TEXTBOOK EVALUATION

Deduce the equation of a force using Newton’s second law of motion.

State and prove the law of conservation of linear momentum.

Describe rocket propulsion.

State the universal law of gravitation and derive its mathematical expression.

Give the applications of universal law gravitation.

Two blocks of masses $8 \mathrm{kg}$ and $2 \mathrm{kg}$ respectively lie on a smooth horizontal surface in contact with one another. They are pushed by a horizontally applied force of $15 \mathrm{N}$. Calculate the force (in newton) exerted on the $2 \mathrm{kg}$ mass.

A heavy truck and bike are moving with the same kinetic energy. If the mass of the truck is four times that of the bike, then calculate the ratio of their momenta.

“Wearing helmet and fastening the seat belt is highly recommended for safe journey”. Justify your answer using Newton’s laws of motion.