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

Which of the following is NOT a fundamental force in physics?

  1. Gravitational Force

  2. Electromagnetic Force

  3. Strong Nuclear Force

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

Frictional force is not a fundamental force in physics. It is an emergent force that arises from the interaction of matter at the macroscopic level.

Multiple choice

What is Length Contraction?

  1. The shortening of objects in the direction of motion.

  2. The lengthening of objects in the direction of motion.

  3. The bending of space-time around massive objects.

  4. The expansion of space-time.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Length Contraction is the phenomenon where objects appear to shorten in the direction of motion when observed from a frame of reference moving relative to the object. This effect is also predicted by Special Relativity and has been experimentally verified.

Multiple choice

What is the principle of relativity?

  1. The laws of physics are the same for all observers in uniform motion.

  2. The laws of physics are different for observers in different inertial frames of reference.

  3. The laws of physics are different for observers in different gravitational fields.

  4. The laws of physics are different for observers moving at different speeds.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The principle of relativity states that the laws of physics are the same for all observers in uniform motion. This means that there is no absolute frame of reference and that all motion is relative.

Multiple choice

What is an inertial frame of reference?

  1. A frame of reference in which Newton's laws of motion hold true.

  2. A frame of reference in which the laws of physics are the same for all observers.

  3. A frame of reference in which the speed of light is constant.

  4. A frame of reference in which time flows at a constant rate.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An inertial frame of reference is a frame of reference in which Newton's laws of motion hold true. This means that an object at rest will remain at rest and an object in motion will continue moving at a constant velocity unless acted upon by an external force.

Multiple choice

What is the force that pulls objects towards the center of the Earth?

  1. Gravity

  2. Magnetism

  3. Electromagnetism

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

Gravity is the force that attracts objects with mass towards each other. It is what keeps us on the ground and causes objects to fall when dropped.

Multiple choice

What is the primary force that opposes the motion of a ship through water?

  1. Gravity

  2. Buoyancy

  3. Drag

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

Drag is the primary force that opposes the motion of a ship through water, acting in the opposite direction of the ship's movement.

Multiple choice

What is the term used to describe the upward force exerted by water on a floating object?

  1. Buoyancy

  2. Upthrust

  3. Hydrostatic force

  4. Archimedes' principle
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Buoyancy is the upward force exerted by water on a floating object, equal to the weight of the water displaced by the object.

Multiple choice

The metacentric height (GM) of a ship is a measure of its:

  1. Stability

  2. Trim

  3. Freeboard

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

Metacentric height (GM) is a measure of a ship's initial stability, indicating its resistance to heeling over when subjected to external forces.

Multiple choice

What is the term used to describe the angle at which a ship tilts when subjected to external forces?

  1. Heel

  2. Trim

  3. List

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

Heel is the angle at which a ship tilts to one side when subjected to external forces, such as wind or waves.

Multiple choice

Which of the following is a type of ship resistance caused by the pressure difference between the front and rear of the hull?

  1. Skin friction resistance

  2. Viscous resistance

  3. Wave-making resistance

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

Pressure resistance is a type of ship resistance caused by the pressure difference between the front and rear of the hull, resulting from the acceleration of water around the hull.

Multiple choice

What is the term for the force exerted by a fluid (such as water) on an object moving through it?

  1. Drag

  2. Lift

  3. Thrust

  4. Resistance
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, caused by the interaction between the object and the fluid.

Multiple choice

What is the term for the force that opposes the motion of an object through a fluid, caused by the pressure difference between the front and back of the object?

  1. Drag

  2. Lift

  3. Thrust

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

Pressure drag is the force that opposes the motion of an object through a fluid due to the pressure difference between the front and back of the object.

Multiple choice

What is the term for the force that opposes the motion of an object through a fluid, caused by the viscous properties of the fluid?

  1. Drag

  2. Lift

  3. Thrust

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

Viscous drag is the force that opposes the motion of an object through a fluid due to the viscous properties of the fluid, causing friction between the object and the fluid.

Multiple choice

What is the primary factor that determines a ship's stability?

  1. Hull shape

  2. Weight distribution

  3. Center of gravity

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

The center of gravity (CG) of a ship is the point at which the entire weight of the ship acts. The stability of a ship depends on the relationship between the CG and the center of buoyancy (CB).

Multiple choice

What is the effect of increasing the GM on a ship's stability?

  1. It increases the ship's stability

  2. It decreases the ship's stability

  3. It has no effect on the ship's stability

  4. It depends on the loading condition
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Increasing the GM increases the ship's initial stability. However, it can also make the ship more tender, which means that it will roll more easily.