The figure shows two horizontal forces acting on a block on a frictionless floor- If a third horizontal force F-3 also acts on the block- what are the magnitude and direction of F-3 when the block is moving to the left with a constant speed of 5 m - s-Refer Image

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Question

The figure shows two horizontal forces acting on a block on a frictionless floor. If a third horizontal force ${\to F}_{3}$ also acts on the block, what are the magnitude and direction of ${\to F}_{3}$ when the block is moving to the left with a constant speed of 5 m / s?
Refer Image

2 N leftward

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2 N rightward

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8 N leftward

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8 N rightward

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Solution

The correct option is A 2 N leftward
Block is moving at constant velocity,
This implies that the force acting on the body is zero.
For a balance of forces.
$F_{3}$ must act to the left.
$F_{3} + 3 = 5$
$F_{3} = 2 N$
Hence option A is correct.

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The figure shows two horizontal forces acting on a block on a frictionless floor. If a third horizontal force →F3 also acts on the block, what are the magnitude and direction of →F3 when the block is moving to the left with a constant speed of 5 m / s?Refer Image

The correct option is A 2 N leftwardBlock is moving at constant velocity,This implies that the force acting on the body is zero.For a balance of forces.F3 must act to the left.F3+3=5F3=2NHence option A is correct.

The figure shows two horizontal forces acting on a block on a frictionless floor. If a third horizontal force ${\to F}_{3}$ also acts on the block, what are the magnitude and direction of ${\to F}_{3}$ when the block is moving to the left with a constant speed of 5 m / s?
Refer Image

The correct option is A 2 N leftward
Block is moving at constant velocity,
This implies that the force acting on the body is zero.
For a balance of forces.
$F_{3}$ must act to the left.
$F_{3} + 3 = 5$
$F_{3} = 2 N$
Hence option A is correct.