Difference Between Kinetics and Kinematics

Exams Prep Master

Kinetics, as well as kinematics, are considered as a part of classical mechanics which are associated with the motion of objects in different spaces. Kinetics implies the study of forces that cause motion, whereas kinematics refers to the mathematical description of motion without the consideration of the force that causes the motion.

Table of Content

1.What is kinetics?

2.What is kinematics?

3.Difference between kinetics and kinematics

4.Difference between kinetics and kinematics with example

5.Things to remember

6.Sample Questions

In our regular life, we perceive various activities around us. For example, a cricket ball going down a slope, a car running down the street, moving animals, flowing rivers, people walking, etc. Such movements and the study of movements of these objects in simple terms is termed, Mechanics. Students tend to confuse these two terms (kinetics and kinematics) considering them as synonyms of each other. Thus, it is important for them to find the difference between kinetics and kinematics.

What is Kinetics?

Kinetics is also referred to as “dynamics”. It is termed as an arm of science that deals with WHY’S physics. It’s a branch of physics, which deals mainly with inspecting the power and forces on an object. For example, when it comes to a spinning motion, we usually do compute TORQUE. This Kinetics Newton’s Law of Motion is functional to study an object’s motion. While learning this topic, students are asked to draw the force illustrations/ diagrams using vector math to determine values like the direction of acceleration, net force, etc. It can be termed as the sub-category of classical mechanics known as forces.

What is Kinematics?

Kinematics is connected to the motion of any object that exists in the world. The word “Kinema” means motion. It refers to the study of how motion, moving, and passing works. It describes and briefly explains the motion of an object. Its definitions will explain the real-world objects and their motion. Some crucial factors and parameters in kinematics are velocities, time, displacement. Some famous and popular examples of motion are horizontal motion, vertical motion, projectile motion.

Both Kinetics and Kinematics are important branches of Mechanics. They do assist the physicists to recognize and understand the motion’s nature in different ways and consequently to determine values depending on what we are studying. These two branches are complementary to each other.

It is the fact that, without the branch of Kinetics, Physicists wouldn’t be able to answer any questions that are related to motion. For example, A physicist will require equations with a strong and accurate understanding of forces to find the origin of the acceleration pulling a ball thrown back to the ground.

Difference between Kinetics and Kinematics

Basis/ Attributes/ Specifications	Kinetics	Kinematics
Definition	It is the study of motion with the external forces, along with mass as well.	It is not dependent on the object’s mass.
Nature of motion	It inspects causes of motion.	Its center of attention is the acceleration, position, and speed of an object.
Mass consideration	Involves.	Does not involve.
Relation	It strives to figure out the relationship between the mass of a body and the motion of bodies give rise to by inertial force.	It is just about describing the motion. For example, time, acceleration, displacement, and velocity.
Nomenclature	It is also called Dynamics.	It is known as Kinematics only.
Study	Study of motion generated by gravity, torque, forces, and friction.	It is to determine the ‘HOW’ of the motion.
Force	Considers major force.	Do not consider major force.
Nature	Strives to get at the cause.	It is based on observation and it’s descriptive.
Treated	In terms of energy alteration.	Geometrically.
Mathematical expression	It does not have any complicated expression.	It has numerous expressions.
Uses	Concepts of fluid dynamics, physical chemistry, gas laws.	In terms of engineering, it is classical mechanics.
Application areas	Automobile designing.	Majorly studies the motion of objects.
Other areas	Several streams of science also include biology and chemistry.	It is limited to just physics.
Examples	A toddler running around the house, A person sitting in a moving bus, etc.	A ball hitting the ground, A moving bus, etc.

Difference between Kinetics and Kinematics with Examples

Basis/ Attributes/ Specifications	Kinetics	Kinematics
Causes of Motion	Explains concepts like torques, different forces, etc.	Explains concepts like, acceleration, the final position of an object which is in motion, speed, etc.
Particle mass inclusion	Consists of masses of specifications while explaining a phenomenon.	Incorporate the effect of various forces that work between two systems.
Mathematics or physics	Has reached over other science streams.	Limited to physics, it is also termed as ‘Geometry of Motion’ as it also connects to mathematics as it also deals with physics, which is not applicable for Kinetics.

Things to Remember

Both the topics are crucial branches of classical mechanics.
It allows physicists to know the nature of motion and movement in numerous ways and to determine numerous values hanging upon what they are studying.
It is added in the syllabus to understand that Kinematics helps to get answers more of ‘WHAT’ questions that particularly mention the movement of an object, it helps to describe the acceleration, time, velocity, and few things like these of an object.
Without Kinetics, physicists would not be able to answer the questions related to ‘WHY’, To answer such types of questions he/she needs to study the equations and need to have a solid knowledge of forces.

Sample Questions

Ques: What is meant by kinematics? (2 marks)

Ans: Kinematics is connected to the motion of any object that exists in the world. The word “Kinema” means motion. It refers to the study of how motion, moving, and passing works. It describes and briefly explains the motion of an object. Its definitions will explain the real-world objects and their motion. Some crucial factors and parameters in kinematics are velocities, time, displacement. Some famous and popular examples of motion are horizontal motion, vertical motion, projectile motion.

Ques: What are the Different Types of Kinetics? (1 mark)

Ans: Kinetics is related to motion. It is classified into 5 types Mechanical, Electrical, Thermal, Radiant, and Sound.

Ques: How Kinematics and Kinetics are Relevant in Mechanics? (2 marks)

Ans. These two concepts deal with the movement of the celestial body but numerously. For instance, when we elaborate on the movement of a cork in the air, we can exhibit it through the preservation of energy. We can even present it in a form of energy in general.

Both the topics clarify both force and motion, which are related to one another.

Ques: Three vessels of equal capacity have gases at the same temperature and pressure. The first vessel contains neon (monoatomic), the second contains chlorine (diatomic), and the third contains uranium hexafluoride (polyatomic). Do the vessels contain an equal number of respective molecules? Is the root mean square speed of molecules the same in the three cases? If not, in which case is vrms the largest? (2 marks)

Ans. Same volumes of all the gases under the same state of pressure and temperature contain an equal number of molecules (according to Avogadro’s hypothesis). Consequently, the amount of molecules in each case is the same.

Ques: Explain why vehicles like scooters, trains, trucks are provided with shockers? (3 marks)

Ans. When these vehicles run on the surface of the road, the road creates some impetuous, impervious forces in the form of tug, to allow smooth motion of such vehicles, a shocker is already made in the system which soaks up all the shocks or the impervious forced caused by the indifferent roads to make them smooth and steady motion, as these shockers enlarge the duration of the impulse.

Ques: Explain the reason why it is more difficult to catch a cricket ball than a tennis ball. (2 marks)

Ans: This type of ball has a large boost and consequently acceleration hence high speed. So, the cricket ball will apply a huge force on the hand during the catch. So that’s the reason why cricket ball is difficult to catch.

Ques: What do you mean by human kinetics? (2 marks)

Ans: Human kinetics deals with human movement as well as physical exercises which has a great impact on physical performance and health. This subject is also known as biomechanics that includes skeleton, muscles, and influence of gravity.

Ques: What is kinetics? (3 marks)

Ans: Kinetics is also referred to as “dynamics”. It is termed as an arm of science that deals with WHY’S physics. It’s a branch of physics, which deals mainly with inspecting the power and forces on an object. For example, when it comes to a spinning motion, we usually do compute TORQUE. This Kinetics Newton’s Law of Motion is functional to study an object’s motion. While learning this topic, students are asked to draw the force illustrations/ diagrams using vector math to determine values like the direction of acceleration, net force, etc. It can be termed as the sub-category of classical mechanics known as forces.

Ques: Differentiate kinetics and kinematics in terms of definition, nature of motion, mass consideration, relation, and nomenclature. (5 marks)

Ans:

Attributes	Kinetics	Kinematics
Definition	It is the study of motion with the external forces, along with mass as well.	It is not dependent on the object’s mass.
Nature of motion	It inspects causes of motion.	Its center of attention is the acceleration, position, and speed of an object.
Mass consideration	Involves.	Does not involve.
Relation	It strives to figure out the relationship between the mass of a body and the motion of bodies give rise to by inertial force.	It is just about describing the motion. For example, time, acceleration, displacement, and velocity.
Nomenclature	It is also called Dynamics.	It is known as Kinematics only.

Ques: Differentiate between kinetics and kinematics in terms of: (4 marks)

Causes of motion

Particle mass inclusion

Mathematics or physics

Ans:

Basis/ Attributes/ Specifications	Kinetics	Kinematics
Causes of Motion	Explains concepts like torques, different forces, etc.	Explains concepts like, acceleration, the final position of an object which is in motion, speed, etc.
Particle mass inclusion	Consists of masses of specifications while explaining a phenomenon.	Incorporate the effect of various forces that work between two systems.
Mathematics or physics	Has reached over other science streams.	Limited to physics, it is also termed as ‘Geometry of Motion’ as it also connects to mathematics as it also deals with physics, which is not applicable for Kinetics.

Difference Between Kinetics and Kinematics

What is Kinetics?

What is Kinematics?

Difference between Kinetics and Kinematics

Difference between Kinetics and Kinematics with Examples

Things to Remember

Sample Questions

CBSE CLASS XII Related Questions

1.
Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.

2.
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

3.
Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).

4.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

5.
Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]

6.
What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?

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Difference Between Kinetics and Kinematics

What is Kinetics?

What is Kinematics?

Difference between Kinetics and Kinematics

Difference between Kinetics and Kinematics with Examples

Things to Remember

Sample Questions

CBSE CLASS XII Related Questions

1. Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.

2.Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

3.Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).

4. If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

5.Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]

6.What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?

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SUBSCRIBE TO OUR NEWS LETTER

1.
Draw the number of scattered particles versus the scattering angle graph for scattering of alpha particles by a thin foil. Write two important conclusions that can be drawn from this plot.

2.
Suppose a pure Si crystal has \( 5 \times 10^{28} \) atoms per \( \text{m}^3 \). It is doped with \( 5 \times 10^{22} \) atoms per \( \text{m}^3 \) of Arsenic. Calculate majority and minority carrier concentration in the doped silicon. (Given: \( n_i = 1.5 \times 10^{16} \, \text{m}^{-3} \))

3.
Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).

4.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

5.
Two thin lenses of focal length \( f_1 \) and \( f_2 \) are placed in contact with each other coaxially. Prove that the focal length \( f \) of the combination is given by \[ f = \frac{f_1 f_2}{f_1 + f_2}. \]

6.
What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?