Question

8 for work to be done, the ____________ must be applied in the same direction that the object moves. a power b force c efficiency d mechanical advantage

Explanation:

Work is calculated as \(W = F\times d\times\cos\theta\), where \(F\) is force, \(d\) is displacement, and \(\theta\) is the angle between the force and displacement. When \(\theta = 0^{\circ}\) (force and displacement in the same direction, \(\cos\theta=\cos0^{\circ} = 1\)), work is maximized. Power (\(P=\frac{W}{t}\)) is the rate of doing work. Efficiency (\(\eta=\frac{W_{output}}{W_{input}}\times100\%\)) is a measure of how well energy is used. Mechanical advantage (\(MA=\frac{F_{output}}{F_{input}}\)) is related to force - amplification in machines. Only force is directly related to the direction - displacement condition for work.

Answer:

B. force