.
Mass: Mass of an object is the amount of substance contained in it. It is usually treated as the
property of the object which specifies the amount of inertia the object has. The greater the mass of
the object greater is the inertia. The SI unit of mass is the kilogram.
|
|
 |
|
 |
Submit your homework or assignment.
