Gravitation Of Force

PROJECT ON FORCE

GOVT. SEC. SCHOOL, NABHA (BOYS)

COMPUTER LAB

INDEX • • • • • • • •

INTRODUCTION DEFINITION OF FORCE TYPES OF FORCES TYPES OF FRICTION LAWS OF MOTION CONCLUSION ACKNOWLEDGMENT REFERENCES

INTRODUCTION Force Types of Force: Force of Friction, Force of Gravity, Gravitational Force Newton’s law’s of Force Newton’s First law of Force Newton’s Second law of Force Newton’s Third law of Force

DEFINITION OF FORCE Any action or influence that accelerates an object. Force is a vector, which means that it has both direction and magnitude. When several forces act on an object, the forces can be combined to give a net force.It is measured in Newton's

FORCE’S ACTING ON A BODY • There are two forces acting upon the person. The force of gravity exerts a downward force. The floor of the floor exerts an upward force.

A FEW TYPES OF FORCES Force’s of friction Force of Gravity Gravitational Forces

FORCE’S OF FRICTION Air Friction

Sliding Friction

The shape of the object is given such that to minimize friction

FORCE OF GRAVITY , a baseball

• Consider thrown upward from Earth's surface the downward force of Earth's gravity continuously modifies the baseball's velocity, slowing the initial upward motion and eventually causing the ball to fall back to the ground.

GRAVITATIONAL FORCES • Every body Attracts another body. • This is the reason that the planet’s go on revolving around the sun

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Planets keep on revolving round the sun due to their gravitational force.

STATIC FRICTION • Friction makes this lorry difficult to move, but it does help by giving the man a good grip on the road.

AIR FRICTION • Aircraft and car designers want to reduce drag, so that the vehicle can go fast without having to waste too much fuel.

SLIDING FRICTION • Ice skaters actually move on a layer of water, and don't skate on ice at all. When ice is subjected to high pressure it melts. The narrow blades of the skates create a very high pressure and thus the skaters glide along on a layer of water they've just melted. The water refreezes as soon as they've moved on.

Sir Isaac Newton Law’s of motion were given by Newton

FIRST LAW OF MOTION • According to Newton's first law, an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. It is the natural tendency of objects to keep on doing what they're doing. All objects resist changes in their state of motion. In the absence of an unbalanced force, an object in motion will maintain this state of motion. This is often called the law of inertia.

When the running truck collides with the car the ladder on the truck falls down this is so because the ladder was also in motion along with the truck. The truck suddenly comes to rest but the ladder is in motion there for it falls down

NEWTON'S SECOND LAW Second Law is more abstract than the first. The Second Law governs all acceleration and is really very simple -- Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). Everyone unconsciously knows the Second Law. Everyone knows that heavier objects require more force to move the same distance as lighter objects. However the Second Law gives us an exact relationship between force, mass, and acceleration

BOOKS IN THE LAP OF A CHILD • The mass of the books is more,hence she is experienceing more force

PROPELLING OF A ROCKET • The rate of change of momentum is directly proportional to the impressed force.

When somebody blows on the ear of a person the jaw is automatically opened

FIRING A GUN • When a gun is fired, the bullet goes forward and it pushes the shoulder backward

ACTION AND REACTION • A sparrow pushes the place where it is sitting while it moves from one place to another and its reaction is it leaves that place.

Action and reaction goes side by side

CONCLUSION • With the help of this project the students can easily understand the meaning of force. They can also easily understand the NEWTONS LAWS OF FORCE as suitable examples have been given along with the diagrams.

REFERENCES • •

INTERNET: WWW.FORCE.COM

2.TEXT BOOK OF 9TH CLASS 3.MICROSOFT ENCARTA ENCYCLOPEDIA

PREPARED BY:

•SH. DEVINDER KUMAR SHAHI SCIENCE MASTER

(M.Sc. , B.Ed.) SH. TARSEM LAL SCIENCE MASTER

(M.A. , B.Ed.)

HELPED BY: • GURWINDER SINGH • GURDEEP SINGH

I

GUIDED BY

• PARMINDER SINGH [M.Sc. (IT) ] (COMPUTER FACULTY)