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Statement 1: If is easter to pull a heav...

Statement 1: If is easter to pull a heavy object than to push it on a level ground
Statement ii: The magnitude of frictional force depends on the nature of the two surfaces its contact

A

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.

B

If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.

C

If Assertion is True but the Reason is False.

D

If both Assertion & Reason are False

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The correct Answer is:
B
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STATEMENT-1: It is easier to pull a heavy object than to push it on a level ground and STATEMENT-2: The magnitude of frictional force depends on the nature of the two surfaces in contact.

STATEMENT-1: It is easier to pull a heavy object than to push it on a level ground and STATEMENT-2: The magnitude fo frictional force depends on the nature of the two surfaces in contact.

Choose the correct statement(s) about the frictional force between two solid surfaces in contact

Statement I: The coefficient of friction can be greater than unity. Statement II: The force of friction is dependent on normal reaction and the ration of force of friction and normal reaction cannot exceed unity.

Statement I: An object from a greater height reaches a steady terminal velocity. Statement II: The viscous forces on a body depends upon its velocity. The greater the velocity the greater is the viscous force.

Statement I: Pulling is easier than pushing on a rough surface. Statement II: Normal reaction is less in pulling than in pushing.

Statement I: A needle placed carefully on the surface of water may float, whereas the ball of the same material will always sink. Statement II: The buoyancy of an object depends both on the material and shape of the object.

Now when the surface is smooth , the toy car travels larger distance. It is found that friction is caused by interlocking of irregularities on the two surfaces in contact . Irregularities between two surfaces in contact. The above figure shows minute irregularities on two surfaces which are locked into one another . If we want to move any surface , some part of the external force applied is used to overcome this interlocking want to maove any surface , some part of the external force applied is used to overcome this interlocking . A rough surface has a large number of irregularities , so the force of friction is greater . A smooth surface has small number of irregularities , so the force of friction is less. 2. Normal reaction : The force of friction depends on the normal reaction also. As the normal reaction increases , the interlocking between two surfaces in contact increases as they press harder against each other and hence friction increases .

Statement I: Imagine holding two identical bricks under water. Brick A is completely submerged just below the surface of water, while brick B is at a greater depth. The magnitude of force exerted by the person (on the brick) to hold brick B in place is the same as magnitude of force. exerted by the person (on the brick) to hold brick A in place. Statement II: The magnitude of buoyant force on a brick completely submerged in water is equal to the magnitude of weight of water it displaced and does not depend on the depth of the brick in water.

Statement I: Droplets of liquid are usually more spherical in shape than large drops of the same liquid. Statement II: Force of surface tension predominates force of gravity in case of small drops.

ALLEN-TEST PAPER-Exercise (Physics)
  1. Assertion :- Work done by frictional force may be sometimes path indep...

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  2. Assertion :- Work done is positive when force acts in the direction of...

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  3. Statement 1: If is easter to pull a heavy object than to push it on a ...

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  4. Assertion :- When a man climbs the rope friction force acts in downwar...

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  5. Assertion :- According work energy theorem net work done on a body is ...

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  6. Assertion :- Mass and energy are not conserved separately,but are cons...

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  7. Assertion :- When a spring is elongated work done by spring is negativ...

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  8. A particle is moving on a circular path such that at any instant its p...

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  9. A car is moving along a circular track with tangential acceleration of...

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  10. A point mass moves along a circle of radius R with a constant angular ...

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  11. A car is moving on circular path of radius 100m such that its speed is...

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  12. A bob of mass m is attached at one end of a string of length l other e...

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  13. A ball of mass m inside a smooth spherical shell of radius R with velo...

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  14. A bead is arranged to move with constant speed around a loop that lies...

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  15. A particle is suspended from a string of length R. It is given a veloc...

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  16. The angular displacement (theta) of the blades of a ceiling fan, when ...

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  17. A wheel of radius R = 0.1 m is rolling without slipping on a horizonta...

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  18. Two identical rings each of mass m with their planes mutually perpendi...

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  19. The moment of inertia of a uniform flat disc about its own axis is I. ...

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  20. The diagram shows a uniform disc of mass M & radius 'a', if the moment...

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