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Variable Mass System Variable Mass System :- Generally mass of a system remains constant but there are some situations in which mass of a system changes and the study of motion of these systems is done using laws of motion. From Newton’s second law, …..(1) Now there are two cases : Case…
Conservation of momentum in collisions Consider a system of two particles A and B. Let the momentum of the particles before collision is and respectively and after collision let the momentum are and respectively. Let the particles are in contact for a small time Δt during collision. Using Newton’s second law, force on A…
A gun weighing 10 kg fires a bullet Question :- A gun weighing 10 kg fires a bullet of 20g with a velocity 250 m/s. With what velocity does the gun recoil? Solution :- Here M = 10 kg, m = 2g = 0.02 kg, v = 250 m/s, V = ? Applying the…
A bomb at rest explodes into three equal fragments Question :- A bomb at rest explodes into three equal fragments. Two fragments fly off at right angles with velocity 12 m/s and 9 m/s. If the explosion process occurs in 0.1 s, find out the average force acting on the third particle, if total mass of the bomb…
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A bomb at rest explodes When a bomb at rest explodes into some fragments, we can find the velocity of it’s fragments using Law of Conservation of Linear Momentum. Suppose a bomb at rest explodes into two pieces with their masses in the ratio 3 : 1. Let : 3 m = mass of…
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A bomb at rest splits into three identical parts Question :- A bomb at rest splits into three identical parts. If two pieces are moving at right angles to each other with same velocity v m/s, the velocity of third fragment is (A) v/√2 (B) v/2 (C) 2v (D) v√2 Solution :- Before splitting,…
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Recoil of Gun | Recoil of Gun is an example of Law of conservation of linear momentum Recoil of Gun is an example of Law of Conservation of Linear Momentum. Initially when the gun is not fired, the gun as well as the bullet inside it is at rest. So total momentum of system(Gun +…
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Law of Conservation of Linear Momentum Law of Conservation of Linear Momentum :- According to the law of conservation of linear momentum, ‘if the total external force acting on a system is zero, then the total linear momentum of the system remains constant’. According to Newton’s second law, the rate of change of…
Mechanical Equivalent of Heat Mechanical Equivalent of Heat :- In early days heat was not recognized as a form of energy. Heat was supposed to be something needed to raise the temperature of a body or to change its phase. James Prescott Joule first experimentally found that the “heat produced in a system is…
Heat | Heat Energy Heat | Heat Energy :- Heat is a form of energy that is being transferred from one body to another or between adjacent parts of a body as a result of temperature difference. When a body is heated, its temperature increases and molecules begin to move with greater kinetic energy….