Question

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Answer 1

Answer:

Friction is the force that resists motion when the surface of one object comes in contact with the surface of another. The mechanical advantage of a machine is reduced by friction, or in other words, the ratio of output to input is reduced because of friction. An automobile uses one-quarter of its energy on limiting the friction. Yet, it is also friction in the tires that allows the car to stay on the road and friction in the clutch that makes it possible to drive. From matches to machines to molecular structures, friction is one of the most significant phenomena in the physical world. In this article, let us discuss frictional force and its different types.

A streamlined body is a shape that lowers the friction drag between a fluid, like air and water, and an object moving through that fluid. It offers a minimum resistance to air and water by its particular type of body shape . For aeroplanes the surface is having streamlined shape and for ships also in the water to reduce the fluid friction.

The force resisting the motion of a rolling body on a surface is known as rolling friction or rolling resistance. Rolling of ball or wheel on the ground is an example of Rolling friction.

Answer 2

Answer:

Force of friction - - - is the force applied on an object in opposite direction of gravitational force is called force of friction

Streamlined shape - - is the type of shape that is pointed from front and broad from last it is used to reduce frictional force

Rolling friction - - - friction produced by rolling objects is called rolling friction example - ___ tyres used in cars and carts

Force of adhesion ----- The force of adhesion is defined as the force of attraction between different substances, such as glass and water.

Sliding friction - - - it is a type of friction produced by sliding objects like boxes slippers etc