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What is the formula for work (MCAT Physics MCQ)

QUESTION: What is the formula for work?

ANSWER: Work = Force X Distance   (W = Fd)

FORMULA #1
More specifically:  If a force F that is constant with respect to time acts on an object while the object is displaced in a straight line along the length and direction of a vector d, the mechanical work done by the force on the object is the dot product of the vectors F and d:

W = \bold{F} \cdot \bold{d} = F d \cos\theta

FORMULA #2
In
physics, work is the amount of energy transferred to a body by a force acting through a distance in the direction of the force. Like energy, it is a scalar quantity, with SI units of joules.  According to the work-energy theorem, if one or more external forces act upon a rigid object, causing its kinetic energy to change from Ek1 to Ek2, then the mechanical work (W) done by the net force is equal to the change in kinetic energy. For translational motion, the theorem can be specified as:[3]

W = \Delta E_k = E_{k_2} - E_{k_1} = \tfrac12 m (v_2^2 - v_1^2) \,\!

where m is the mass of the object and v is the object’s velocity.

Youtube videos on Work and Energy

NEXT QUESTION: Determine the amount of work that would be performed by a constant horizontal 25 Newton force if that force pushed a 75 kilogram rock 15 meters across a horizontal surface.

Source: http://en.wikipedia.org/wiki/Work_%28physics%29

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