Answer the following :
Why can our elbow not move backwards?

Answer the Why can our elbow not move backwards?

Which one of the following birds can rotate its neck backwards to a large extent ?

Which of the following is not the cause of backwardness ?

Answer the following questions: Why does. a current-carrying wire cause a compass needle to move?

Answer the following briefly. ( Answer should not be of more than one or two line ) (i) Can friction coeffiecient be greater than unity ? (ii) Why is friction force Nonconservation force ? (iii) Can frictio do positive work ? (iv) Is earth an inertial frace ? (v) Greater force is required to make the body move than to keep it moving, hence we can say that static friction is always greater than kinetic friction. Comment on it. (vi) Lesser force is required to pull a lawn than to push it. Why ?

Which one of the following equilibrium moves backward when pressure is applied ?

Int the following acid-base reaction, in which can backward reaction if favoured ?