NEWTON'S FIRST LAW OF MOTION
OBJECTIVES
🔷To state and explain Newton's 1st law of motion
🔷To find applications for 1st law from daily life
🔷To describe inertia
🔷To tabulate the examples for inertia
🔷To relate mass and inertia of a body
🔘SUMMARY
Sir Isaac Newton(1624-1727), an English scientist and mathematician is famous for his three laws of motion. Among these laws, the 1st law says about inertia, hence this law is also called as law of inertia. Inertia is the tendency of a body to continue in it's state of rest or state of uniform motion. Many examples and applications are there for the 1st law.
🔘TEXT
Newton’s 1st law of motion
Sir Isaac Newton(1624 – 1727) was an English
scientist and mathematician famous for his three
laws of motion.
Definition
Every body continues in it’s state of rest or state
of uniform motion unless it compelled by an external
unbalanced forceWhat is meant by this?
An object at rest will remain at rest, and an
object moving at a constant velocity will continue moving at a constant velocity, unless it is acted upon by an unbalanced force.
For example a soccer ball at rest will remains at rest unless it kick by a player
Unbalanced force
• An unbalanced force can cause an object to start moving, stop moving or changes direction.
• Result in a net force and cause change in the
object’s motion.
Ineratia
Inertia is the property of a body by virtue of
which it opposes any agency that attempts to put it
in motion or, if it is moving, to change the magnitude or direction of its velocity. There are two types of inertia
1. Inertia of rest
2. Inertia of motion
Inertia of rest
The tendency of a body to continue at rest
Examples -
• If a striker hits a pile of coins on a carom
board the lowest coin moves out, the other
coin falls down
• When we are standing in a bus and the bus
starts suddenly, we tend to move backward
• When the branch of a mango tree is shaken
mangoes fall down
• If a coin placed on a card over a tumbler is
flicked with the finger, the coin falls down into the tumbler
Inertia of motion
The tendency of a body to continue at a state of
motion
Examples -
• When the bus stop abruptly, the passengers
lurch forward
• A running athlete can not stop himself
abruptly at the finishing line in a space
• A wet umbrella is rotated vigorously and then
stops abruptly, then water on the umbrella
spun off
• A person jumping out of a moving bus falls
down if he fails to run
• When pedalling a bicycle, if you stop
pedalling, then the cycle continue going for
sometimes
• A fan continues it’s motion for sometimes
even if we switched off it
• Flying over the handle bars if your cycle stops
suddenly
INERTIA AND MASS
• The inertia of an object depends on it’s mass
• When the mass increases inertia also increases
How this can be illustrated?
• It is more difficult to roll a filled drum than an
empty one
• It is more difficult to push a car compared to a
bicycle
• A bat need to have more velocity to hit a cricket
🔻 Case studies
This topic does not require any case study
🔻 FAQ
◾️Define Newton's first law of motion
◾️Give any two applications for Newton's first law of motion
◾️'Massive objects are difficult to move' substantiate the statement
🔘AUDIO OR VIDEO
🔘ASSIGNMENTS
◾️Prepare a note on the applications of Newton's first law of motion
◾️Set a pile of coins, and take an out side coin and flick that towards lowest coin of the pile.What are your observations and what is the reason for that
🔻QUIZ
To attend the quiz click here
🔻TUTORIAL
Click here for a good tutorial
🔘REFERENCE
- J C Upadhay- classical mechanics
- SCERT Text book IX th Std Physics
- Techers hand book
🔻GLOSSARY
◾️Mass - A measure of how much matter is in an object
◾️Uniform motion - Movement of a body along a straight line with steady speed
◾️Net force - The vector sum of forces acting on a body
🔻Link
🔘DOWNLOADS
🔘CONTACTS
Anju K R
anjukr745@gmail.com
🔴To view E content click here
No comments:
Post a Comment