Physics ยท 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

What is the force that causes objects to fall towards the Earth?

  1. Gravitational force

  2. Electromagnetic force

  3. Strong nuclear force

  4. Weak nuclear force
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The gravitational force is responsible for the attraction between objects with mass, causing them to fall towards each other.

Multiple choice

Which scientific principle is used to create the illusion of movement in a painting?

  1. The Law of Conservation of Energy

  2. The Law of Thermodynamics

  3. The Law of Motion

  4. The Law of Gravity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The Law of Motion is used to create the illusion of movement in a painting. This principle states that an object in motion will remain in motion unless acted upon by an external force.

Multiple choice

What is length contraction?

  1. The shortening of objects in the direction of their motion relative to stationary observers.

  2. The lengthening of objects in the direction of their motion relative to stationary observers.

  3. The phenomenon where objects appear shorter in stronger gravitational fields.

  4. The phenomenon where objects appear longer in stronger gravitational fields.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Length contraction is another consequence of Special Relativity, where moving objects appear shorter in the direction of their motion relative to an observer at rest.

Multiple choice

Which of the following is NOT a type of flow resistance encountered in external flows?

  1. Skin friction

  2. Form drag

  3. Wave drag

  4. Induced drag
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Induced drag is a type of aerodynamic drag generated by the lift produced by an airfoil. It is not encountered in external flows in the context of fluid mechanics.

Multiple choice

What is the name of the law that states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force?

  1. The law of inertia

  2. The law of acceleration

  3. The law of action and reaction

  4. The law of universal gravitation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The law of inertia is the first law of motion and it states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Multiple choice

What is the name of the law that states that the acceleration of an object is directly proportional to the net force acting on the object, and inversely proportional to the mass of the object?

  1. The law of inertia

  2. The law of acceleration

  3. The law of action and reaction

  4. The law of universal gravitation
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The law of acceleration is the second law of motion and it states that the acceleration of an object is directly proportional to the net force acting on the object, and inversely proportional to the mass of the object.

Multiple choice

What is the name of the law that states that for every action, there is an equal and opposite reaction?

  1. The law of inertia

  2. The law of acceleration

  3. The law of action and reaction

  4. The law of universal gravitation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The law of action and reaction is the third law of motion and it states that for every action, there is an equal and opposite reaction.

Multiple choice

What is the name of the law that states that the force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them?

  1. The law of inertia

  2. The law of acceleration

  3. The law of action and reaction

  4. The law of universal gravitation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The law of universal gravitation is the law that states that the force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

Multiple choice

Which of the following is not a type of force?

  1. Gravitational force

  2. Magnetic force

  3. Electrostatic force

  4. Nuclear force
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nuclear force is a type of interaction between subatomic particles, not a type of force.

Multiple choice

In fluid dynamics, the force acting on a fluid particle due to the pressure gradient is described by:

  1. Bernoulli's equation

  2. Navier-Stokes equations

  3. Euler's equation

  4. Poiseuille's equation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Euler's equation is a fundamental equation in fluid dynamics that describes the force acting on a fluid particle due to the pressure gradient.

Multiple choice

Which mathematical concept is used to describe the rate of change of a function?

  1. Derivative

  2. Integral

  3. Limit

  4. Vector
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The derivative of a function represents the instantaneous rate of change of the function at a given point.

Multiple choice

The phenomenon where objects appear to shrink in length when moving at high speeds is known as:

  1. Time dilation

  2. Length contraction

  3. Gravitational time dilation

  4. Special relativity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Length contraction is another consequence of the principle of relativity and has also been experimentally verified.

Multiple choice

What is the principle of equivalence?

  1. The principle that all objects fall at the same rate in a gravitational field

  2. The principle that the laws of physics are the same for all observers in uniform motion

  3. The principle that the speed of light is the same for all observers

  4. The principle that energy and mass are equivalent
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The principle of equivalence is the principle that all objects fall at the same rate in a gravitational field. This principle is one of the cornerstones of general relativity.

Multiple choice

Which type of balance involves placing elements of equal visual weight on opposite sides of the frame?

  1. Radial balance

  2. Asymmetrical balance

  3. Symmetrical balance

  4. Reflective balance
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Symmetrical balance involves placing elements of equal visual weight on opposite sides of the frame, creating a mirror-like effect. This type of balance is often used to create a sense of order and harmony within the image.

Multiple choice

What is the principle of least action in the calculus of variations?

  1. The principle that states that the action of a physical system is always a minimum.

  2. The principle that states that the action of a physical system is always a maximum.

  3. The principle that states that the action of a physical system is always constant.

  4. The principle that states that the action of a physical system is always zero.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The principle of least action states that the action of a physical system is always a minimum, and this principle is used to derive the equations of motion for the system.