- Mechanics-1 - Newton Law's Of Motion - Friction - Class 11 Physics - IIT JEE Mains and JEE Advanced
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- JEE: Chapter Notes and Important Questions - Laws of Motion
If the net external force on an object is zero , the acceleration of object is zero.
Mechanics-1 - Newton Law's Of Motion - Friction - Class 11 Physics - IIT JEE Mains and JEE Advanced
When a bus is at rest and starts suddenly moving forward the passengers inside fall back. The rate of change of momentum of a body is directly proportional to the resultant or net external force acting on the body and takes place in the direction in which the force acts.
Action and reaction do not occur on the same body they act on different bodies at same instant of time. A bird is in a wire cage hanging from a spring balance.
When the bird starts flying in the cage, the reading of the balance decreases. If the bird is in a closed cage or air tight cage and it howers in the cage the reading of the spring balance does not change. When several bodies are connected by strings, springs, surfaces of contact, then all the forces acting on a body are considered and sketched on the body under consideration by just isolating it.
The following points are kept in mind. Force acting on an object due to its interaction with another object is called a real force.
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When the resultant external force acting on a system is zero, the total momentum vector sum of the system remains constant. Walking, running, swimming, jet propulsion, motion of rockets, rowing of a boat, recoil of a gun etc. Explosions, disintegration of nuclei, recoil of gun, collisions etc. When a shot is fired from a gun, while the shot moves forwards, the gun moves backwards.
It is independent of velocity of the body. A man sits on a chair supported by a rope passing over a frictionless fixed pulley. The man who weights 1, N exerts a force of N on the chair downwards while pulling the rope on the other side.
If the chair weights N, then the acceleration of the chair is. Answer : 3. Two persons are holding a rope of negligible weight tightly at its ends so that it is horizontal.
A 15 kg weight in attached to rope at the mid point which now no more remains horizontal. The minimum tension required to completely straighten the rope is. A 40 N block is supported by two ropes. The tension in the rope attached to the ceiling is approximately :.
Newton's Laws of Motion II : JEE Main Physics Solved Question Paper
Answer : 1. A man of 60 kg is standing on the floor of a room.
A light rope is rigidly fixed to the floor and is held vertically by the man who starts pulling the rope upwards with a force of N. Answer : 4. A kg horse pulls a cart of mass kg along a level road with an acc.
If coefficient of sliding friction is 0. A 50kg, 0. An eraser weighing 2N is pressed against the black board with a force of 5N. If the coefficient of friction is 0.
Then the coefficient of kinetic friction is. A man slides down on a telegraphic pole with an acceleration equal to one-fourth of acceleration due to gravity.
Absolutely yes, solving the last 3 to 8 years Q. Paper of , 7, 8….. Last years Q. If you are pursuing your intermediate science studies and targeting for entrance examinations i.
At least revisions are a must before you start taking mock tests.
Identify problem topics and revise before proceeding to the next chapter or next section. What you have studied until then is enough. One month before the exam, concentrate on taking mock tests and revise what you have studied.
This is a must to keep you energized during exam. Keep a water bottle with you during the exam, this will not only help with thirst, but help you to maintain a cool temperament during the examination.
JEE: Chapter Notes and Important Questions - Laws of Motion
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