# Chapter 5 Notes | Physics 1st Year

## “Circular Motion”

#### Index:

- Circular Motion
- Anglar Displacement
- Angular Velocity
- Angular Acceleration
- Relation Between Angular And Linear Velocities
- Relation Between Linear And Angular Acceleration
- Centripetal Force
- Moment Of Inertia
- Angular Momentum
- Types Of Angular Momentum
- Law Of Conservation Of Angular Momentum
- Rotational Kinetic Energy
- Artificial Satellites
- Real And Apparent Weight
- Weightlessness In Satellites And Gravity Free System
- Orbital Velocity
- Artificial Gravity
- Geostationary Orbits
- Communication Satellites

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#### Key Points:

- Angular displacement is the angle subtended at the center of a circle by a particle moving along the circumference in a given time.
- SI Unit of angular measurement is radian.
- Angular acceleration is the rate of change of angular velocity.
- Relationship between angular and tangential or linear quantities.
- s=rθ
- Vt=rω
- at=rα

- Moment of inertia is the rotational analogue of mass in linear motion. It depends on the mass and the distribution of mass from the axis of rotation.
- Angular momentum is the analogue of linear momentum and is defined as the product of moment of inetia and angular velocity.
- Total angular momentum of all the bodies in a system remains constant in th absence of an external torque.
- Artificial satellites are the objects that orbit around the earth due to gravity.
- Orbital velocity is the tangential velocity to put a satellite in orbit around the Earth.
- Artificial gravity is the gravity like effect product in an orbiting spaceship to overcome weightkessness by spinning spaceship about its own axis.
- Geo-stationary satellite is the one whose orbital motion is synchronized with the rotation of the Earth.
- Albert Einstine viewed gravitiob as a space-time curvature around an object.

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