🧲 What Is Force?

Force is an effect that can start the motion of a stationary object, stop a moving object, or change an object’s speed, direction, shape, or rotation.
In simple terms, force is a push or a pull.

Everything we do in daily life involves force, even if we do not always notice it.

⚙️ Effects of Force on Objects

Force can affect objects in several important ways:

• It can move an object
  A car starts moving when force is applied to it.
• It can stop a moving object
  A bicycle slows down and stops due to friction force.
• It can change direction
  A football changes direction when kicked.
• It can cause rotation
  A door opens when force is applied to the doorknob.
• It can change shape
  Paper crumples when squeezed by hand.

🏋️ Examples of Force in Daily Life

Force appears everywhere around us:

• Pushing a car
• A dentist pulling a tooth
• Lifting a school bag
• A football player kicking the ball
• A sculptor carving stone
• Cutting paper with scissors
• Writing with a pencil
• Rolling dough (baklava making)
• Opening a door by turning the knob
• Magnets attracting metal pins
• A ship floating due to forces acting on water
• An apple falling from a tree because of gravity

📏 Measuring Force: Dynamometers

To understand how strong a force is, we must measure force.
The instrument used to measure force is called a dynamometer.

📌 The unit of force is the Newton (N), named after Sir Isaac Newton.

🔧 How Does a Dynamometer Work?

A dynamometer works using a flexible spring.

Key Principles:

• When force is applied, the spring stretches
• The amount of stretching shows the magnitude of force
• More force → more stretching
• Stretching is directly proportional to applied force

🧠 Dynamometer Specifications

• Contains an elastic spring
• Measures force in Newtons (N)
• Maximum force depends on:
  • Spring thickness
  • Spring type
  • Spring length

Important Notes:

• Thin springs → measure small forces
• Thick springs → measure large forces
• Thick springs have less elasticity
• Exceeding the limit damages the spring permanently

📌 Every dynamometer has a maximum force limit.

⚖️ Can a Dynamometer Measure Weight?

Yes!
Weight is also a force, caused by gravity pulling objects toward Earth.

That is why:

• Dynamometers measure weight
• Hand scales are a type of dynamometer

🔄 Elastic and Non-Elastic Objects

🟢 Elastic Objects

Elastic objects:

• Change shape under force
• Return to original shape when force is removed

Examples:

• Springs
• Rubber bands
• Sponges
• Balloons
• Socks
• Rubber

🔴 Non-Elastic Objects

Non-elastic objects:

• Do not return to original shape

Examples:

• Dough
• Chewing gum
• Paper

🔗 Internal Linking

• Friction Force Explained
• Force and Motion
• Newton’s Laws of Motion

🌍 Outbound Authority Links

• Britannica – Force
• NASA – Forces and Motion

🏁 Conclusion

Force is one of the most fundamental concepts in physics. By understanding how force works and how it is measured using dynamometers, students build a strong foundation for future STEM learning. From daily life actions to scientific experiments, force shapes the world around us.