Question

a door will not move if we apply force in the direction of arm length. why?​

Answer 1

Explanation:

The point is that because the door is attached a hinge, the ONLY force you can exert on the door is a rotative force, which is measured in torque. Torque is proportional to the distance from the rotation axis to the point where the force is exerted. So if you push linearly (perpendicular to the door) with the same force at the end of the door (distance to hinge = 1m), and then right next to the hinge (distance to hinge = 0.05m), the push near the hinge will generate far less torque, since your original force will be multiplied by 0.05, ie. only 5% of your linear force is rotating the door.

mark me as brainleast

Answer 2

REASON IS THAT

Explanation:

the door is attached a hinge, the ONLY force you can exert on the door is a rotative force, which is measured in torque. Torque is proportional to the distance from the rotation axis to the point where the force is exerted. ... only 5% of your linear force is rotating the door