Question

Q.1) State true or false

1) The chair made up of fiber requires less force to be moved as that required by the steel bench.


2) The boat moves in the same direction as the person jumping out.
Q.2)


a) State the law of conservation of momentum.

b) Explain the above law with a suitable example. ​

Answer 1

Answer:

1 - TRUE

2- FALSE

3- The conservation of momentum states that, within some problem domain, the amount of momentum remains constant; momentum is neither created nor destroyed, but only changed through the action of forces as described by Newton's laws of motion. ... Momentum is conserved in all three physical directions at the same time.

4- A ballet dancer makes use of the law of conservation of angular momentum to vary her angular speed. When she suddenly folds her arms and brings the stretched leg close to the body, her angular velocity increases on account of the decrease in moment of inertia. This helps in rotating safely on her legs.