Advertisements
Advertisements
प्रश्न
State two conditions when the work done by a force acting on a body is zero.
Advertisements
उत्तर
(i) When there is no displacement by the force in the body.
(ii) When the displacement is normal to the direction of the force.
संबंधित प्रश्न
State the condition when a body is in dynamic equilibrium.
State the principle of moments. Give one device as an application of it
A meter scale is pivoted at its mid point and a 50 g mass suspended from the 20 cm mark. What mass balances the ruler when suspended from 65 cm mark?
What makes a balance faulty?
The arms of a beam balance are 20 cm and 21 cm, but the pans are of equal weight. By the method of double weighing the weights are found to be 1000 g and 20 g. Find the actual weight of the body
State the principle of moments.
Explain why It is easier to knock down a boy who is standing on one foot than one who is standing on two.
Explain when we carry weight, on one hand, we bend on the other side.
A ball is placed on a compressed spring. When the spring is released, the ball is observed to fly away.
(i) What form of energy does the compressed spring possess?
(ii) Why does the ball fly away?
Give one example of dynamic equilibrium.
