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 lever common machines terms related to machines introduction to simple machines

The velocity ratio of a machine is 1 if 

  1. The displacement of load is equal to the displacement of effort

  2. The displacement of load > equal to the displacement of effort

  3. The displacement of load < equal to the displacement of effort

  4. None of the above

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The velocity ratio of a machine is equal to the displacement of effort such a machine changes the direction of effort.

Multiple choice physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

A ball falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.

  1. Potential energy

  2. Kinetic energy

  3. Heat energy

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

After reaching the ground it will not have any height from the ground hence no potential energy as it is defined as virtue of state of its position where as it has velocity by which it can be said that kinetic energy exists as it is defined by virtue of state of its motion.While falling potential energy keeps on changing in kinetic energy and on reaching the ground all potential energy changes to kinetic energy.Hence there exists only kinetic energy.

Multiple choice physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

A moving coin hits another coin and sets it into motion.In this case energy from the moving coin is ---- to the other coin:

  1. Flown

  2. Taken

  3. Not transferred

  4. Transferred
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The moving coin has kinetic energy initially, after hitting the other coin it transfers its kinetic energy to the other coin and sets it in motion.(In reality some part of energy is also lost as heat energy)

Multiple choice physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

When a stone is thrown upwards:

  1. Kinetic energy increases and Potential energy decreases

  2. both Kinetic energy and Potential energy increase

  3. Kinetic energy decreases and Potential energy increases

  4. both remain constant
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a stone is thrown upwards, its velocity decreases and height increases. 

$K.E. = \dfrac{1}{2}{ mv }^{ 2 }$
$P.E. = mgh$
Thus, its kinetic energy decreases and potential energy increases.

Multiple choice physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

Which of the following statement is NOT true?

  1. State of rest of a body is same as the state of zero speed

  2. Human body converts chemical energy into muscular energy

  3. Water in river flows down due to its kinetic energy

  4. Liquids exert pressure on the walls of the container
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Option C is not correct because river flows down due to its gravitational potential energy.

Multiple choice physics the essence of change different forms of energy energy conversions energy transformations and energy transfers

Which of the following statements is correct?

  1. Kinetic energy of a system can be changed without changing the momentum

  2. Kinetic energy of a system cannot be changed without changing its momentum

  3. Momentum of a system cannot be changed without changing its kinetic energy

  4. A system cannot have energy without having momentum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is A

Momentum is a vector quantity while K.E is a scalar quantity ,we can change velocity in such a way momentum remains same but K.E changes .

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

If a body moves back and forth repeatedly about a mean position, it is said to possess 

  1. rotatory motion

  2. projectile motion

  3. oscillatory motion

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

Oscillation is the process of swinging or moving to and fro in a steady, uninterrupted manner, and oscillatory motion is the movement created by the process.

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

Swinging of table fan is an example of which type of motion?

  1. Oscillatory motion

  2. One dimenetional motion

  3. Projectile motion

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

Any motion in which the body moves to and fro repeatedly is known as oscillation. A table fan swings with a specific time period and constantly moves to and fro.  Hence it is oscillatory motion

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 is/are not periodic motion?

  1. The motion of the bob of the simple pendulum

  2. Motion of a bouncing ball under the action of gravity and friction

  3. Motion of a planet around the sun

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

A periodic motion is the one which repeats itself at fixed intervals of time.

A bouncing ball doesn't bounce to the same height everytime. Hence we can't say that the motion is repeating.

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

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.