Kinetic energy have the right to never be negative. That is constantly greater than or equal to zero.The K.E the a moving object equals one-half the product of its mass, and the square that itsvelocity.Since the mass of things can never ever be zero and also the square of velocity provides the prize positive.Therefore, Kinetic power can never ever be negative.

You are watching: Can the kinetic energy of an object be negative   Units of Kinetic Energy

Joules (MKS system).Erg (CGS system, 1 erg = 10-7Joules).Electron volt (atomic/subatomic scale).

## Kinetic power (Key Points)

The power possessed by the body due to its motion.Unit is Joul (kg.m2/sec2).Kinetic power can never ever be negative.Directly proportional come the velocity the the thing squared. This means that as soon as the velocity of an object doubles, it’s K.E quadruples.Directly proportional come the massive of relocating object, as soon as the mass of object doubles, K.E also gets double.Scalar quantity. Totally described by magnitude alone.Can kinetic power be negative? No

## Kinetic power Formulas

### Translation K.E

Translational K.E= (1/2)(mass)(velocity)2.Massis the quantity of matter had within things and velocityis the rate of a moving object in a particular direction.

### Rotational K.E

Rotational K.E = (1/2)(Moment the Inertia)(angular velocity)2.Moment the inertia is the angular mass or rotational inertia of a strictly body and also angular velocity is a vector measure up of rotation rate.

Types that Kinetic Energy

There are 5 main varieties of K.E:

Radiant energy (refers come the energy that travels by waves or particles)Thermal energy (refers come the energy among the atoms and also molecules in an object.)Sound energy (deals v the energy caused by vibrations.)Mechanical energy (refers to the energy associated with the mechanical activity of an object.)

## Kinetic Energy interpretations in basic Words

Kinetic energy is characterized as the power possessed by a body by virtue of its motion.The translational K.E of a human body is equal to one-half the product of its mass,m, and the square the itsvelocity,v, or(1/2)mv2.The rotational K.E of a body is equal to one-half the product the its minute of Inertia, I, and also the square of itsangular velocity,ω, or(1/2)2.

## What is Work?

Workis a force acting on an object in the direction that motion. The is the product of pressure (F) and displacement (S) in the direction the the force. The is a scalar quantity and its unit is Joule.Work excellent = pressure x displacement.

### What is 1 Joule?

1 Joule is the quantity of job-related done as soon as a pressure of 1 Newton is applied over 1 meter the distance.Joule = N.mJoule= kg*m2/sec2

## Derivation that Equation that Kinetic Energy

Consider a human body of mass “m” relocating with velocity “v” ~ above a rough surface.The human body stops after relocating through a distance “S” as result of frictional force on it.As human body possesses K.E and is qualified to execute work versus opposing force F till it stops and also loses every one of its K.E. In this case, Kinetic energy equals the job-related done by the body. The early stage velocity (vi) of the human body is v and the final velocity (vf) is zero.

K.E=Work = FSF=ma and also a= -F/m (acceleration is an unfavorable as movement is opposed)2aS =vf2-vi2 (Newton legislation of motion)2(-F/m)S= (0)2-(v)2-2FS/m=-v2FS =(1/2)(m)v2 = K.E

## Can Velocity be Negative?

Since velocity is a vector quantity, it can be negative. A hopeful velocity denotes that the thing is traveling in the hopeful direction as defined by the coordinate system, whereas a negative velocity denotes the the object is relocating in opposing direction. Simply said, when velocity turns negative, it is the rate in opposing direction. Come get more insight into the topic, please describe the article “can velocity it is in negative?“

## Example difficulties Kinetic energy

Example 1: discover the Kinetic energy of a plane with a massive of 20 Tonnes, relocating with a velocity of 500 m/sec.

Mass of aircraft = 20 Tonnes =20000 kg.Velocity = 500 m/sec.K.E = (1/2)(mass)(velocity)2
K.E = (0.5)(20000 kg)(500 m/sec)2 =2500 MJ

Example 2: discover the Kinetic power of an object of fixed two-kilogram relocating at a rate of one meter per second.

Mass=2kg; velocity = 1m/sec.K.E = (0.5)(2 kg)(1 m/sec)2.K.E = 1 Joule

Example 3: an item of massive 500g strikes the ground with a velocity the -20 m/sec. How much is the K.E that the thing at the time it strikes the ground? have the right to kinetic energy be an unfavorable in this case?

Mass = 500 g = 0.5 kg.Velocity = -20 m/sec.K.E = (1/2)(0.5 kg)(-20 m/sec)2K.E=100 kg m2/sec2 = 100 J (K.E is positive).

Example 4: A car weighing 10 kN has speed of100 km/sec. Find its K.E.

Weight of treatment = 10 kN = 10000N.Weight = (mass)(gravity)10000N= (mass)(9.8 m/sec2)mass=(10000N)/(9.8 m/sec2)mass of vehicle in kg = 1020.40 kg.Speed of automobile = 100 km/sec = 100000 m/secK.E =(1/2)(mass that car)(speed that car)K.E=(1/2)(1020.40 kg)(100000 m/sec)2K.E = 51.02 MJ

## Related Topics

 Centripetal Acceleration| 9 straightforward Examples Can work Be Negative?| simple Explanation Mass vs Weight| simple Explanation Can pressure be Negative?| simple Explanation

## Summary

The answer come the inquiry ” can Kinetic power be negative” is simply No. K.E is a fifty percent product the mass and also square the velocity.Mass of an item is always positive and the square that velocity makes complete K.E a optimistic value. The full K.E the a human body is the amount of the kinetic energies resulting from each type of motion. The faster the motion, the more K.E the object has. The kinetic power of a moving object is constantly positive.