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FAQs on Past Year Paper, Physics (Set - 5), 2016, Class 11, Physics - Additional Study Material for NEET

1. What are the laws of motion?
Ans. The laws of motion, as described by Sir Isaac Newton, are three fundamental principles that govern the motion of objects. The first law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. The second law describes the relationship between the force applied to an object, its mass, and its acceleration. It states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. The third law states that for every action, there is an equal and opposite reaction.
2. What is the difference between speed and velocity?
Ans. Speed and velocity are both terms used to describe the motion of an object, but they have different meanings. Speed is a scalar quantity that measures how fast an object is moving without regard to its direction. It is calculated by dividing the distance traveled by the time taken. On the other hand, velocity is a vector quantity that measures the rate of change of an object's displacement with respect to time. It takes into account both the speed and direction of motion.
3. What is the relationship between force and acceleration?
Ans. According to Newton's second law of motion, the force acting on an object is directly proportional to its acceleration. The equation that represents this relationship is F = ma, where F is the force applied, m is the mass of the object, and a is its acceleration. This means that if the force applied to an object increases, its acceleration will also increase, assuming the mass remains constant. Similarly, if the force decreases, the acceleration will decrease.
4. What is the difference between static and kinetic friction?
Ans. Static friction and kinetic friction are two types of friction that occur between surfaces in contact. Static friction is the force that prevents an object from moving when a force is applied to it. It is generally greater than kinetic friction and increases as the applied force increases. On the other hand, kinetic friction is the force that opposes the motion of an object that is already moving. It is generally lower than static friction and remains constant as long as the object's speed remains constant.
5. What is the principle of conservation of energy?
Ans. The principle of conservation of energy states that energy can neither be created nor destroyed; it can only be transferred or transformed from one form to another. This means that the total amount of energy in a closed system remains constant over time. Energy can exist in various forms, such as kinetic energy, potential energy, thermal energy, and electrical energy, among others. The principle of conservation of energy is a fundamental concept in physics and is widely applicable in various scientific fields.
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