11th Class Physics Chapter 5 Notes

Important Easy to understand 11th Class Physics Chapter 5 Notes Circular Motion written by Professor Mr. Asad Abbas Suib. These notes are very helpful in the preparation of 11th class physics chapter 5 exercise for students of the 11th class and these are according to the paper patterns of all Punjab Book Boards.

Summary and Contents:

Topics which are discussed in the notes are given below:

Very Important Multiple Choice Questions class 11th physics chapter 5 mcq with Answers of the Chapter No. 5: Circular Motion in 1st Year Physics Punjab Book Boards.
Important from class 11th physics chapter 5 important questions Punjab Textbook.
What is Angular displacement? State right hand rule.
Right hand rule to find the direction of angular displacement
What is Angular velocity? What is average and instantaneous angular velocity?
Define Angular acceleration? what is average and instantaneous angular acceleration?
Relation b/w linear and angular velocities OR prove that v=r w
Relation b/w angular and linear acceleration. OR prove that a=ra
Write Equations of motion in case of angular motion
What is Centripetal force and centripetal acceleration? derive their relations.
Expression for centripetal acceleration and centripetal force
What is Moment of Inertia? Calculate the torque in terms of moment of inertia on rigid body.
What is Angular momentum? Prove that L=Iω.
State and explain Law of conservation of angular momentum.
What is Rotational Kinetic Energy? calculate rotational kinetic energy and speed for disc and hoop.
What is Artificial satellite? Derive the formula for speed and time period of artificial satellite.
What is Real and apparent weight? Discuss its different cases.
Write a note on Weightlessness in satellite and gravity free system.
What is Orbital velocity? Derive its formula.
What is Artificial Gravity? Derive the expression for frequency of spaceship.
What is Geostationary Orbit? write its uses and derive the formula for radius of geostationary orbit.
What is Communication satellite? Explain.
Why Microwaves are used in communication satellite?
Describe Newton and Einstein views of gravitation.
What is Differences b/w Einstein and Newton views about gravitation?
Why Einstein theory of gravity is better than Newton theory of gravitation?
Explain the difference between tangential velocity and the angular velocity. If one of these is given for a wheel of known radius, how will you find the other?
Important from class 11th physics chapter 5 question answer Punjab Textbook.
Explain what is meant by centripetal force and why it must be furnished to an object if the object is to follow a circular path
What is meant by moment of inertia? Explain the significance
What is meant by angular momentum? Explain the law of conservation of angular momentum.
Show that orbital angular momentum Lo = mvr.
Important from class 11th physics chapter 5 exercise questions Punjab Textbook.
Describe what should be the minimum velocity, for a satellite, to orbit close to the Earth around it.
State the direction of the following vectors in simple situations; angular momentum and angular velocity.
Explain why an object, orbiting the Earth, is said to be freely falling. Use your explanation to point out why objects appear weightless under certain circumstances.
When mud flies off the tyre of a moving bicycle, in what direction does it fly? Explain.
A disc and a hoop start moving down from the top of an inclined plane at the sametime. Which one will be moving faster on reaching the bottom?
Important from class 11th physics chapter 5 exercise Punjab Textbook.
Why does a diver change his body positions before diving in the pool?
A student holds two dumb-bells without stretched arms while sitting on a turntable. He is given a push until he is rotating at certain angular velocity. The student then pulls the dumbbell towards his chest. What will be the effect on rate of rotation?
Explain how much minimum number of geo-stationary satellites are required for global coverage of T.V.
A tiny laser beam is directed from the Earth to the Moon. If beam is to have a diameter of 2.50 m at the Moon, how small must divergence angle be for the beam? The distance of Moon from the Earth is 3.8 *10^8m .
Important from class 11th physics chapter 5 numericals Punjab Textbook.
A gramophone record turntable accelerates from rest to an angular velocity of 45.0 rev min-1 in 1.60s. What is its average angular acceleration?
A body of moment of inertia I = 0. 80 kg m^2 about a fixed axis, rotates with a constant angular velocity 100rad s^-1. Calculate its angular momentum L and the torque to sustain this motion.
Consider the rotating cylinder shown in fig. 5.26. Suppose that m=5.0 kg, F=0.60 N and r=0.20 m. Calculate (a) the torque acting on the cylinder, (b) the angular acceleration of the cylinder. (Moment of inertia of cylinder = 1/2 mr^2 ).
Calculate the angular momentum of a star of mass 2.0*10^30 kg and radius 7.0*10^5 km . If it makes one complete rotation about its axis once in 20 days, what is its kinetic energy?
A 1000 kg car travelling with a speed of 144kmh-1 round a curve of radius 100m. Find the necessary centripetal force.
What is the least speed at which an aeroplane can execute a vertical loop of 1.0km radius so that there will be no tendency for the pilot to fall down at the highest point?
The Moon orbits the Earth so that the same side always faces the Earth. Determine the ratio of its spin angular momentum (about its own axis) and its orbital angular momentum. (In this case, treat the Moon as a particle orbiting the Earth). Distance between the Earth and the Moon is 3.85*10^8 m .Radius of the Moon is 1.74*10^6 m.
The Earth rotates on its once a day. Suppose, by some process the Earth contracts so that its radius is only half as large as at present. How fast will it be rotating then? (For sphere l=1/2MR^2 ).
What should be the orbiting speed to launch a satellite in a circular orbit 900 km above the surface of the Earth? (Take mass of the Earth as 6.0*10^24 km and its radius as 6400 km).

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