Question

multiple choice 1 point a box with a mass of 15.0 kg is being pushed on a level surface with a horizontal applied force. it just starts to slide when 40.0 n is applied and will continue to slide if 35.0 n is applied to the box. calculate the weight (fg) of the box. (remember that direction is part of force). -150 n 150 n -35.0 n 35.0 n -40.0 n 40.0 n -75.0 n 75.0 n -150. n 150. n none of these

Explanation:

Step1: Recall weight - force formula

The weight of an object is given by the formula $F_g = mg$, where $m$ is the mass of the object and $g$ is the acceleration due to gravity ($g= 9.8\ m/s^{2}\approx10\ m/s^{2}$). Here, $m = 15.0\ kg$.

Step2: Calculate the weight

$F_g=mg=15.0\ kg\times10\ m/s^{2}=150\ N$. The direction of the weight force is down - ward. In a coordinate system where the upward direction is positive and the downward direction is negative, the weight force $\vec{F}_g=- 150\ N$.

Answer:

-150 N