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# motions & laws force ,friction etc

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### motions & laws force ,friction etc

1. 1. FORCE •Force is the pull of gravity exerted on an object or an object’s thrust of energy against friction. •You apply a force on a machine; the machine, in turn, transmits a force to the load.
2. 2. A tension force is a pulling force exerted by an object when it is stretched, such as a rubber band.
3. 3. •A compression force is a pushing force exerted by a material when it is squeezed or compressed. • The size of the compression force exerted by a material is equal to the size of the force that compresses the material.
4. 4. Newton
5. 5. Sir Isaac Newton is regarded to be one of the most influential scientists of all time. He studied physics and created the three laws of motion. This PowerPoint will tell you more about Sir Isaac Newton: He was……… Born: December 25, 1642, Woolsthorpe, United Kingdom Died: March 20, 1727, Kensington, United Kingdom Full name: Sir Isaac Newton Education: Trinity College, Cambridge (1667–1668). Parents: Isaac Newton Sr., Hannah Ayscough
6. 6. Isaac Newton studied in Cambridge and he was a professor there from 1669 to 1701. His most important discoveries were made during 1664 to 1666 when the university closed and he retired from his job and returned to his hometown. From there he discovered the law of gravity from the apple story. He also discovered that white light is made of all the colours of the rainbow. These things have made him able to make contributions to mathematics, astronomy and physics.
7. 7. • Isaac was born in England, and was a physicist, astronomer, mathematician, philosopher, alchemist and theologian. • In 1687, Newton published Philosophae Naturalis Principia Mathematica, which is one of the most important books in the history of science. In it Newton describes gravitation and the three laws of motion. • Newton’s law of gravitation describes the gravitational attraction with bodies with mass.. • Newton moved to London in 1696 and took up a job as the Warden of the Royal Mint. • Newton is known to have said that his work on the theory of gravitation was made by watching an apple fall from a tree. This story is still popular today.
8. 8. • The ball does not travel in a straight line because of the unbalanced force of gravity acting on it.
9. 9. Friction Friction is a force that opposes the movement between two surfaces in contact. • A book pushed across a table slows down because of friction. • Friction is an unbalanced force acting on the book to slow it down.