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Rolling and Sliding Video Lecture | Mathematics for Class 2: NCERT

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FAQs on Rolling and Sliding Video Lecture - Mathematics for Class 2: NCERT

1. What is the difference between rolling and sliding?
Ans. Rolling and sliding are two types of motion. Rolling is a type of motion where an object moves on a surface while rotating around its own axis. Sliding is a type of motion where an object moves on a surface without rotating around its own axis. The main difference between rolling and sliding is that in rolling, the object rotates while moving, whereas in sliding, the object does not rotate.
2. How does friction affect rolling and sliding?
Ans. Friction is the force that opposes motion between two surfaces in contact. In rolling, friction is necessary to create the rolling motion. The friction between the rolling object and the surface it is rolling on allows the object to rotate and move forward. In sliding, friction is both necessary and detrimental. While friction is necessary to create motion, it can also slow down or stop the object. The amount of friction between the sliding object and the surface it is sliding on affects the speed and distance of the object's motion.
3. What are some real-life examples of rolling and sliding?
Ans. Real-life examples of rolling include a ball rolling down a hill, a car's wheels rolling on the road, and a person riding a bike. Real-life examples of sliding include a person sliding down a slide, a sled sliding down a hill, and a hockey puck sliding on ice.
4. What are the advantages of rolling over sliding?
Ans. Rolling has several advantages over sliding. Rolling causes less wear and tear on the object and the surface it is moving on because there is less friction. Rolling also allows objects to move faster and more efficiently because the rolling motion requires less energy than sliding. Additionally, rolling creates less noise and vibration than sliding.
5. What are the factors that affect rolling and sliding?
Ans. The factors that affect rolling and sliding include the surface the object is moving on, the weight and shape of the object, and the amount of friction between the object and the surface. Rolling is affected by the shape and weight of the object, as well as the smoothness of the surface it is rolling on. Sliding is affected by the weight and shape of the object, as well as the amount of friction between the object and the surface it is sliding on.
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