Recent questions tagged chapter5

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Inertia of an object is directly dependent on

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

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If impulse `I` varies with time `t` as `F(kg ms^(-1))= 20t^2 - 20t`. The change in momentum is minimum at

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The force which is dissipative in nature is

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Suppose a light-weight vehicle (say, a small car) and a heavy weight vehicle (say, a loaded truck) are parked on a horizontal road. Then, which of the following statement is correct

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Which one of the following statement is

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If no external force acts on particle, then which of the following statement is incorrect about

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Match the Column I (type of friction) with Column II (value of `mu`) and select the correct option from the codes given below. Column I Column II A. Static friction p. p is highest B. Rolling friction q. p is moderate C. Kinetic friction r. p is lowest

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

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In the diagram shown in figure, match the Column I with Column II and select the correct option from the codes given below. (Take,`= 10 ms^(-2)`) Column I Column II A. Acceleration of 2 kg block p- 8 (SI unit) B. Net force on 3 kg block q- 25 (SI unit) C. Normal reaction between 2 kg and 1 kg r. 2 (SI unit)

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Assertion: Aristotle stated that an external force is required to keep a body in motion. Reason: Opposing forces are always present in the natural

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Assertion: A body is momentarily at rest but no force is acting on it at that time. Reason: When a force acts on a body, it may not have some

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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,

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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

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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

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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

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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

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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

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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,

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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

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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

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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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