Question

The turning effect of force is maximum when the angle between and is

Answer 1

Maximum when the two forces combine together in the same direction, angle = 0 degrees.

Answer 2

Answer:

The turning effect of force is maximum when the angle between 'r' and 'F' is equal to 90°.

Explanation:

• Turning effect of force is called torque. Turning effect of force gives direction of force which is responsible for the a body rotates about its own axis.
• Turning effect of force or torque (τ) is equal to the cross product of force vector and position vector.

Consider that 'r' is the position vector and 'F' is the force, Then torque will be equal to:

$\vec{\big \tau} = \vec {\big r}$× $\vec {\big F}$

The magnitude of torque or turning effect of force:

τ = r F sinθ

Now, sinθ = 1 when, θ = 90° therefore,

τ = r F sin90°

τ = r F

Therefore, the turning effect of force is maximum, when the position vector is placed at right angles to the direction of force.