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Work done is said to be positive when a force causes displacement:
- a)In its own direction
- b)In the direction opposite to the applied force
- c)In the direction at right angles to the direction of applied force
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
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Work done is said to be positive when a force causes displacement:a)In...
Work done is said to be positive when a force causes displacement:
To understand why work done is said to be positive when a force causes displacement, let's break down the concept and consider each option given.
A: In its own direction
- This means that the force and displacement are in the same direction.
- When a force is applied in the same direction as the displacement, work is done.
- Example: Pushing a box forward along a horizontal surface.
B: In the direction opposite to the applied force
- This means that the force and displacement are in opposite directions.
- When a force is applied in the opposite direction to the displacement, work is done, but it is considered negative.
- Example: Slowing down a moving object by applying a force in the opposite direction to its motion.
C: In the direction at right angles to the direction of applied force
- This means that the force and displacement are perpendicular to each other.
- When a force is applied at a right angle to the displacement, no work is done because there is no component of the force in the direction of displacement.
- Example: Pushing a box sideways without causing it to move forward or backward.
D: None of the above
- This option implies that work done can occur in a different scenario not covered by options A, B, or C.
- However, this is not the case as work done is only considered positive when the force and displacement are in the same direction.
Conclusion:
The correct answer is option A: In its own direction. When a force causes displacement in the same direction, work is done and it is considered positive.
To understand why work done is said to be positive when a force causes displacement, let's break down the concept and consider each option given.
A: In its own direction
- This means that the force and displacement are in the same direction.
- When a force is applied in the same direction as the displacement, work is done.
- Example: Pushing a box forward along a horizontal surface.
B: In the direction opposite to the applied force
- This means that the force and displacement are in opposite directions.
- When a force is applied in the opposite direction to the displacement, work is done, but it is considered negative.
- Example: Slowing down a moving object by applying a force in the opposite direction to its motion.
C: In the direction at right angles to the direction of applied force
- This means that the force and displacement are perpendicular to each other.
- When a force is applied at a right angle to the displacement, no work is done because there is no component of the force in the direction of displacement.
- Example: Pushing a box sideways without causing it to move forward or backward.
D: None of the above
- This option implies that work done can occur in a different scenario not covered by options A, B, or C.
- However, this is not the case as work done is only considered positive when the force and displacement are in the same direction.
Conclusion:
The correct answer is option A: In its own direction. When a force causes displacement in the same direction, work is done and it is considered positive.
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Work done is said to be positive when a force causes displacement:a)In its own directionb)In the direction opposite to the applied forcec)In the direction at right angles to the direction of applied forced)None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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