Tag: motion of system of particles and rigid bodies

Quizzes (12) Questions (32)

Questions Related to motion of system of particles and rigid bodies

Multiple choice rotational equilibrium option b: engineering physics motion of system of particles and rigid bodies equilibrium physics

The resultant of all the forces acting on the body in static equilibrium should be equal to 

  1. One

  2. Zero

  3. Two

  4. More than one
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The resultant of all the forces acting the body should be equal to zero. The resultant moment of all the forces acting on the body about the point of rotation should be zero.

Multiple choice rotational equilibrium option b: engineering physics motion of system of particles and rigid bodies equilibrium physics

When a body remains in the same state of motion (translational or rotational) under the influence of the applied forces, the body is said to be

  1. Static equilibrium

  2. Dynamic equilibrium

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When a body remains in the same state of motion (translational or rotational) under the influence of the applied forces, the body is said to be dynamic equilibrium.

Multiple choice rotational equilibrium option b: engineering physics motion of system of particles and rigid bodies equilibrium physics

A ball located at the bottom of a spherical deepening is in a state of _________ equilibrium. Fill in the blank. 

  1. Stable equilibrium

  2. Unstable equilibrium

  3. Neutral equilibrium

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

Stable equilibrium means that, with small deviations of the body from this state, forces or moments of forces emerge which tend to return the body to the state of equilibrium. A ball located at the bottom of a spherical deepening is in a state of stable equilibrium.

Multiple choice rotational equilibrium option b: engineering physics motion of system of particles and rigid bodies equilibrium physics

With a small deviation of the body from the equilibrium state, forces emerge which tend to increase this deviation. This state of equilibrium is known as

  1. <span>Stable equilibrium&nbsp;</span>

  2. <span>Unstable equilibrium</span>

  3. <span>Neutral&nbsp;equilibrium&nbsp;</span>

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Unstable equilibrium means that, with a small deviation of the body from the equilibrium state, forces emerge which tend to increase this deviation. A ball located at the top of a spherical projection is an example of unstable equilibrium. 

Multiple choice rotational equilibrium option b: engineering physics motion of system of particles and rigid bodies equilibrium physics

Pencil standing on its point or a stick in vertically standing position is an example of

  1. Stable equilibrium

  2. Unstable equilibrium

  3. Neutral equilibrium

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If a pencil standing vertically is slightly disturbed from its position it will not come back to its original position. This type of equilibrium is called unstable equilibrium, other example of unstable equilibrium are vertically standing cylinder and funnel etc.

Multiple choice rotational equilibrium option b: engineering physics motion of system of particles and rigid bodies equilibrium physics

 When the center of gravity of a body lies below the point of suspension or support, the body is said to be in ________ equilibrium. Fill in the blank. 

  1. Stable

  2. Unstable

  3. Neutral

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

When the center of gravity of a body lies below point of suspension or support, the body is said to be in stable equilibrium. For example a book lying on a table is in stable equilibrium.A book lying on a horizontal surface is an example of stable equilibrium. If the book is lifted from one edge and then allowed to fall, it will come back to its original position.
Other examples of stable equilibrium are bodies lying on the floor such as chair, table etc.

Multiple choice rotational equilibrium option b: engineering physics motion of system of particles and rigid bodies equilibrium physics

The resultant moment of all the forces acting on the body about the point of rotation should be

  1. Greater than one

  2. Smaller than one

  3. Zero

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

The resultant moment of all the forces acting on the body about the point of rotation should be zero, i.e., the sum of the anticlockwise moments about the axis of rotation must be equal to the sum of the clockwise moments about the same axis.

Multiple choice rotational equilibrium option b: engineering physics motion of system of particles and rigid bodies equilibrium physics

In neutral equilibrium,

  1. center of gravity is neither raised nor lowered.

  2. center of gravity is raised .

  3. center of gravity is lowered.

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It's center of gravity is neither raised nor lowered. This means that its center of gravity is at the same height as before this type of equilibrium is known as neutral equilibrium.