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Yes. For instance, say a box is sliding at me at some speed. I push back with a force of 25N directly against the path of the box. Suppose that I stop the box after it goes 25m. So, I pushed against the box, or in the negative direction. The displacement was in the positive direction. So, if W=Fs and -25N=F and s=25m, W=Fs=-25N*25m=-625J.

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14y ago
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13y ago

A moving object may, or may not have a force acting on it. It takes some kind of force to cause an object to move to begin with, but if it is already in motion, it may not have any force acting on it any more. The object's inertia would be keeping it moving. There does not have to be a force acting on an object if it is moving. A small chunk of rock gliding along in deep space is just "coasting" through the nearly perfect vacuum of the region. It really isn't being acted on by anything because there really isn't that much there to create a force to act on that rock.

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Q: If an object is moving does there have to be force acting on it?
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