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How can force of friction be reduced ?...

How can force of friction be reduced ?

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Force of friction is measured in:

When brakes are applied in a car,the brake-shoes apply frictional force on the wheels.these forces are internal for the system(car).For retardation,external forces ust act on the system.The force of friction at the road surface remains the same before and after teh brakes are applied (f = mu N) .How does the car stop?

In which direction the force of friction acts?

Can force of friction on a body be zero even if it is placed on a rough surface?

JBD PUBLICATION-Model Test Paper 12-EXERCISE
  1. Two masses 20 kg and 50 kg attract each other with a force 5 gf. Fid t...

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  2. Why is it painful to walk bare footed on a road covered with edged peb...

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  3. Derive the relation between linear velocity and angular velocity.

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  4. A boy wants to throw a ball to his friend across the street 40 m wide....

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  5. How can force of friction be reduced ?

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  6. A body of mass 5 kg placed on the surface of rough inclined plane risi...

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  7. State and prove work energy theorem.

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  8. State Keplers' laws of planetary motion.

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  9. What is Stokes' law? Derive the relation by method of dimensions.

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  10. What is an oscillartory motion?

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  11. What are statiionary waves?State their characteristics.

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  12. Define an echo?

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  13. Find the relations for the first harmonic produced by an open end orga...

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  14. Define terminal velocity and find an expression for it.

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  15. What is Poisson's ratio? Give its expression. What are its units?

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  16. State Newton's law of cooling.

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  17. Define centre of mass of a rigid body.

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  18. Drive the equations of rotatory motion, omega^2 - omega0^2 = 2 alpha t...

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  19. State the principle of conservation of angular momentum.

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  20. Define the theorem of parallel axes and apply it to find the moment of...

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