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 lever common machines terms related to machines introduction to simple machines

Which of the following statements in NOT correct?

  1. In a first order lever, the fulcrum is placed between the effort and the load.

  2. The mechanical advantage of a second class levers is greater than 1 as load is situated in between to effort and fulcrum.

  3. An inclined plane in a hospital, helps in pushing a wheel chair easily.

  4. A crow bar is an example of second class level.
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Multiple choice physics lever common machines terms related to machines introduction to simple machines

Mechanical advantage of a second order lever is :

  1. always less than one

  2. less than or equal to one

  3. always greater than one

  4. greater than or equal to one
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In a second-class lever, the load is between the fulcrum and the effort. This means the effort arm is always longer than the load arm, resulting in a mechanical advantage always greater than 1.

Multiple choice physics lever common machines terms related to machines introduction to simple machines

When the same amount of force is applied :

  1. A nail travels more distance than a screw into the wood board

  2. Screw travels more distance than the nail

  3. Both pierce the wood board to equal distance

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

A screw is an inclined plane wrapped around a cylinder. When force is applied, the screw must rotate multiple times to penetrate the wood, resulting in a longer travel distance compared to a nail, which is driven straight in.

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 coulomb's law field strength and potential gradient electric field as gradient of potential relation between electric field and electric potential

Variation in potential is maximum if one goes :

  1. along the line of force

  2. perpendicular to the line of force

  3. in any direction

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

$dV=-\vec{E}.d\vec{r}=-Edr cos\theta$


Hence, variation will be maximimum for $\theta=0^{o}$ or $180^{o}$, that is variation $dV$ is maximum along line of field or say line of force.

Answer-(A)

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.