Question

during a workout, a football player pushes a blocking dummy a distance of 30 m. while pushing the dummy the same distance a second time, what would the player need to change to be certain that power output increases? the player would need to use a greater force and take more time. the player would need to use a greater force and take less time. the player would need to use a smaller force and take more time. the player would need to use a smaller force and take less time.

Explanation:

Step1: Recall power formula

Power $P=\frac{W}{t}$, and work $W = F\times d$ (where $F$ is force and $d$ is distance). Given $d$ is constant ($d = 30$ m). So $P=\frac{F\times d}{t}$.

Step2: Analyze effect on power

To increase $P$, since $d$ is fixed, we can increase $F$ and decrease $t$. A greater force $F$ and less time $t$ will lead to a higher - power output.

Answer:

The player would need to use a greater force and take less time.