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 physics rigid body dynamics motion of rigid body rigid body equilibrium of a rigid body

Which of the following cannot be considered an example of precession?

  1. A spinning top

  2. A spinning wheel

  3. Rolling ball

  4. Spinning of the earth
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Spinning of top, spinning wheel and spinning of the earth are purely rotational motion whereas rolling ball exhibits both rotational motion as well as translational motion. As precession is described by rotational motion only, thus rolling of ball cannot be considered as an example of precession.

Multiple choice physics rigid body dynamics motion of rigid body rigid body equilibrium of a rigid body

Ram says, $'A$ body may be in pure rotation in the presence of a single external force, 'Shyam says, 'This is possible only for a rigid body', then:

  1. Ram's statement is correct

  2. both statements are correct in different situations

  3. both statements are wrong

  4. both statements are stated by physicists
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A single external force acting on a body will cause both translational and rotational acceleration if the line of action does not pass through the center of mass. A body can be in pure rotation only if the net force is zero or if the body is constrained (like a hinge), so Ram's statement is incorrect. Shyam's statement is also incorrect because pure rotation is not exclusive to rigid bodies, and a rigid body can still undergo translation under a single force.

Multiple choice physics rigid body dynamics motion of rigid body rigid body equilibrium of a rigid body

Any point on the circumference of a rigid body which is rolling without slipping undergoes :

  1. a circular path

  2. an elleptic path

  3. a cycloid path

  4. an parabolic path
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Any point on the rigid body, undergoing rolling without slipping, will have linear and angular speed, such that

$linear\ speed = distance\ from\ CoM \times angular\ speed$

Such particles follows cycloid path.

Multiple choice physics rigid body dynamics motion of rigid body rigid body equilibrium of a rigid body

Rolling without slipping is an example of

  1. Rotation

  2. Translation

  3. Rotation with translation

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

When a body is rolling without slipping on the ground, its center of mass exhibits translational motion whereas the body exhibits rotational motion in its center of mass frame. Thus rolling body exhibits both translational motion as well as rotational motion.

Multiple choice physics force and newton's laws of motion concept of inertia galileo's law and inertia mass and inertia

While dusting a carpet, we give a sudden jerk or beat with a stick because :

  1. Inertia of rest keeps the dust in its position and the dust is removed by movement of carpet away.

  2. Inertia of motion removes dust.

  3. No inertia involved in process.

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

When carpet is given sudden jerk, due to inertia dust particles does not change position, while carpet moves.

Thus dust particles gets separated from carpet.
So, Option A is correct.