Physics ยท 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

The force that keeps an object moving in a circular path is called:

  1. Centripetal force

  2. Centrifugal force

  3. Gravitational force

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

Centripetal force is the force that acts on an object in circular motion, directed toward the center of the circle, keeping it moving in that path.

Multiple choice

In a horizontal circular motion, the normal force is:

  1. Equal to the weight of the object

  2. Greater than the weight of the object

  3. Less than the weight of the object

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

In a horizontal circular motion, the normal force is greater than the weight of the object to provide the necessary centripetal force.

Multiple choice

What are the main forces acting on an offshore structure?

  1. Gravity

  2. Wind

  3. Waves

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The main forces acting on an offshore structure are gravity, wind, and waves.

Multiple choice

What is a symplectic vector field?

  1. A vector field that preserves the symplectic form.

  2. A vector field that is tangent to the symplectic foliation.

  3. A vector field that is Hamiltonian.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A symplectic vector field is a vector field that preserves the symplectic form, is tangent to the symplectic foliation, and is Hamiltonian. These three conditions are equivalent.

Multiple choice

In a game, a player character is running at a speed of 5 m/s. The player character encounters a wall and comes to a sudden stop. What is the force that the wall exerts on the player character?

  1. 5 N

  2. 10 N

  3. 15 N

  4. 20 N
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The force that the wall exerts on the player character can be calculated using the equation: F = ma, where F is the force, m is the mass of the player character, and a is the acceleration of the player character. Since the player character comes to a sudden stop, the acceleration is equal to the initial velocity divided by the time it takes to stop. Assuming that the time it takes to stop is very small, the acceleration can be approximated as infinite. Therefore, the force that the wall exerts on the player character is infinite.

Multiple choice

Which of the following is an example of gravitational potential energy?

  1. A book resting on a table

  2. A stretched rubber band

  3. A battery

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

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field. A book resting on a table is an example of gravitational potential energy because it has the potential to fall and release its energy.

Multiple choice

Which of the following is an example of elastic potential energy?

  1. A book resting on a table

  2. A stretched rubber band

  3. A battery

  4. A flowing river
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Elastic potential energy is the energy an object possesses due to its deformation. A stretched rubber band is an example of elastic potential energy because it has the potential to release its energy when it is released.

Multiple choice

What is the potential energy of an object at rest on the ground?

  1. Zero

  2. Positive

  3. Negative

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

The potential energy of an object at rest on the ground is zero. This is because the object has no height above a reference point, and therefore no gravitational potential energy.

Multiple choice

What is the name of the principle that states that the total amount of momentum in an isolated system remains constant?

  1. Conservation of energy

  2. Conservation of mass

  3. Conservation of momentum

  4. Conservation of angular momentum
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The principle of conservation of momentum states that the total amount of momentum in an isolated system remains constant, regardless of the changes that occur within the system.

Multiple choice

Which of the following is a conserved quantity in the absence of external torque?

  1. Linear momentum

  2. Angular momentum

  3. Energy

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

In the absence of external torque, angular momentum is a conserved quantity. This means that the total angular momentum of a system remains constant.

Multiple choice

Which of the following is NOT a method for changing the angular momentum of an object?

  1. Applying a torque

  2. Changing the moment of inertia

  3. Changing the angular velocity

  4. Changing the mass of the object
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The mass of an object does not affect its angular momentum. Angular momentum can be changed by applying a torque, changing the moment of inertia, or changing the angular velocity.

Multiple choice

Aristotle's theory of motion distinguishes between:

  1. Natural motion and violent motion

  2. Circular motion and rectilinear motion

  3. Potential motion and actual motion

  4. Substantial motion and accidental motion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aristotle's distinction between natural and violent motion is central to his understanding of motion and change.

Multiple choice

Which of the following is NOT a method to reduce damping in forced harmonic motion?

  1. Using a viscous damper

  2. Using a spring with low stiffness

  3. Using a material with high internal friction

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

Using a material with high internal friction increases damping, not reduces it.

Multiple choice

Which of the following is NOT a fundamental force studied in astrophysics?

  1. Electromagnetism

  2. Gravity

  3. Nuclear Force

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

Friction is not a fundamental force in astrophysics. The fundamental forces are electromagnetism, gravity, and the nuclear force.

Multiple choice

What is the most common force used to simulate gravity in particle systems?

  1. Spring Force

  2. Damping Force

  3. Attraction Force

  4. Inverse Square Force
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The inverse square force is commonly used to simulate gravity in particle systems because it accurately models the gravitational force between particles.