Recent questions in 11th Physics

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Assertion: At the microscopic level, all bodies are made up of charged constituents (like nuclei and electrons) and various contact forces exist between them. Reason: These forces are due to elasticity of bodies, molecular collisions and impacts,

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: If force is not parallel to the velocity of the body, but makes some angle with it, it changes the component of velocity along the direction of force. Reason: The component of velocity parallel to the force remains

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion If we consider system of two bodies `A and B` as a whole, `F_(AB) and F_(BA)` are internal forces of the system `(A + B)`. They add to give a null force. Reason: Internal forces in a body or a system of particles cancel away in

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: It is not always necessary that external agency of force is in contact with the object while applying force on object. Reason: A stone released from top of a building accelerates downward due to gravitational pull of the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: A seasoned cricketer allows a longer time for his hands to stop the ball, while catching the ball. His hand is not hurt. Reason: The novice (new player) keeps his hand fixed and tries to catch the ball almost instantly. He needs to provide a much greater force to stop the ball instantly and this

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: Product of distance and velocity (i.e. momentum) is basic to the effect of force on motion. Reason: Same force for same time causes the same change in momentum for different

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: Newton’s third law of motion is applicable only when bodies are in motion. Reason: Newton’s third law does not applies to all types of forces, e.g. gravitational, electric or magnetic forces,

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: Angle of repose is equal to angle of limiting friction. Reason: When a body is just at the point of motion, the force of friction of this stage is called as limiting

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: A body of mass 1 kg is making 1 rps in a circle of radius 1 m. Centrifugal force acting on it is `4pi^2N`. Reason: Centrifugal force is given by

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Momentum of a body is the quantity of motion possessed by the body. It depends on the mass of the body and the velocity with which it moves.When a bullet is fired by a gun, it can easily pierce human tissue before coming to rest resulting in casualty. The same bullet fired with moderate speed will not cause much damage. The greater the change in momentum in a given time, the greater is the force that needs to be applied. The second law of motion refers to the general situation, where there is a net external force rating on the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Momentum of a body is the quantity of motion possessed by the body. It depends on the mass of the body and the velocity with which it moves.When a bullet is fired by a gun, it can easily pierce human tissue before coming to rest resulting in casualty. The same bullet fired with moderate speed will not cause much damage. The greater the change in momentum in a given time, the greater is the force that needs to be applied. The second law of motion refers to the general situation, where there is a net external force rating on the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Momentum of a body is the quantity of motion possessed by the body. It depends on the mass of the body and the velocity with which it moves.When a bullet is fired by a gun, it can easily pierce human tissue before coming to rest resulting in casualty. The same bullet fired with moderate speed will not cause much damage. The greater the change in momentum in a given time, the greater is the force that needs to be applied. The second law of motion refers to the general situation, where there is a net external force rating on the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Momentum of a body is the quantity of motion possessed by the body. It depends on the mass of the body and the velocity with which it moves.When a bullet is fired by a gun, it can easily pierce human tissue before coming to rest resulting in casualty. The same bullet fired with moderate speed will not cause much damage. The greater the change in momentum in a given time, the greater is the force that needs to be applied. The second law of motion refers to the general situation, where there is a net external force rating on the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Momentum of a body is the quantity of motion possessed by the body. It depends on the mass of the body and the velocity with which it moves.When a bullet is fired by a gun, it can easily pierce human tissue before coming to rest resulting in casualty. The same bullet fired with moderate speed will not cause much damage. The greater the change in momentum in a given time, the greater is the force that needs to be applied. The second law of motion refers to the general situation, where there is a net external force rating on the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Conservation of Momentum This principle is a consequence of Newton’s second and third laws of motion.In an isolated system (i.e. a system having no external force), mutual forces (called internal forces) between pairs of particles in the system causes momentum change in individual particles.Let a bomb be at rest, then its momentum will be zero. If the bomb explodes into two equal parts, then the parts fly off in exactly opposite directions with same speed, so that the total momentum is still zero. Here, no external force is applied on the system of particles (bomb).A bullet of mass 10 g

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Conservation of Momentum This principle is a consequence of Newton’s second and third laws of motion.In an isolated system (i.e. a system having no external force), mutual forces (called internal forces) between pairs of particles in the system causes momentum change in individual particles.Let a bomb be at rest, then its momentum will be zero. If the bomb explodes into two equal parts, then the parts fly off in exactly opposite directions with same speed, so that the total momentum is still zero. Here, no external force is applied on the system of particles (bomb).A shell of mass 10 kg

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Conservation of Momentum This principle is a consequence of Newton’s second and third laws of motion.In an isolated system (i.e. a system having no external force), mutual forces (called internal forces) between pairs of particles in the system causes momentum change in individual particles.Let a bomb be at rest, then its momentum will be zero. If the bomb explodes into two equal parts, then the parts fly off in exactly opposite directions with same speed, so that the total momentum is still zero. Here, no external force is applied on the system of particles (bomb).A bullet of mass 0.1 kg

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Conservation of Momentum This principle is a consequence of Newton’s second and third laws of motion.In an isolated system (i.e. a system having no external force), mutual forces (called internal forces) between pairs of particles in the system causes momentum change in individual particles.Let a bomb be at rest, then its momentum will be zero. If the bomb explodes into two equal parts, then the parts fly off in exactly opposite directions with same speed, so that the total momentum is still zero. Here, no external force is applied on the system of particles (bomb).A unidirectional force F varying with

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Conservation of Momentum This principle is a consequence of Newton’s second and third laws of motion.In an isolated system (i.e. a system having no external force), mutual forces (called internal forces) between pairs of particles in the system causes momentum change in individual particles.Let a bomb be at rest, then its momentum will be zero. If the bomb explodes into two equal parts, then the parts fly off in exactly opposite directions with same speed, so that the total momentum is still zero. Here, no external force is applied on the system of particles (bomb).Two masses of `M and 4M`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Force of Friction on Connected Bodies When bodies are in contact, there are mutual contact forces satisfying the third law of motion. The component of contact force normal to the surfaces in contact is called normal reaction. The component parallel to the surfaces in contact is called friction.In the above figure, `8 kg and 6 kg` are hanging stationary from a rough pulley and are about to move. They are stationary due to roughness of the pulley.Which force is acting between pulley and

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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