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 sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

"The motion of a particle with a restoring force gives oscillatory motion". Which of the following forces can be a restoring force for the oscillatory motion.

  1. Frictional force

  2. A constant force F

  3. A time varying force opposite to direction of motion

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

Frictional force is a constant force acting opposite to the direction of motion
A constant force only makes an object to move in one direction
A time varying force makes an object to move in one direction with its speed increasing
Force due to a spring, keeps varying, as the object is moved away from its mean position and thus acts as a restoring force

The correct option is (d)

Multiple choice physics sound: production of sound oscillation - amplitude, time period and frequency of oscillation time period, frequency and amplitude of sound oscillatory and periodic motion

Which of the following conditions must be satisfied for a body to oscillate or vibrate?
A: The body must have inertia to keep it moving across the mid point of its path.
B: There must be a restoring force to accelerate the body towards the midpoint.
C: The fractional force acting on the body against its motion must be small.

  1. Only A

  2. Only A and B

  3. Only B and C

  4. All A, B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oscillatory motion requires inertia (to overshoot the equilibrium), a restoring force (to return to equilibrium), and minimal friction (to prevent rapid damping).

Multiple choice evs - i our earth and our solar system sunita's experience in space space exploration solar system and sun

What will happen if you place a cup on a table in space?

  1. It will remain stationary at its position

  2. It will start vibrating and break eventually

  3. It will rise up as soon as you remove your hand from the cup

  4. It will slide sideways on the table
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

There is no gravity is space which means no downward gravitational force acts on the object kept in space. Thus as soon as we remove our hand from the cup, no gravitational force acts on it to keep it stationary on the table and hence the cup rises upwards.

The correct answer is option C.

Multiple choice evs - i our earth and our solar system sunita's experience in space space exploration solar system and sun

What will happen if you place a cup on an inclined surface in space?

  1. It will slide along the surface

  2. It will rise up vertically

  3. It will rise perpendicular to the plane of the inclined surface

  4. It will remain stationary at its position
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

As there is no gravity is space, thus no gravitational force acts on the cup kept in space. The only force acting on the cup placed on the inclined surface is the normal reaction exerted by the inclined surface (perpendicular to the plane of inclined surface) which makes the cup to rise in the direction perpendicular to the plane of inclined surface.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Which of the following is not a basic physical quantity?

  1. Length

  2. Force

  3. Time

  4. Amount of substance
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The physical property of a body, substance or phenomenon that can be quantified by measurement is defined as a physical quantity.

There are seven fundamental physical quantities viz. time, length, mass, amount of substance, luminous intensity, temperature, and electric current.
Here force is a derived unit.
Thus the correct answer is force.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Weight of a body is:

  1. constant

  2. not constant

  3. does not change from place to place

  4. both A and C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mass of a body is constant whereas weight of a body depends on the acceleration due to gravity at that point. Therefore, weight of body is not constant & varies from place to place.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Kelvin scale has:

  1. no fixed points

  2. one fixed point.

  3. two fixed points

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

In Kelvin scale, temperature is expressed in Kelvin. In SI system, Kelvin is the unit of temperature. In this scale of temperature, zero of the scale corresponds to $-273^0C$, which is said to be the temperature at which the volume of a gas reduces to zero. Hence, $-273^0C$ is also known as the absolute zero. For the same reason, this scale of temperature is also known as absolute scale of temperature. On this scale, the lower fixed point i.e. the temperature of melting ice at normal pressure is +273K and the upper fixed point i.e. the temperature of boiling water at normal pressure is 373K. 

Multiple choice physics force and newton's laws momentum (p) introduction to momentum linear momentum

Momentum is a measure of 

  1. Weight

  2. Mass

  3. Quantity of motion

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

Momentum is mass* velocity.

For motion two questions are important, " How much is moving? " and "How fast is it moving?'
For change in state, inertia is necessary. Inertia is mass for translational motion. 
So, Quantity of motion is momentum.

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

If the same force is applied on two bodies of different masses for the same time, then the change produced in the momentum of the two bodies is also same .

  1. True

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

According to Newton's second law,

F = ma = m (v - u)/ t
Ft = mv - mu = Change in momentum
Now, for two bodies, if Ft is same, change in momentum is also same.
So, given statement is true.

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

Which of the following statements are correct regarding linear momentum of a body?

  1. It is a measure of quantity of motion contained by the body.

  2. Change in momentum is the measurement of impulse.

  3. Impulse and acceleration act in same direction to the change in momentum.

  4. Incase of uniform circular motion, the linear momentum is conserved.
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Momentum, P = Mv

So, it gives quantity of motion. Option A is correct.
By Newton's second law,
Ft = mv-mu, So option B is correct.
The direction of impulse can be opposite to that of change in momentum. Option C is wrong.
The Uniform circular motion is accelerated motion. So, momentum is not conserved.
Option D is wrong.
Hence, Options A and B are correct.

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

Momentum is closely related to:

  1. force

  2. impulse

  3. velocity

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

Momentum of an object is due to its mass and velocity. m x v = momentum. Mass remains constant for any object. The value of momentum mostly depends on the value of velocity. Thus, velocity out of the four options is closely related to momentum.

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

If the acceleration of an object is zero:

  1. it must be at rest

  2. it may or may not be at rest

  3. it must be moving

  4. it must be falling freely under gravity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

From newton's  2nd law of motion, the zero acceleration implies no external force, however, the body may have uniform velocity.

Hence the body may or may not be at rest.