The Law of Inertia
Presented by the
Group 1
Newton’s first law of Motion
also known as the law of inertia, states
that a body at rest will continue to be at
rest, and a body in constant motion will
continue to be in constant motion along
a straight line unless acted on by a net
external force.
Inertia is the tendency of a body to resist
any change in its motion. An empty
cabinet is easier to push than a cabinet
full of books. This means that the greater
the mass of the object, the greater the
inertia it has. Also, the lesser the mass,
the lesser the inertia.
When any force is applied on an object, it
can change the object's current state of
motion. The object may speed up, slow
down, or stop when a force is applied on
it. So, if there is no force acting on an
object, the object will be either at rest or
in constant motion along a straight line.
Normal force (Fn) is a force that
exists whenever an object is in
contact with a surface. It is always
perpendicular to the surface the
object is in contact with. On the
other hand, the downward force
acting on the object is the
gravitational force (F g).
When two types of force acting on an
object are balance, there is no net
external force on it. This means that the
object will continue its current state of
motion, which is either at rest or in
constant motion. However, when a net
external force is acting on an object, it
may experience a change in its current
state of motion.
But if the two forces are balanced, so
the object will continue to move at
constant velocity. If the sum of the
forces acting on an object is zero, it is
either at rest or in constant motion.
Have you been listening? Time to
test your knowledge!
Test no.1
Fill in the blank!
1.)Not moving/stationary 2.)Does
__
not move/continues C
3.)Resisting change/measured by
mass
4.) any push or pull/strength
5.)pulls anything and
everything down
E
S
I__S___T
___C_
G_____Y
T
TEST NO.2
Lets complete the graphic designer by writing all the words
you think are related to the lesson
Write a short paragraph on what you
learnt from this presentation!
Thank
you for
listening!