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If the horizontal velocity is constant, then the horizontal acceleration is zero,

and the net horizontal force is zero.

But if you are saying that the body was in constant motion and after that the force was applied, then the body will acccelerate because of the force. The net force applied on the body would be equal to the force applied to it when the body was in constant motion as here the force is in direction of the motion and hence the angle will be 0 giving the value of cos 0º as 1. Hence there would be no reduction in the net force

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12y ago
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12y ago

If the box's horizontal velocity is constant, then its horizontal acceleration is zero.

That tells us that the net horizontal force is zero, so the friction force pushing

backwards must be exactly equal to the man's force pushing forward = 100 N.

The laws of Physics have not changed since you posted the same question,

and we answered it, 12 hours earlier.

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12y ago

If the box's horizontal velocity is constant, then its horizontal acceleration is zero.

That tells us that the net horizontal force is zero, so the friction force pushing

backwards must be exactly equal to the man's force pushing forward = 100 N.

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14y ago

the net force is 0 N since it is at a constant speed. and all forces up has to equal forces down so you subtract. so the answer is zero newtons (N)

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13y ago

Net force is 0 newtons because nothing is acting on the crate.

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14y ago

If the speed is constant, then the forces are balanced, i.e. they add up to zero.

100N of kinetic friction (backwards) is balancing the 100N push (forward).

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12y ago

If the horizontal velocity is constant, then the horizontal acceleration is zero,

and the net horizontal force is zero.

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Q: A horizontal force of 100 N pushes a box across a floor at a constant speed. what is the force of friction acting on the box?
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