## Rolling Motion – Class 11 | Chapter – 7 | Physics Short Notes Series PDF for NEET & JEE

Rolling Motion: Rolling motion refers to the motion of an object that is rolling along a surface, such as a ball rolling down a hill or a car rolling on a road. Rolling motion is a combination of rotational and translational motion, and it has some unique characteristics that make it different from other types of motion.

When an object is rolling, it is rotating around its own axis while also moving forward. The point on the object’s surface that is in contact with the ground is the only part of the object that is not moving, and this point is called the instantaneous axis of rotation. As the object rolls forward, the instantaneous axis of rotation moves along the object’s surface.

## Characteristics of Rolling Motion

It has some unique characteristics that distinguish it from other types of motion:

• It is characterized by a rolling friction force that is generally less than the sliding friction force. This is because rolling friction occurs over a smaller area than sliding friction, which reduces the amount of resistance.
• It is more stable than sliding motion. When an object is rolling, it has a larger contact area with the ground, which provides greater stability than when it is sliding.
• It can be used to convert rotational motion into translational motion and vice versa. For example, wheels on a car or bike use rolling motion to convert the rotation of the axles into forward motion.

## Applications of Rolling Motion

It has many practical applications in various fields of science, engineering, and everyday life. Here are some of the key applications of rolling motion:

• Transportation: It is used in the design of wheels, tires, and other components of vehicles. The rolling motion of wheels allows vehicles to move efficiently with minimal friction, which is essential for maximizing fuel efficiency and reducing wear and tear on tires.
• Sports: Many sports involve objects that roll, such as balls in soccer, basketball, and bowling. Understanding the principles of rolling motion is important in designing sports equipment and analyzing the performance of athletes.
• Industrial machinery: It is used in the design of gears, pulleys, and other components of industrial machinery. These components convert rotational motion into translational motion and vice versa, and they are essential for a wide range of industrial applications.
• Robotics: It is used in the design of mobile robots, such as drones and rovers. The rolling motion of wheels and tracks allows these robots to move over rough terrain and navigate obstacles.
• Medical devices: It is used in the design of medical devices, such as artificial joints and prosthetic limbs. These devices must be able to move smoothly and efficiently, and rolling motion is often used to achieve this.

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