Physics · Science General

Newtonian Mechanics and Forces

1,605 Questions

Newtonian mechanics studies the motion of objects and the physical laws governing them. This hub covers friction, gravitational force, inertia, and vector quantities. Mastering these fundamental physics concepts is essential for various government competitive exams.

Laws of motionFriction and inertiaVector and scalar quantitiesGravitational accelerationArchimedes principle

Newtonian Mechanics and Forces Questions

Multiple choice

When a horse starts suddenly, the rider falls backwards. Which of the following reasons is true for this reaction?

  1. Due to the inertia of rest of the upper part of the rider's body

  2. Due to the inertia of rest of the upper part of the horse's body

  3. Due to the inertia of rest of the lower part of the rider's body

  4. Due to the inertia of rest of the lower part of the horse's body

  5. Due to the backward push of the air
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

.

Multiple choice

A forward slip makes sure that the speed

  1. increases rapidly

  2. decreases rapidly

  3. does not increase much

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a forward slip, the increased drag from the sideways airflow prevents speed from building up rapidly while descending. The slip creates a high-drag configuration that allows steep descent without significant airspeed increase, which is essential for maintaining control while losing altitude quickly.

Multiple choice

Performing a slip ____ the drag.

  1. reduces

  2. increases

  3. has no effect on

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Performing a slip increases drag significantly because the aircraft is presented sideways to the relative airflow. This increased drag is what allows a slip to be effective for losing altitude without gaining excessive airspeed. The high-drag configuration is useful for steep descents and approach corrections.

Multiple choice

The heading indicator works on the principle of ____ of gyros.

  1. precession

  2. rigidity

  3. both (1) and (2)

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The heading indicator (directional gyro) operates on the principle of gyroscopic rigidity - a spinning gyroscope maintains its axis of rotation in space. This rigidity allows it to maintain a fixed reference direction as the aircraft turns. While some gyroscopic instruments use precession (like the turn coordinator), the heading indicator primarily relies on rigidity to maintain its heading reference, with precession only used for mechanical correction purposes.

Multiple choice

AI works on the principle of ____ of gyros.

  1. rigidity

  2. precession

  3. both (1) and (2)

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The attitude indicator operates on the principle of gyroscopic rigidity. The gyroscope in the AI maintains a fixed orientation in space due to rigidity, while the aircraft rotates around it. The gimbal system allows the gyroscope to remain stable while the aircraft case moves, providing a reliable artificial horizon reference for both pitch and bank information.

Multiple choice

Which of the following statements is/are incorrect for energy?

(i) Energy is destroyed due to frictional forces. (ii) Energy is the measure of the ability to do work. (iii) Energy and power both measure the same quantity.

  1. Only (i)

  2. Only (ii)

  3. Only (i) and (ii)

  4. Only (i) and (iii)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement (i) is incorrect. According to law of conservation of energy, ‘Energy can neither be created nor destroyed’. Statement (ii) is correct. Energy is defined as the ability to do work. Statement (iii) is also incorrect. Energy measures the ability to do work, while ‘power’ is the time rate at which work is done or energy is transferred.