2. Newton’s Three Laws of
Motion
The principles behind newton’s laws of motion
are very significant in understanding the motion
of an objects in our universe.
Understanding these laws , helps us understand
why the things around us move or behave the
way they do.
The three laws of motion were first compiled by
SIR ISAAC NEWTON in his book “Mathematical
Principle of Natural Philosophy”, first published
in 1687.
3. Sir Isaac Newton
(1642-1727)
A Mathematician
and Physicist, one of
the foremost
scientists intellects
of all time.
He related forces to
the motion of
objects.
4. Sir Isaac Newton (1642-
1727)
He noticed that moving
objects tend to be
moving continuously
unless it is stopped by
a frictional force. On
the other hand, he also
observed that an object
at rest will remain
stationary unless
something makes it
move.
5. Three laws of motion
1. Law of Inertia
2. Law of Acceleration
3. Law of Interaction
6. Inertia is an object’s ability to resist
changes in motion.
Tendency of an object to react to a change
of motion.
It increases as mass increases.
The First Law of Motion states that:
“An object at rest will remain at rest and an
object in motion continues in motion with
same speed and in the same direction
unless acted upon by an unbalanced force.”
Inertia
7.
8.
9.
10.
11.
12.
13.
14. Examples of Inertia:
1. A person is pedalling their bike and suddenly
hits the front brakes and their body continue to
move and they fly over the handle bars.
2. A person is riding a jet ski in a straight line and
suddenly turns the handles and their body
continues moving in straight line at the same
speed as they are thrown from the jet ski.
3. A car traveling too fast down a road attempts a
curve but the friction is not enough to hold the
car and the car continues moving straight and
goes off the road.
15.
16. Several applications of
Newton’s Law of Inertia
1. Blood rushes from your head to your feet
when riding on a descending elevator which
suddenly stops.
2. To dislodge ketchup from the bottom of a
ketchup bottle, the bottle is often turned
upside down, thrust downward at a high
speed, and then abruptly stop.
17. Several applications of
Newton’s Law of Inertia
3. Headrests are placed in cars to prevent
whiplash injuries during rear-end
collisions.
4. Seatbelts and air bags are developed in
order to prevent passengers and drivers
from flying off a moving vehicle due to
sudden stopping or head-on collisions.
18. ANSWER THIS
1. By applying the Law of Inertia, which is harder to
move, Truck A or Truck B? Why?
A.
B.
