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Why does objects moving in fluids have special shapes?

Important Questions on Energy

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Physics>Change>Energy>Dissipation of Energy
You skid a lot more while you are wearing socks. Why?
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Physics>Change>Energy>Dissipation of Energy
The eraser gets smaller and smaller as you use it more and more. Explain the reason.
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Physics>Change>Energy>Dissipation of Energy
Name the force responsible for wearing out of a bicycle tyre.
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Physics>Change>Energy>Dissipation of Energy

As shown in the picture, keep the book in a sloping position on a plain surface and roll a marble on it. Now spread a rug on the plain surface and roll the marble again.

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Out of two surfaces, which surface was able to produce more friction?
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Physics>Change>Energy>Dissipation of Energy

Explain why vehicles are designed to have a specific shape.

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Physics>Change>Energy>Dissipation of Energy
Friction :
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Physics>Change>Energy>Dissipation of Energy
Suppose Rahul is swimming in a pool of sugar syrup instead of water. What kind of physical forces are acting on Rahul while swimming?
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Physics>Change>Energy>Dissipation of Energy

Write the quadrants in which the following points lie:

-4,7

EASY
Physics>Change>Energy>Dissipation of Energy
List three disadvantages of friction.
HARD
Physics>Change>Energy>Dissipation of Energy
A piece of chalk wears out as it used on a black board.
EASY
Physics>Change>Energy>Dissipation of Energy
When a machine is operated, the _____ generated causes wastage of energy.
EASY
Physics>Change>Energy>Dissipation of Energy
Objects moving in fluids does not require a specific shape.
EASY
Physics>Change>Energy>Dissipation of Energy
The frictional force acts in the direction of motion of body.
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Physics>Change>Energy>Dissipation of Energy
Why do you think we slip on a banana peel?
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Physics>Change>Energy>Dissipation of Energy
What do you feel when you touch a nail immediately after it is hammered into a wooden plank? Why?
EASY
Physics>Change>Energy>Dissipation of Energy
When you apply the brakes, a bicycle stops and the rims of its wheels become hot. Explain the reason.
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Physics>Change>Energy>Dissipation of Energy
Cotyledons are also called-
EASY
Physics>Change>Energy>Dissipation of Energy
Energy is wasted in overcoming friction.
HARD
Physics>Change>Energy>Dissipation of Energy
Sparks are produced when a pair of scissors is sharpened against a grinding wheel.
EASY
Physics>Change>Energy>Dissipation of Energy
Friction produces heat.