Objective:
By the end of this lesson, readers will:
- – Introduction
- Gravitation
- Gravitational Force
- – Free Fall
- – Acceleration due to Gravity
- – Mass and Weight
- – Thrust and Pressure
- – Archimedes’ Principle
- Buoyant Force
- – Relative Density
Click On The Name To Go To A Specific Topic:
Introduction:
Gravitation:
The force which attracts every object towards another object is called Gravitation.
Note: This is the universal force between every object and is present everywhere, no matter how far it is.
Key Points:
-Gravitational Force: The force between every two objects due to their masses is called gravitational force.
The formula for gravitational force was given by Newton:
2. Free Fall
If the only reason for the fall of an object is gravity, then it is called free fall.
Examples: sky diving, fruits fall from tree, balls, etc.
Acceleration due to Gravity (g):
If an object’s acceleration is due to free fall, then it is called acceleration due to gravity (g).
Formula:
g =
3. Mass and Weight:
Mass:
The amount of matter in an object is called its mass.
Mass is the same everywhere, whether on Earth or the moon.
It is a scalar quantity.
Weight:
The gravitational force applied to an object is called its weight.
Weight can be different at different places.
It is a vector quantity.
Formula:
4. Thrust and Pressure:
Thrust:
Thrust means the perpendicular force applied on a surface.
- It is a vector quantity.
- Its SI unit is Newton.
Pressure
The force applied on a unit area of an object is called pressure.
- Its SI unit is N/m2, which is also called a Pascal (Pa).
Formula
Examples of Thrust and Pressure:
–
–
5. Archimedes’ Principle:
Buoyant Force:
When an object is immersed in a liquid substance such as water, etc., an upward force is applied to it, which is called the “Buoyant Force”.
What is Archimedes’ Principle?
When an object is immersed in a liquid like water, etc., the buoyant force acting on it is equal to the weight of the liquid displaced by the object.
6. Relative Density:
The ratio of the density of an object to the density of water is called relative density.
Formula:
Summary:
- Coming Soon…
Activity (Exercise):
MCQs
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Fill in the blanks.
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Match
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Questions and Answers:
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Quiz:
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Supplementary Materials:
Provide downloadable materials for learners to review:
- – PDF Guide: “Coming Soon”
- – Cheat Sheet: “Coming Soon”
- – Video Source: “JNG ACADEMY“
- – Articles: “Blog Page“
FAQs:
What is gravitation?
Note: This is the universal force between every object and is present everywhere, no matter how far it is.
What are the difference between mass and weight?
Note: Mass is the same everywhere, whether on Earth or the moon.
It’s a scalar quantity.
Weight: The gravitational force applied to an object is called its weight.
Note: Weight can be different at different places.
It’s a vector quantity.
What are the difference between thrust and pressure?
It’s a vector quantity.
Its SI unit is Newton.
Pressure: The force applied on a unit area of an object is called pressure.
Its SI unit is N/m^2, which is also called a Pascal (Pa).