FORCE & PRESSURE PART 3

žThe force that pulls all objects towards the centre of the EARTH is called the GRAVITATIONAL FORCE.
žIt is the attraction between an object and the earth .
žThis force is always attractive
žGravity is responsible for keeping all the planets in their respective orbits
žThe measure with which Earth pulls an object towards itself is measured in terms of quantity called WEIGHT.
žThe scale of  a spring balance uses this fact to measure the weight of different objects.
žWhen an object is hung on a spring balance, the gravity of the earth pulls the object down.
žDue to this the pointer attached with the spring balance indicates the weight of the object.
ž
žA force has both MAGNITUDE & DIRECTION, which makes it a vector quantity.
žThe magnitude of force is strength of that force which can be calculated in numbers.
žDirection of the force is the direction of PUSH & PULL due to force.
žThe SI unit of force is NEWTON (N), which is named after famous scientist SIR ISSAC NEWTON.
žIn the real world, an object is always acted upon by more than one force at a time.
žTherefore, while dealing with forces the concept of equilibrium or balance becomes essential.
žA single resultant force which is the sum or combination of all forces acting on an object is called NET FORCE.
žWhen the net force is zero(0) the object is said equilibrium
1.FORCE CAN MAKE STATIONARY OBJECTS MOVE WHEN A  FORCE IS APPLIED ON  IT.
2.FORCE CAN STOP MOVING OBJECTS OR SLOW THEM DOWN
3.FORCE CHANGES THE DIRCTION OF MOTION
4.FORCE CHANGES SHAPES & SIZES
žA stationary object can be set into motion when a force is applied on it.
žExample; a stationary football can be made to move by kicking it.
žWhen, a object is already in motion, a force can make it move faster by pushing it.
žIt is not necessary that a force always makes a stationary object move
žExample; if an average human tries to push a truck it will not move.
ØA moving object can be stopped by applying stop in the opposite direction to the motion of the moving object.
ØExample; the goalkeeper stops the football from reaching the goalpost by applying pressure in opposite direction
ØWhen, applied force is not sufficient, the applied force slows down the object.
ØExample; a bicycle can be stopped or slowed down by applying breaks.

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