Question

A body displaces by 4m along a line making an angle of 60° with line of action of force of 10 N then work done by the force is:

○Zero

○10 j

○20 J

○40 J

​

Answer 1

$\huge{\boxed{\rm{Question}}}$

A body displaces by 4m along a line making an angle of 60° with line of action of force of 10 N then work done by the body is:

• Zero
• 10 J
• 10 J20 J
• 40 J

$\huge{\boxed{\rm{Answer}}}$

$\large{\boxed{\boxed{\sf{Given \: that}}}}$

A body displaces by 4m along a line making an angle of 60° with line of action of force of 10 N

Means,

Displacement of the body = 4 m.

Angle on which body is moving = 60°

Action of force on the body = 10N

$\large{\boxed{\boxed{\sf{To \: find}}}}$

$\large{\boxed{\boxed{\sf{Solution}}}}$

Work done by the body is 20 J

$\large{\boxed{\boxed{\sf{We \: also \: write \: these \:}}}}$

• Unit of force as N.
• Unit of force as N.Angle on which body is moving as
• Displacement as s
• Joules as J

$\large{\boxed{\boxed{\sf{Using \: formula}}}}$

Work done (formula)

Work done (formula)W = F s cosθ

$\large{\boxed{\boxed{\sf{What \: does \: the \: question \: says}}}}$

$\large{\boxed{\boxed{\sf{Let's \: understand \: the \: concept \: 1st}}}}$

This question says that there is a body displaces by 4 m along a line making an angle of 60° with line of action of force of 10 N then work done by the force is ? Some options are given below as hints.

❶ Zero

❷ 10 J

❸ 20 J

❹ 40 J

$\large{\boxed{\boxed{\sf{How \: to \: solve \: this \: question}}}}$

$\large{\boxed{\boxed{\sf{Let's \: see \: the \: procedure \: now}}}}$

• To solve this question we have to use only a rule to find work done by body and we already know that rule.
• The rule is W = F s cosθ. Now putting the values according to this formula we get our final result that is 20J . J mean Joules.

$\large{\boxed{\boxed{\sf{Full \: solution}}}}$

Now we have to out the values according to the formula to find work done. And the rule is W = F s cosθ.

Using formula,

W = F s cosθ.

Where,

W means work doned.

θ means angle on which body is moving

s means displacement.

Putting the values,

W = F s cosθ.

W = 10 × 4 × cos60°

W = 40 × cos60°

The value of cos60° is ½

W = 40 × ½

W = 20

Hence, 20J is the answer.

Answer 2

Question:-

A body displaces by 4m along a line making an angle of 60° with line of action of force of 10 N then work done by the body is:

Zero

10 J

10 J20 J

40 J

$\huge{\rm{Answer}}}$

$\large{\sf{Given \: that}}}}$

A body displaces by 4m along a line making an angle of 60° with line of action of force of 10 N

Means,

Displacement of the body = 4 m.

Angle on which body is moving = 60°

Action of force on the body = 10N

$\large{\boxed{\boxed{\sf{To \: find}}}}1$

$\large{\boxed{\boxed{\sf{Solution}}}}$

Work done by the body is 20 J

$\large{\sf{We \: also \: write \: these \:}}}}$

Unit of force as N.

Unit of force as N.Angle on which body is moving as

Displacement as s

Joules as J

$\large{\sf{Using \: formula}}}}$

Work done (formula)

Work done (formula)W = F s cosθ

What does the question says

$\large{\sf{Let's \: understand \: the \: concept \: 1st}}}}$

This question says that there is a body displaces by 4 m along a line making an angle of 60° with line of action of force of 10 N then work done by the force is ? Some options are given below as hints.

❶ Zero

❷ 10 J

❸ 20 J

❹ 40 J

How to solve this question:-

Let's see the procedure now

To solve this question we have to use only a rule to find work done by body and we already know that rule.

The rule is W = F s cosθ. Now putting the values according to this formula we get our final result that is 20J . J mean Joules.

Solution:-

Now we have to out the values according to the formula to find work done. And the rule is W = F s cosθ.

Using formula,

W = F s cosθ.

Where,

W means work doned.

θ means angle on which body is moving

s means displacement.

Putting the values,

W = F s cosθ.

W = 10 × 4 × cos60°

W = 40 × cos60°

The value of cos60° is ½

W = 40 × ½

W = 20

Hence, 20J is the answer.