Physics · Science General

Newtonian Mechanics and Forces

1,559 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

Which law of motion states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity, unless acted upon by an external force?

  1. Newton's First Law of Motion

  2. Newton's Second Law of Motion

  3. Newton's Third Law of Motion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Newton's First Law of Motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity, unless acted upon by an external force.

Multiple choice

What is the relationship between the force acting on an object, its mass, and its acceleration, according to Newton's Second Law of Motion?

  1. Force = Mass * Acceleration

  2. Force = Acceleration / Mass

  3. Force = Mass / Acceleration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Newton's Second Law of Motion states that the force acting on an object is equal to the product of its mass and its acceleration.

Multiple choice

For every action, there is an equal and opposite reaction, according to Newton's Third Law of Motion. What does this mean?

  1. When one object exerts a force on another object, the second object exerts a force of equal magnitude but opposite direction on the first object.

  2. When two objects collide, the forces they exert on each other are always equal in magnitude and opposite in direction.

  3. The force exerted by an object on another object is always greater than the force exerted by the second object on the first object.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object exerts a force of equal magnitude but opposite direction on the first object.

Multiple choice

A 10-kg object is acted upon by a force of 20 N. What is the object's acceleration?

  1. 2 m/s²

  2. 4 m/s²

  3. 6 m/s²
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using Newton's Second Law of Motion, F = ma, we can solve for acceleration: a = F/m = 20 N / 10 kg = 2 m/s².

Multiple choice

Which of the following factors does NOT affect the velocity of a projectile?

  1. Air resistance

  2. Gravitational acceleration

  3. Mass of the projectile

  4. Initial velocity
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The mass of the projectile does not directly affect its velocity. Air resistance, gravitational acceleration, and initial velocity all influence the velocity of a projectile.

Multiple choice

Which of the following is NOT a type of ballistic trajectory?

  1. Flat trajectory

  2. Curved trajectory

  3. Parabolic trajectory

  4. Hyperbolic trajectory
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hyperbolic trajectory is not a type of ballistic trajectory. Flat trajectory, curved trajectory, and parabolic trajectory are all types of ballistic trajectories.

Multiple choice

A force of 10 N is applied to an object of mass 2 kg. What is the acceleration of the object?

  1. 2 m/s^2

  2. 5 m/s^2

  3. 10 m/s^2

  4. 20 m/s^2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to Newton's second law of motion, F = ma, where F is the force applied, m is the mass of the object, and a is the acceleration. Therefore, the acceleration of the object is 10 N / 2 kg = 5 m/s^2.

Multiple choice

Which of the following is an example of a scalar quantity?

  1. Velocity

  2. Acceleration

  3. Temperature

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

A scalar quantity is a physical quantity that has only magnitude and no direction. Temperature is an example of a scalar quantity because it has only a magnitude (in degrees Celsius, Fahrenheit, or Kelvin) and no direction.

Multiple choice

Which of the following is an example of a vector quantity?

  1. Mass

  2. Volume

  3. Velocity

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

A vector quantity is a physical quantity that has both magnitude and direction. Velocity is an example of a vector quantity because it has both a magnitude (speed) and a direction (the direction in which the object is moving).

Multiple choice

What is the principle of operation of a jet engine?

  1. Newton's Third Law of Motion

  2. Bernoulli's Principle

  3. Conservation of Energy

  4. Conservation of Mass
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A jet engine operates on the principle of Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. The engine pushes air backward, which in turn propels the aircraft forward.

Multiple choice

What is the name of the force that attracts objects towards each other?

  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 force that attracts objects towards each other is called the gravitational force. It is one of the four fundamental forces in nature.

Multiple choice

What is the name of the force that opposes the motion of an object through a fluid?

  1. Drag

  2. Lift

  3. Thrust

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

Drag is the force that opposes the motion of an object through a fluid.

Multiple choice

What is the name of the law that states that the force of gravity is proportional to the mass of the objects?

  1. Newton's First Law of Motion

  2. Newton's Second Law of Motion

  3. Newton's Third Law of Motion

  4. Newton's Law of Universal Gravitation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The law that states that the force of gravity is proportional to the mass of the objects is called Newton's Law of Universal Gravitation.

Multiple choice

What is the rest mass of an object?

  1. The mass of the object when it is at rest

  2. The mass of the object when it is moving

  3. The mass of the object when it is accelerated

  4. The mass of the object when it is in free fall
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The rest mass of an object is the mass of the object when it is at rest. It is a constant value that does not change with the velocity of the object.

Multiple choice

What is the value of the Lorentz factor when an object is at rest?

  1. 0

  2. 1

  3. 2

  4. 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When an object is at rest, the Lorentz factor is equal to 1.