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when work is positive and when playing is negative
Yes Work can be positive or Negative.
Yes, torque can have a negative value in physics. Torque is vector energy. Torque is the vector analogue of Work involving force (F) and displacement (D) vectors and the angle (FD). For example Work W = -F.D= -|FD|cos(FD) and Toque T = FxD =|FD|sin(FD). Torque can be negative dependent on the sine(FD). Work and torque is an example of the quaternion nature of physics; for example Quaternion energy E = FD = -F.D + FxD, the real energy is called work F.D and the vector energy is called torque, FxD.
No. In the case of 5 + (-3), for example, the positive number 2 is the solution. The sum would only be negative if the absolute value of the negative number is greater than the positive number.
Negative. Example: 3/-3= -1