Is torque necessary for rotation?

A torque is required to STOP something from rotating. A torque is NOT required to KEEP something rotating. Originally Answered: A body is in rotational motion.

Can an object continue to rotate in the absence of torque?

When an object is spinning in a closed system and no external torques are applied to it, it will have no change in angular momentum. If the net torque is zero, then angular momentum is constant or conserved.

Can a body rotate without external torque?

In rotational equilibrium, the sum of the torques is equal to zero. In other words, there is no net torque on the object. If net forces acting on the body is zero = TORQUE IS NOT ZERO and body will ROTATE. If net forces acting on the body is NOT zero = TORQUE IS ZERO and body will NOT ROTATE.

What is torque explain the torque acting on a particle?

Torque is a measure of the force that can cause an object to rotate about an axis. Just as force is what causes an object to accelerate in linear kinematics, torque is what causes an object to acquire angular acceleration. The direction of the torque vector depends on the direction of the force on the axis.

What force causes torque?

Definition and relation to angular momentum A particle is located at position r relative to its axis of rotation. When a force F is applied to the particle, only the perpendicular component F⊥ produces a torque.

Can the torque on a particle be zero without the force being zero explain?

(a) Can the torque on a particle be zero without the force being zero? (a) If the torque is zero then r × F = 0 Now N = r × F hence N = 0 ⇒ r or F is zero, or r and F are parallel. i.e. yes. either r = 0 (the force is acting at the origin) or r and F are parallel; and so F is acting in a direction through the origin.

Can torque be zero when force is nonzero?

According to Newton’s third law, the sum of all the internal forces is zero. We have Ftot = MaCM. If the total force acting on the object is zero, the center of mass of the object will not accelerate. The total torque can be nonzero, even though Ftot = 0.

What if there is no torque?

If the net torque is not zero, there will be angular acceleration. It implies the angular velocity will be continuously changing. Conversely, if angular velocity is not changing, that is , if angular velocity is constant, angular acceleration is zero and there is no torque.

What force does not cause any torque?

Any force that is along a line which passes through the axis of rotation produces no torque. Note that torque is a vector quantity, and, like angular displacement, angular velocity, and angular acceleration, is in a direction perpendicular to the plane of rotation.

What are the factors that determine a torque?

Examples: Page 5 Torque is Determined by Three Factors: The magnitude of the applied force. The direction of the applied force. The location of the applied force.

Why is torque not a force?

Torque is related to force because it is the measurement of the effect of a type of force, the rotational force. However, it is not a push or a pull, as a usual force is, it is a twist. Torque ultimately explains the effects of rotational force on an object.

Can you have force without torque?

Since torque is always about some point, if there’s a net force on an object you can always find some point about which there will be a torque. But you can certainly have a net force on an object that gives no torque about its center of mass.

Does an object rotating have torque or momentum?

An object rotating can have a Net Torque acting on it or it can act on Angular Momentum. It depends whether angular speed or angular acceleration is used for the same Rotational Inertia.

What is torque and Newton’s second law for rotation?

Torque and Newton’s Second Law for Rotation. Torque, also known as the moment of force, is the rotational analog of force. This word originates from the Latin word torquere meaning “to twist”.

Why is the applied torque equal to the friction torque?

That means the applied torque is exactly equal to the frictional torque. If the angular velocity is not constant, the net torque is not zero but will be equal to the product of the angular acceleration and the moment of inertia. theoretically, if the object is rotating in a constant speed than the applied net torque is zero (second law of neuton).

What is the net torque if the angular velocity is zero?

If the object is rotating at constant angular velocity, then the net torque is zero. That means the applied torque is exactly equal to the frictional torque. If the angular velocity is not constant, the net torque is not zero but will be equal to the product of the angular acceleration and the moment of inertia.