Skip to main content

Kinetic energy

Image
By

Describe kinetic Energy?

Kinetic energy - 1. The energy possessed by a body virtue of its motion is called kinetic energy.
2. Some examples of kinetic energy from our day to day life are:
a) K.E of running water is used to run the water mills.
b) The kinetic energy of the hummer is used to drive a nail in wood.
c) A bullet fired from a rifle can penetrate into a target because of its kinetic energy.
Kinetic energy
Kinetic energy

3. Calculation of kinetic energy: 

The kinetic energy of a body of mass m moving with velocity v can be calculated by any of the following two ways:
a) Either by calculating the amount of done by the moving body against the external force, before it comes to rest.
b) Or by calculating the amount of work required to set the body into motion with the velocity v from its state of rest.
We shall calculate here kinetic energy of a body by the second method. Suppose a constant force F is applied on the body at rest till it starts moving with velocity v along the direction of force.
Calculation of kinetic energy
Calculation of kinetic energy

Suppose s be the displacement of body during this time. Then work done by the force
W = Fs (as θ =0°) ...........(1)
If a is the acceleration/ produced in the motion of body, then according to Newton’s second law of motion, F= ma
Because all the vector s, v and a are along the direction of F, the arrow heads may be dropped and we use simply their magnitude.

Therefore, eq. (1) takes the form
W = m as .........(2)
Using the relation v2-u2 = 2as, we get
v2=2as or a = v2/2s...........(3)
From the eq.(1) and (3), we get
W = m.(v2/2s)s=1/2mv2
Because this work done on the body of mass m will set the body moving with velocity v from its state of rest, it is equal to kinetic energy of the body.
Thus, Kinetic Energy =1/2 mv2 ...........(4)


Labels:

Comments

  1. Babita MauryaMarch 8, 2019 at 3:03 PM

    I describe kinetic Energy in this blog post.Friends comment here.

    ReplyDelete

Post a Comment

Popular posts from this blog

Biography of Manohar Joshi

By
Biography of Manohar Joshi: Manohar Gajanan Joshi is an Indian politician who has played a significant role in Maharashtra state politics. Born on December 2, 1937, in a middle-class family in a village called Ganeshpeth in Ratnagiri district, Maharashtra, Joshi's journey into politics was marked by his association with the Shiv Sena, a right-wing regional political party in India. Joshi's political career began in the late 1960s when he joined the Shiv Sena, which was then led by its founder, Bal Thackeray. He quickly rose through the ranks of the party due to his organizational skills, dedication, and ideological alignment with the party's principles, which advocated for the interests of the Marathi-speaking population of Maharashtra. In 1972, Manohar Joshi won his first election to the Brihanmumbai Municipal Corporation (BMC), marking the beginning of his electoral career. He served as a corporator in the BMC and later became the Mayor of Mumbai in 1976. Joshi's tenu...
Post a Comment
Read more

Professor Cheiro Prophecies about India | 5 predictions Professor Kiro - Kiro made these amazing predictions for India

By
Professor Cheiro Prophecies:  Here is Kiro made these amazing predictions for India: Professor Kiro was born in November 1866 in England. At the age of 17, Kiro came to Mumbai and met astrologer Vednarayan Joshi. With his advice, he will reach the Himalayas, Kashmir, Ladakh and Varanasi. From here, he studied astrology extensively. Kiro made many predictions in his life, which we are giving you here. Cheiro, whose real name was William John Warner, was a prominent Irish astrologer and palmist who gained fame in the late 19th and early 20th centuries. He was known for his accurate predictions and was consulted by various prominent figures of his time, including Mark Twain, Oscar Wilde, and Thomas Edison. Cheiro also made some predictions related to India. Parada Kahanee One of his notable predictions about India was made in his book "Cheiro's World Predictions," published in 1926. In this book, he wrote about the possibility of India gaining independence from British...
Post a Comment
Read more

Biography of Abbie Hoffman | Early Life and Political Activism - Later Years and Personal Life - Legacy of Abbie Hoffman

By
Biography of Abbie Hoffman: Abbie Hoffman (November 30, 1936 – April 12, 1989) was an American political and social activist known for his involvement in the counterculture and anti-war movements of the 1960s and 1970s. He was a key figure in the Youth International Party (Yippies) and was known for his theatrical and often humorous protests.  Here is a brief biography of Abbie Hoffman: Early Life of Abbie Hoffman: 1. Birth: Abbie Hoffman was born on November 30, 1936, in Worcester, Massachusetts, USA. 2. Education: He attended Brandeis University, where he earned a degree in psychology in 1959. Parada Kahanee Political Activism: 1. Civil Rights Movement: Hoffman began his activism by participating in the civil rights movement during the early 1960s. 2. Youth International Party (Yippies): In 1967, Hoffman, along with Jerry Rubin and others, co-founded the Yippies, a countercultural and anti-authoritarian political party known for its unconventional and theatrical protes...
Post a Comment
Read more