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dreamz25
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If a body is rotating in a circular orbit then what is the moment of net force acting on it about the axis of rotation?
Which way does the net force act? What's the definition of torque?dreamz25 said:0 but how?
OK.dreamz25 said:in gravitation i have read that...
the force on a planet towards radius is given by
GMm/r^2
There is no outward force.and the force which acts radially outwards is
Mv^2/r
The only force acting is gravity.so don't know where the net force acts... !:{
Good.and torque = F X R
if the direction of net force is towards center then it makes and angle of
180 degrees which gives ex. torque = 0 as sin 180 = 0 ...
By applying Newton's 2nd law. The only force is gravity. Set that equal to mass X the centripetal acceleration.dreamz25 said:How then do we derive the velocity of a plannet in circular orbit?
dreamz25 said:ok.. so u mean both of them acts towards the centre... Right?
since the force on the particle by the center equals GMm/R^2
and also by Newton's second law of motion, F = ma so, F = m x centripetal acceleration (which is towards the center) = m x v^2/r
and thus we get, v = root[GM/r] ...?
cepheid said:Centripetal force is always just a requirement for circular motion. It has to be provided by something real, like gravity, or tension in a string. Without something like this to provide (or act as) a centripetal force, there simply won't be any circular motion.
Torque is a measure of the rotational force applied to an object. It is commonly measured in units of newton-meters (N·m) or pound-feet (lb-ft).
Torque is calculated by multiplying the force applied to an object by the distance from the pivot point to the point where the force is applied. The formula for torque is T = F * d, where T is torque, F is the force, and d is the distance.
Force is a vector quantity that measures the push or pull on an object, while torque is a vector quantity that measures the rotational force applied to an object. In simpler terms, torque is a type of force that causes an object to rotate.
Examples of torque in everyday life include opening a door, turning a steering wheel, or using a wrench to tighten a bolt. In sports, throwing a ball or swinging a golf club also involve the use of torque.
Work is defined as the force applied to an object multiplied by the distance the object moves in the direction of the force. Torque is a type of force, so it is directly related to the concept of work. The more torque that is applied to an object, the more work is done to move or rotate that object.