Question

A body of mas to kilogram is moving in a circular path of radius 2 metre. How much work is done on the body?
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Answer 1

Answer:

• 0 Joules

Explanation:

Given:-

• Radius of Circular Path ,r = 2 metre.
• Mass of Body ,m = 1 kg

To Find:-

• Work Done ,W

Solution:-

Here, we have to calculate the Work done by the body .

As we know that the angle between the speed and displacemet is 90°

• Work Done = Fs Cos∅

→ W = FsCos∅

Where,

• W denote Work Done
• F denote Force
• S denote Displacemet
• ∅ denote angle between Speed & Displacemet.

Substitute the value we get

→ W = Fs × 0

As Cos90° = 0

→ W = 0

• Hence, the work done by the body is 0 Joules.

Answer 2

Answer:

Given :-

• Mass of body (M) = 1 kg
• Radius of path (R) = 2 m

To Find :-

Work done

Solution :-

As we know that

$\huge \bf \: W = Fs \: \cos \theta$

Here,

W is the work done

F is the Force

S is the Displacement

∅ is the angle between speed and displacement

$\tt \: W = Fs \: \times 0$

As cos 90⁰ = 0

$\tt \: W = 0$

Hence :-

The work done by the body is 0 Joule.