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 geography how seasons occur - part i how seasons occur rotation and calculation of time seasons and time

Direction, inclination of axis and speed are the characteristic of the _____________.

  1. rotation

  2. revolution

  3. inclination

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • In astronomy, axial tilt, also known as obliquity, is the angle between an object's rotational axis and its orbital axis, or, equivalently, the angle between its equatorial plane and orbital plane.
  • It differs from orbital inclination. 
  • At an obliquity of zero, the two axes point in the same direction; i.e., the rotational axis is perpendicular to the orbital plane. 
  • Earth's axis remains tilted in the same direction with reference to the background stars throughout a year .
  • Like Earth, all of the rocky planets have a small precessional rotation of their spin axis.
  • A rotation is a circular movement of an object around a center (or point) of rotation .
  •  A three-dimensional object always rotates around an imaginary line called a rotation axis.
  •  If the axis passes through the body's center of mass, the body is said to rotate upon itself, or spin.
  • The speed of rotation is given by the angular frequency  (rad/s) or frequency  ( turn/s, turns per minute), or period (seconds, days, etc.).
Multiple choice force in shm oscillations oscillation and waves physics

In case of force oscillations of a body

  1. driving force is constant throughout.

  2. driving force is to be applied only momentarily.

  3. driving force has to be periodic and continuous.

  4. driving force is not required.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In case of force oscillations of a body driving force has to be periodic and continuous.

Multiple choice force in shm oscillations oscillation and waves physics

Restoring force in the SHM is

  1. conservative

  2. nonconservative

  3. frictional

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

A conservative force is a force with the property that the work done in moving a particle between two points is independent of the taken path. Restoring force $F=kx,$ is such kind of force and is conservative.

Multiple choice physics forces - vectors and moments the turning of couple couple rotational motion of a rigid body and moment of inertia turning effect of force

A couple produces

  1. Linear motion

  2. Rotational motion
  3. Both $A$ and $B$
  4. Nether $A$ nor $B$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A couple consists of two parallel forces that are equal in magnitude, opposite in sense and do not share a line of action. It does not produce any translation, but only rotational motion.

Multiple choice physics forces - vectors and moments the turning of couple couple rotational motion of a rigid body and moment of inertia turning effect of force

A couple is acting on a two particle systems. The resultant motion will be

  1. Purely rotational motion

  2. Purely linear motion
  3. Both $A$ and $B$

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

A couple consists of two equal and opposite forces whose lines of action are parallel and laterally separated by the some distance. Therefore, net force (or resultant) of a couple is null vector, hence there is no translational acceleration, only rotational motion will be there.

Multiple choice physics forces - vectors and moments the turning of couple couple rotational motion of a rigid body and moment of inertia turning effect of force

In case of torque of a couple, if the axis is changed by displacing it parallel to itself, torque will

  1. Increase

  2. Decrease

  3. Remain constant

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Torque of a couple   $\tau = d\times F$
where  $d$ is the distance between the two equal force $F$
Thus, the distance between the forces remains the same even on changing the axis. So, the torque will remain the same.
Multiple choice physics forces - vectors and moments the turning of couple couple rotational motion of a rigid body and moment of inertia turning effect of force

A couple produces :

  1. no motion

  2. linear and rotational motion

  3. purely rotational motion

  4. purely linear motion
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A couple consists of two equal and opposite forces acting at a separation, so that net force becomes zero. When a couple acts on a body it rotates the body but does not produce any translatory motion. Hence, only rotational motion is produced.

Multiple choice physics forces - vectors and moments the turning of couple couple rotational motion of a rigid body and moment of inertia turning effect of force

While opening a tap with two fingers, the forces applied by the fingers are:

  1. equal in magnitude

  2. parallel to each other

  3. opposite in direction

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

A couple has to be applied to the tap in order to open it. A couple is the combination of two equal and opposite parallel forces acting at different axes. Thus option D is correct.

Multiple choice

Mechanical potential energy depends on what condition?

  1. and object's ability to stretch

  2. and object's ability to compress

  3. and object's position

  4. an object's magnetism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mechanical potential energy depends on an object's position in a force field (gravitational or elastic). The wording in option C is closest, though it has a typo ('and' should be 'an'). Options A, B refer to specific types, and D is unrelated.