Question

newtons laws of motion - physics girl
newtons laws of motion - physics 101 / ap physics 1 review - dianna cowern
physics girl
multiple - choice question
if $\sum f = 0$, then
a = 0.
v = 0.
m = 0.
rewatch

Explanation:

Step1: Apply Newton's second law

Newton's second law is \(F = ma\). If \(\sum F=0\), then \(0 = ma\).

Step2: Analyze the equation

Since mass \(m\) (of a non - massless object) cannot be \(0\) in normal physical situations (mass is a fundamental property of matter and for real - world objects we consider in basic mechanics, \(m>0\)), we can divide both sides of the equation \(0 = ma\) by \(m\). So, \(a=\frac{0}{m}=0\).
For velocity \(v\), when \(\sum F = 0\), the object is in a state of uniform motion (could have a non - zero constant velocity, e.g., an object moving with constant speed in a straight line in the absence of net force). And mass \(m\) of a physical object (not a theoretical point with no mass in some extreme non - physical sense we don't consider here) is non - zero.

Answer:

a = 0.