Question

Explain pls legible.
4. Torque and energy have the same dimension. Does this mean they can be added to each other? Explain.

5. Does a rigid body have to be moving to have a non-zero moment of inertia? Explain.

6. Why do divers tuck in their limbs while turning multiple revolutions during a dive?

Answer 1

Q4 .

Ans. No, we can not add them.

Since

     Work is a transfer of energy to an object as a result of an applied force and the displacement that occurs while the force is being applied. But it is only the component of force in the direction of the displecement that matters. The component of force perpendicular to the displacement does not transfer any energy.

Torque is associated with a force which tends to rotate an object about a point of reference . An applied torque does not necesarily cause rotation In torque , the force involved is the component of force perpendicular to the line connecting the reference point to the point of application of the force and the distance is from that reference point to the point of aplication of the force.

So the torque and work are different but both involve some force and some distance and the product of the two, so they both have the units of the product of force and displecement.