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Contact Force, Friction (Part - 12) - Laws of Motion, Physics Video Lecture - Class 11

FAQs on Contact Force, Friction (Part - 12) - Laws of Motion, Physics Video Lecture - Class 11

1. What is contact force?
Ans. Contact force is a force that acts between two objects in contact with each other. It can be a result of pushing, pulling, or even normal reaction force between two surfaces.
2. What is friction?
Ans. Friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. It acts in the opposite direction to the applied force and depends on the nature of the surfaces and the force applied.
3. What are the different types of contact forces?
Ans. There are mainly four types of contact forces: - Normal force: The force exerted by a surface to support the weight of an object resting on it. - Frictional force: The force that opposes the motion between two surfaces in contact. - Tension force: The force transmitted through a string, rope, or cable when it is pulled at both ends. - Applied force: The force exerted on an object by a person or another object.
4. How is friction related to the laws of motion?
Ans. Friction is directly related to Newton's laws of motion. According to Newton's first law, an object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and direction unless acted upon by an external force. Friction acts as the external force that opposes the motion and brings the object to rest.
5. What factors affect the amount of friction between two surfaces?
Ans. The amount of friction between two surfaces depends on several factors: - Nature of surfaces: Different materials have different coefficients of friction. - Normal force: The force exerted by the object on the surface affects the frictional force. - Roughness: Rough surfaces create more friction compared to smoother surfaces. - Lubrication: The presence of a lubricant can reduce friction between surfaces.
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