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Matter In Our Surroundings

Question
CBSEENSC9006310
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What is the work done when the direction of displacement and the direction of force F acting on a body are perpendicular to each other?

Solution

When direction of displacement and direction of force F acting on a body are both perpendicular to each other, work done is zero. The component of the force acting on a body in the direction of its displacement is zero in this case.

Mathematically,

                   W = Fs cos 90° = 0.

Some More Questions From Matter In Our Surroundings Chapter

Convert the following temperature to Celsius scale.

300K

Convert the following temperature to Celsius scale.

573 K

Convert the following temperatures to Kelvin scale

25°C

What is the physical state of water at

100 °C

For any substance, why does the temperature remain constant during the change of state ?

Suggest a method to liquify atmospheric gases.

Convert the following temperatures to Kelvin scale.

35°C

Give reason for the following observations.

Naphthalene balls disappear with time without leaving any solid.

Give reason for the following observations.

We can get the smell of perfume sitting several metres away.

What is the physical state of water at

a) 25°C
b)00C
c)1000C

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