Physics 10

ചലന നിയമങ്ങൾ, ബലം എന്നിവയുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ

• Theory of relativity was introduced by

                  Albert Einstein (1905)

• Which law states that every body continues to be in its state of rest or uniform motion in a straight line unless an external force acts up on

                  Newton's first law of motion

• As per Newton's second law of motion the rate of change of momentum of a body is directly proportional to

                  Applied force

• Which law states that for every action there is an equal and opposite reaction

                  Newton's first law of motion

• Inertia can be explained with

                  Newton's first law of motion

• Which law of motion defining the force

                  Newton's first law of motion

• Which law of motion is known as the measure of force

                  Newton's second law of motion (F=(mv)/t) or F=ma)

• Which law proves that different masses accelerate to the earth at the same rate but with different forces

                  Newton's second law of motion

• The propulsion of rockets and the working of jet engine etc are explained with the help of

                  Newton's third law of motion

• The flying of a bird is consequence of

                  Newton's third law of motion

• CGS unit of force

                  Dyne (1 Newton = 10⁵ Dynes)

• The internal force per unit of cross section of a strained body is called

                  Stress (Force/Area)

• Unit of stress is

                  Pascal or N/m²

• The ratio of change in dimention to the original dimention is called

                  Strain

• Unit of strain is

                  No unit

• Weakest force in nature

                  Gravitational force

• Strongest force in nature

                  Nuclear force

• The upward force exerted by a fluid on a body placed in a fluid is called

                  Buoyant force (Buoyancy)

• The principle of buoyancy was discovered by

                  Archimedes

• When a body inserted into water the feet of weightlessness is because of 

                  Buoyant force

• Weight of the body inserted in water is equal to the weight of liquid displaced by the body. Which law states that

                  Law of Floataton

• The force which enable an object to move along a circular path is

                  Centripetal force

• Centripetal force is always directed towards 

                  Centre of the circle

• Centripetal force required to keep moon in its orbit is given by

                  Gravitational force of Earth

• Raising outer edge of curved road to provide necessary centripetal force is called

                  Banking of the roads

• Tendency of an object following a curved path to fly away from the centre of curvature 

                  Centrifugal force

• Force that acts outwards of a body revolving in a circle

                  Centrifugal force

• Force which helps to seperate the cream from milk is 

                  Centrifugal force

• The capability of rotating object around a fixed axis is called

                  Torque

• The very large force acting for a very short interval of time on a body is called 

                  Impulsive force

• Kicking of a ball, striking a nail with hammer etc are examples of

                  Impulsive force (Impulse=Force x Time)

• Force which opposes the relative motion of two surfaces in contact is called 

                  Frictional force

• Slow landing of parachute is possible because of

                  Frictional force of air

• Ball bearings work on the principle of

                  Rolling friction

• Substances which reduces the friction between moving surfaces is called 

                  Lubricants

• Example of a lubricant which used in heavy machines

                  Graphite

• Force which pulls a body towards earth is called

                  Gravitational force

• Gravitational force is discovered by

                  Sir Issac Newton

• Gravitational force between two bodies is always

                  Attractive

• Force of attraction between earth and any other particle in universe is called

                  Gravity (Force of gravity)

• Gravitational force is maximum in 

                  Jupiter

• Gravitational force is minimum in 

                  Mercury

• Gravitational intensity inside an object is

                  Zero

• If the distance between two objects is doubled, the gravitational force of attraction between them

                  Reduced to quarter (F=GMm/r²) M : mass

• Force of attraction between unlike objects is called 

                  Adhesion

• Force of attraction between like objects is called 

                  Cohesion

• The force exerted by a liquid surface to decrease its surface area to minimum is called 

                  Surface Tension

• Surface tension occurs due to 

                  Cohesion

• Force which helps insects to walk on the surface of water is due to

                  Surface tension

• Detergents are added to water to

                  Reduce surface tension

• Spherical shape of water drop is due to

                  Surface tension

• Surface tension of water is inversily proposal to

                  Temperature and Pressure
                                                                          (To be Continued...)