Newton Laws | MCQs

Explanation

When a book is stationary, the upward normal force from the table equals the downward gravitational force.

These balanced forces result in no motion, keeping the book at rest.

Explanation

As a rocket moves upward, its acceleration increases continuously. 

This is because as the rocket burns fuel and expels exhaust gases, its mass decreases.

According to Newton's second law of motion (F = ma), with a constant force (the engine's thrust), a decreasing mass results in an increasing acceleration. 

Explanation

In ideal projectile motion, gravity is the only significant force acting downward on the object.

Air resistance is usually neglected, so gravitational force controls the curved path.