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My physics textbook describes negative work in cases where the force and displacement act in opposite directions. But I don't understand how work would be negative in the formula:

W = F • d • cos Θ

If the angle theta is 180 degrees, then the result of the cosine of 180 degrees would be -1. Let's say force is a negative value and displacement is a positive value (opposite vector directions). In this case, negative*negative*positive=positive?

Thank you,

Chris