## Moment of Force (Torque) – Class 11 | Chapter – 7 | Physics Short Notes Series PDF for NEET & JEE

Moment of Force: The moment of force, also known as torque, is a measure of the effectiveness of a force in causing rotational motion around an axis. It is defined as the product of the force and the perpendicular distance from the axis of rotation to the line of action of the force. The formula for torque is:

τ = r x F

Where,

• τ is the torque
• r is the perpendicular distance from the axis of rotation to the line of action of the force
• F is the force applied to the object.

The moment of force is an important concept in mechanics, particularly in the study of rotational motion. It is a measure of how much a force can twist or turn an object around an axis, and is used to calculate the rotational motion of objects such as gears, wheels, and pulleys.

## Importance of Moment of Force

The moment of force, also known as torque, is an important concept in mechanics, particularly in the study of rotational motion. Here are some reasons why the moment of force is important:

• It helps explain rotational motion: The moment of force is a measure of the effectiveness of a force in causing rotational motion around an axis. It is used to calculate the rotational motion of objects such as gears, wheels, and pulleys, and is a key tool for understanding and analyzing rotational motion.
• It is used in the design of machinery: The moment of force is an important parameter in the design of machinery such as engines, turbines, and motors. By understanding the relationship between torque, rotational speed, and power, engineers can design systems that are efficient, stable, and safe.
• It is used in sports and physical therapy: The moment of force is used in sports and physical therapy to analyze and improve movement patterns. For example, it is used to study the mechanics of throwing a ball, swinging a bat, or lifting weights, and to develop exercises and rehabilitation programs to improve performance and reduce the risk of injury.
• It is used in biomechanics research: The moment of force is also used in biomechanics research to study the mechanics of human movement. By measuring the forces and moments acting on the body during different activities, researchers can better understand how the body works and develop strategies to improve performance and prevent injuries.

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