Question

3.Explains how the conservation of momentum is a consequence of Newton 's third law .

4.In a common example happens daily, the following cases:

a) An object that has zero rotational kinetic energy but its translational kinetic energy is not zero. b) An object that has zero translational kinetic energy but its rotational kinetic energy is not zero. c) An object that has neither rotational and translational kinetic energy.

5.An example of a system without net torque, but not zero net force.

6.Give an example of a system that has zero net force, but its net torque is not zero.

Answer 1

3.)

Remember that Newton's Second Law says that Force = mass × acceleration. Since acceleration is the change in velocity per unit time, F ∝ mΔv, which is to say that force is proportional to change in momentum.

Newton's Third Law says that every force is balanced by an equal and opposite reaction force. Since force is proportional to change in momentum, a change in momentum must also be balanced by an equal and opposite change in momentum. Hence, the conservation of momentum is a consequence of Newton's Third Law.