What Are The Examples Of Kinetic Energy?

Kinetic energy is defined as energy that exists in moving bodies. Kinetic energy is generated due to motion. Kinetic energy also has subtypes according to the motion of bodies. Rotational kinetic energy is possessed by a body that rotates on its own axis; a planet’s rotation around the sun comes with rotational kinetic energy. energy of objects due to vibrations called vibrational kinetic energy.

In this tutorial, we will cover details about kinetic energy and learn about practical examples of kinetic energy.

What is kinetic energy?

• Kinetic energy is a basic term used in physics that is used for defining energy transferred to a body when it is in motion.
• For movement of the body, it needed force that causes work. During work done, energy is transferred, which causes the movement of the body with speed.
• energy transferred to an object called kinetic energy, which is measured by the mass and speed of the body
• Kinetic energy is basically the measurement of work done and causes motion.
• Kinetic energy is a scalar quantity that defines magnitude and does not have direction.
• Classical mechanics says that the kinetic energy of a non-rotating body of mass moving with speed v is

Interesting facts about kinetic energy

• when we observe the kinetic energy equation, then we get some details. like kinetic energy has a direct relation with the square of an object’s velocity. Through doubling speed, kinetic energy increases 4 times.
• Let’s suppose we have two cars moving at 30 mph and 60 mph; the high-speed car isn’t more dangerous.
• It has 4 times more kinetic energy, so if any accident occurs, it can cause high damage.
• Another important factor is that kinetic energy is always positive.

Kinetic Energy Formula

KE = 0.5 • m • v²

m is mass of object

v is speed of object

Unit of Kinetic Energy

• kinetic energy measuring units are
• SI Unit:  kinetic energy SI UNIT is Joule (J) or kg.m².s^-2.
• CGS Unit: In CGS system,the kinetic energy is defined in erg.

The dimension equation for kinetic energy is [M¹L²T^-2]

Types Of Kinetic Energy

Translational Kinetic Energy

• Translational energy is defined as energy connected with the movement of the chemical quantity center of mass. When we discuss molecules, atoms, and ions, mass is denoted with m and v is the velocity of the center of mass.

Ek=1/2 mv²

• If substances are liquids and gases, they are highly dynamic. Molecules are zipping around in different directions, so they do not cause single translational energy.
• but complete distribution of translational energy, where each molecule moves at a speed, collides with others, and changes speed when colliding and moving in fluids.

Read also;Difference Between Conduction and Convection

Rotational Kinetic Energy

• Rotational energy is caused by body rotation and is a component of total kinetic energy. Rotational energy is considered over the axis of rotation of the body’s moment of inertia observed.
• rotational energy, also called angular kinetic energy, that is explained as
  • kinetic energy due to body rotation and belongs to total kinetic energy.
• Rotational kinetic energy has a direct relation with rotational inertia and the square of the magnitude of the angular velocity.
• Rolling objects provide translational and rotational kinetic energy.

Rotational Kinetic Energy Dimensional Formula is as

1. Formula for Rotational Kinetic Energy: The formula is KR = ½Iω². 
2. Dimensions of Moment of Inertia (I): The dimensional formula for moment of inertia is [M¹L²] or [M¹L²T⁰]. 
3. Dimensions of Angular Velocity (ω): The dimensional formula for angular velocity is [M⁰L⁰T⁻¹] or simply [T⁻¹]. 
4. Dimensions of ω²: Squaring the dimensions of angular velocity gives [T⁻¹]² = [T⁻²

Vibrational Kinetic Energy

• Vibrational kinetic energy is defined as object energy due to back-and-forth motion, or vibration over a stable position, such as atoms in vibrating solids.
• High-speed object vibrations provide high vibrational kinetic energy.
• This energy produces atoms that vibrate due to attractive and repulsive force applications.It is also produced when atoms move back and forth over a fixed point of equilibrium.
• High temperatures provide high-speed vibrations and more vibrational kinetic energy occurs

Examples of Kinetic Energy

Flying Airplane

• • An airplane during flight also has kinetic energy since it has high mass with very high velocity. in results provide high kinetic energy of the airplane. So high energy helps the plane to fly high.

Walking & Running

• During walking and running we also have kinetic energy. When we run for some distance or walk, we feel warm. Our sweating body is caused by the heat generated in our body during running. During running, chemical energy is converted into kinetic energy.

Cycling

• Bicycling in a state of motion also has kinetic energy. When we start pedaling, we transform body energy into mechanical energy; that potential energy is then transformed into kinetic energy during wheel motions.
• High velocity has high kinetic energy; to stop the cycle, brakes apply, which causes zero energy.

Roller coasters

• A roller coaster also has kinetic energy when the wagon of the roller coaster is at the upper side; it comes with zero kinetic energy since the wagon is in rest conditions.
• during free fall, with increases in speedof wagon also slowly increases kinetic energy
• If the number of people sitting in the wagon increases, mass also increases, and kinetic energy increases, or it has constant speed.

Hydropower Plants

• Hydroplants are used for the generation of power through the use of water. When water flows, it has kinetic energy that collides with a turbine connected to a dam, and the water’s kinetic energy is converted into mechanical energy.
• Due to mechanical energy, turbines move and produce electrical power.

Windmills

• windmills working also kinetic energy example. In a windmill, when air collides with blades, it causes rotation that produces electrical power.
• Air in motion has kinetic energy that rotates blades, and here we can see kinetic energy conversion into mechanical energy.

Moving Car

• A car in a state of motion also has kinetic energy. since it has a certain value of mass and velocity. According to the kinetic energy formula, we can find that the truck and car moving on the road have the same velocity, so the kinetic energy for the truck is larger due to its larger size.
• Kinetic energy has a direct relation with the mass of a body; as a result, a truck has higher kinetic energy compared to a car.

Bullet Releases From a Gun

• When a bullet fired from a gun has kinetic energy, it passes through the body. It occurs due to the high velocity of the bullet that increases kinetic energy.

Cricket Ball

• When the ball in hand of the bowler comes with zero kinetic energy, and when the bowler throws the ball towards the batsman, kinetic energy is produced due to the mass and speed of the ball.
• So the batsman uses gloves for avoiding injury if the ball collides with high kinetic energy.

Skateboarding

• skateboard in rest position: kinetic energy is zero. When a skateboard moves, its kinetic energy increases slowly.
• When skateboard rider weight and the high speed of the board combine, a high amount of kinetic energy is generated.

Dropping a Glass on the Floor

• When glass drops on the floor at the highest points, its energy is potential energy, but when the drop’s speed increases, the mass of the glass and velocity cause an increase in the kinetic energy.
• At the point where the glass is close to striking the ground, kinetic energy is highest and potential energy is zero. When glass strikes the ground, kinetic energy is released.

Bus Moving on the Hill

• A bus at the high point of a hill has high potential energy and zero kinetic energy. When the bus moves downward with some velocity, the potential energy due to height reduces and the kinetic energy increases.

Kinetic Energy Conversion

Kinetic energy is transferred between bodies and converted into different types of energy.

Car Brake

• When we apply car brakes, the kinetic energy of the car is converted into other energy, like heat energy. Friction occurs between brake pads and tires, reducing car speed through the transformation of kinetic energy into thermal energy.

Wind Turbine

• Kinetic energy of moving air in wind turbine converted into electrical energy. When wind blows, it rotates turbine blades. Kinetic energy of wind is transformed into mechanical energy that produces electrical power.

Waterfall

• When water falls through high elevation on a waterfall, potential energy is converted into kinetic energy. Moving water has high speed and kinetic energy that produces hydroelectric power.

Elastic Collision

• When two bodies collide, kinetic energy is converted between them, like the collision of billiard balls. when balls collide, and rebound kinetic energy is converted into heat and sound energy

Pendulum Swing

• When the pendulum moves back and forth, potential and kinetic energy transformation occurs. For a high point swing, there is potential energy that exists, and when it descends, potential energy is transformed into kinetic energy.

Is Kinetic Energy a Scalar Quantity?

• Kinetic energy is a scalar quantity since it does not have direction. It denotes the magnitude of energy of the body. Velocity is a vector quantity that has direction and magnitude, and for measuring kinetic energy magnitude, velocity follows.
• kinetic energy based on mass and the square of velocity magnitude.
• Velocity square makes kinetic energy positive irrespective of motion direction.
• Either velocity is a vector quantity, and the calculation of K.E. provides magnitude and makes it a scalar quantity.