Why is torque zero at pivot point?

This is due to the definition of the moment arm, which is the distance between the pivot point and the point where the force acts. If the force acts right on the pivot point, then r=0, so there would be no torque.

When the line of action of force passes through the axis the torque produced about it’s axis is?

↪️Torque↩️ When torque of a force passes through axis of rotation then torque becomes zero (0).

When the line of action of the applied force passes through the pivot point then its torque is?

In Fig. 3c the line of action of the force passes through the pivot point. In this case the lever arm is zero and therefore the torque will be zero as well. F .

When the line of action of force passes through pivot point then the moment arm will be?

A moment causes a rotation about a point or axis. If the moment is to be taken about a point due to a force F, then in order for a moment to develop, the line of action cannot pass through that point. If the line of action does go through that point, the moment is zero because the magnitude of the moment arm is zero.

What happens when torque is zero?

If the net torque on a rotatable object is zero then it will be in rotational equilibrium and not able to acquire angular acceleration.

What will be the magnitude of torque if the line of action of force passes through point of rotation give reason for your answer?

4) When the line of action of a force passes through the point about which torque is to be calculated, (a) that force does not generate any torque (b) that force either pulls that point or pushes it (c) both a & b.

What is line of action of force in torque?

The line of action of a force is an imaginary line of indefinite length drawn along the direction of the force. The moment arm of a force is the perpendicular distance from the line of action of a force to the axis of rotation.

How can torque be 0?

An applied force can result in zero torque if there is no lever arm or the applied force is parallel to the lever arm (see Figure 3 and 4 below).

How do you know if the torque is zero?

Whenever that happens there is also an angular or rotational acceleration. The absence of such an acceleration is an indication that the net torque was zero. By symmetry the torque is equal but opposite when the line of action of the force is respectively one foot to the left of the pivot point and one foot to the right.

When torque is equal but opposite to force?

By symmetry the torque is equal but opposite when the line of action of the force is respectively one foot to the left of the pivot point and one foot to the right. As you move the two lines of action closer to the pivot point the torques decrease while remaining equal but opposite.

What is the distance from the pivot perpendicular to force?

In this case, the perpendicular distance is the length of the bar and the torque is equal to the product of the length and the force. In Example 2, the same force is applied to the arm, but the force now acts right through the pivot. In this case, the distance from the pivot perpendicular to the force is zero.

Why is there no rotational acceleration when the torque is zero?

You are exerting a force at a distance from the potential axis of rotation, but no rotational acceleration takes place. That’s a torque of zero. Non-zero net torques produce changes in angular momenta. Whenever that happens there is also an angular or rotational acceleration.