# circular motion

### Torque in physics – definition & formula derivation

Torque in physics – definition Definition of Torque: Torque in physics is also known as the Moment of force. In other words, It is the Rotational analogue of force. As force causes translational motion, the Torque is the cause of rotational motion. If the net torque is zero then a body will not change its rotational

### Weightlessness in a Satellite-feeling weightless

Weightless astronaut-Weightlessness in Orbiting Satellites In this post we will discuss how does an astronaut feel weightless in a nearby orbit and what is the secret behind this weightlessness in a satellite? To start with lets see how we feel this weight. If an object rests on a surface, its weight acts downwards on the

### Angular Momentum & Moment of Inertia for Rotational Motion

Angular Momentum In our last post we have discussed on Linear momentum. Just to brush up, when an object of mass m moves with a speed v in a straight line, we say that it has a linear momentum, p=mv. When the same object moves with an angular speed ω along the circumference of a

### Kepler’s Third Law equation derivation-Time period of Satellite revolution

Kepler’s Third Law As we have derived the equations of Orbital velocity of satellite in our last post, this is the right time to discuss on an important Law of Physics, which talks on the period of its revolution. This is known as Kepler’s Third Law or 3rd Law of Kepler. The basis of deriving

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