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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...
Explanation:
When a force causes displacement, the work done can be positive, negative, or zero. In this case, we are considering the scenario where the work done is positive. Let's break down the options and analyze them:
A: In its own direction:
- This means that the force and displacement are in the same direction.
- When a force acts in the same direction as the displacement, the work done is positive.
- For example, if you push a box forward and it moves forward, the force and displacement are in the same direction, resulting in positive work done.
B: In the direction opposite to the applied force:
- This means that the force and displacement are in opposite directions.
- When a force acts in the opposite direction to the displacement, the work done is negative.
- For example, if you push a box forward, but it moves backward, the force and displacement are in opposite directions, resulting in negative work done.
C: In the direction at right angles to the direction of the applied force:
- This means that the force and displacement are perpendicular to each other.
- When a force acts at a right angle to the displacement, the work done is zero.
- For example, if you push a box sideways, but it moves forward, the force and displacement are perpendicular, resulting in zero work done.
D: None of the above:
- This option is incorrect because one of the options (option A) is correct.
Therefore, the correct answer is A: in its own direction. When a force causes displacement in its own direction, the work done is positive.
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When a force causes displacement, the work done can be positive, negative, or zero. In this case, we are considering the scenario where the work done is positive. Let's break down the options and analyze them:
A: In its own direction:
- This means that the force and displacement are in the same direction.
- When a force acts in the same direction as the displacement, the work done is positive.
- For example, if you push a box forward and it moves forward, the force and displacement are in the same direction, resulting in positive work done.
B: In the direction opposite to the applied force:
- This means that the force and displacement are in opposite directions.
- When a force acts in the opposite direction to the displacement, the work done is negative.
- For example, if you push a box forward, but it moves backward, the force and displacement are in opposite directions, resulting in negative work done.
C: In the direction at right angles to the direction of the applied force:
- This means that the force and displacement are perpendicular to each other.
- When a force acts at a right angle to the displacement, the work done is zero.
- For example, if you push a box sideways, but it moves forward, the force and displacement are perpendicular, resulting in zero work done.
D: None of the above:
- This option is incorrect because one of the options (option A) is correct.
Therefore, the correct answer is A: in its own direction. When a force causes displacement in its own direction, the work done is 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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