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FAQs on Irodov Solutions: Dynamics of a Solid Body (1.5) - Physics Class 12

1. What is the definition of dynamics of a solid body?
Ans. Dynamics of a solid body refers to the study of the motion of a solid body under the influence of external forces. It involves analyzing the forces acting on the body and how they affect its motion.
2. How is the motion of a solid body different from the motion of a fluid?
Ans. The motion of a solid body is different from the motion of a fluid because a solid body maintains its shape even when subjected to external forces, whereas a fluid can change its shape easily. Additionally, the particles in a solid body are closely packed and have limited freedom of movement, while particles in a fluid can move more freely.
3. What are the main types of forces acting on a solid body?
Ans. The main types of forces acting on a solid body are gravitational force, normal force, frictional force, tension force, and applied force. Gravitational force is the force exerted by the Earth on the body, normal force is the force exerted by a surface perpendicular to the body's contact with it, frictional force opposes the relative motion between the body and the surface it is in contact with, tension force is exerted by a string or rope when it is pulled, and applied force is any external force applied to the body.
4. How can we calculate the motion of a solid body under the influence of external forces?
Ans. The motion of a solid body under the influence of external forces can be calculated using Newton's laws of motion. The first law states that a body at rest or in uniform motion will continue to remain in that state unless acted upon by an external force. The second law relates the net force acting on a body to its mass and acceleration (F = ma). The third law states that for every action, there is an equal and opposite reaction.
5. Can you provide an example of the dynamics of a solid body?
Ans. Yes, an example of the dynamics of a solid body is the motion of a car on a curved road. When a car takes a turn, it experiences a centripetal force towards the center of the curve, provided by the frictional force between the tires and the road. This force allows the car to change its direction and maintain a curved path.
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