Physics · 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 physics along with motion motion around us motion and rest moving things around us

What is corrct statement about impulse?

  1. change in velocity

  2. change in momentum due to force in small time

  3. change in acceleration

  4. change in speed
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Impulse:- It is defined as a change in momentum due to force in small time.

Mathematically, 
From Newton's law,
$F=\dfrac{\Delta p}{\Delta t}$
Impulse, $I=F\times \Delta t=\Delta P$
The correct option is B.

Multiple choice physics along with motion motion around us motion and rest moving things around us

 A person in a car tends to fall back when it suddenly starts. It is due to

  1. Inertia of rest

  2. Inertia of motion

  3. Inertia of direction

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

when bus suddenly start moving in forward direction. This happens due to. When a bus suddenly starts, the standing passengers fall backward in the bus.

It is due to inertia of rest.
Hence,

option $A$ is correct answer.

Multiple choice physics along with motion motion around us motion and rest moving things around us

If the forces acting on an object are balanced, then_____

  1. the object will be in equilibrium

  2. the object will be in motion

  3. the object will have zero acceleration

  4. the object loses its shape
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

according to newton's first law of motion, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

so if forces acting on the object is balanced then the object will be in equilibrium and it will not have any acceleration.
cannot comment about option B because if initially object is at rest then it will be always at rest .
so best possible answer are option A,C.

Multiple choice forces on solids elastic and plastic substances forces and matter properties of matter physics

When the inter molecular distance increases due to tensile force, then 

  1. There is no force between the molecules

  2. There is a repulsive force between the molecules

  3. There is an attractive force between the molecules

  4. There is zero resultant force between the molecules
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Intermolecular forces are attractive at larger distances and repulsive at very short distances. When a tensile force increases the distance, the molecules are pulled apart, and the intermolecular force acts to restore the equilibrium, which is an attractive force.

Multiple choice physics fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

Hydraulic press works on the principle of Pascal's principle

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pascal law states that any increment in pressure applied to the enclosed fluid is transmitted undiminished at each pt of the fluid and the walls of the container.

and  hydraulic press works on the principle of pascal law 
so option (A) is correct.

Multiple choice physics fluid pressure examples of hydraulic press applications of pascal's law pascal's law and its applications

Lifting automobiles in service stations is based on the principle of ________.

  1. Apparent pressure

  2. Hydraulic pressure

  3. Atmospheric pressure

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Lifting automobiles in service stations is based on the principle of Hydraulic pressure .

hydraulic press is based on the pascal law .
so option (B) is correct

Multiple choice lorentz transformation and muon experiment option a: relativity physics
The best definition for space contraction ?

  1. The length of an object decreases in the same direction it is moving.

  2. All dimensions of an object decrease at high speeds.

  3. The length of an object increases in the same direction it is moving.

  4. Both length and width, but not depth, decrease at high speeds.

  5. Space is constant regardless of its location or state of motion.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When an object is moving relative to an observer, the length of the object as observed by a moving observer is less than that observed by a stationary one in the direction of the movement.

Multiple choice physics kirchhoff's law circuit problems kirchoff's law and problems on it equivalent resistance in series and parallel connection

Kirchoffs 1st and 2nd laws are based on conservation of

  1. Energy and charge respectively

  2. Charge and energy respectively

  3. Mass and charge respectively

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

Kirchhoff's $1$st law states that the total amount of current coming at a junction must be equal to the total amount of current going away from it i.e. the total charge must be conserved. Thus Kirchhoff's $1$st law is based on the conservation of charge.

Kirchhoff's $2$nd law states that the sum of the potential drop across all the components in a loop must be zero. Thus Kirchhoff's $2$nd law is based on the conservation of energy.

Multiple choice physics energy and its forms introduction to work work introduction to work and energy

No work is done by a force on an object if 

  1. the force is always perpendicular to its velocity

  2. the force is always perpendicular to its acceleration

  3. the object is stationary but the point of application of the force moves on the object

  4. the object moves in such a way that the point of application of the force remains fixed.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The work done by a force F in displacing a particle through d is:
$W=\vec{F}\cdot \vec{d}=Fd\cos \theta$
If $\theta =90^o$
$W=Fd\cos 90^o=0$
Now direction of displacement is same as the direction of velocity.
So if force is always perpendicular to the velocity then no work is done.
Multiple choice relativistic mechanics option a: relativity physics

Length contraction happens only __________________.

  1. perpendicular to direction of motion

  2. along direction of motion

  3. both a and b

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to the theory of special relativity, length contraction occurs only in the direction of the relative motion between the observer and the object.

Multiple choice relativistic mechanics option a: relativity physics

Special theory of relativity treats problems involving :

  1. inertial frame of reference

  2. non-inertial frame of reference

  3. non-accelerated frame of reference

  4. accelerated frame of reference
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Einstein’s special theory of relativity is also based on two postulates, the constancy of the speed of electromagnetic radiation and the validity of physical laws in all inertial frame of reference
Multiple choice relativistic mechanics option a: relativity physics

According to special theory of relativity which one is not an absolute quantity?

  1. time

  2. mass

  3. height

  4. both a and b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
According to classical physics time and mass are not an absolute quantity