3] A snowball picks up speed as it rolls down the mountain.
Explanation:
Newton's second law states that:
where
F is the net force acting on an object
m is the mass of the object
a is the acceleration of the object
When the net force acting on the object is zero, we say that the object is acted upon balanced forces; when the net force is non-zero, we say that unbalanced forces are acting on the object. From the formula, we see that when unbalanced forces are acting on the object, the object has an acceleration different from zero: this also means that the velocity of the object is changing.
So, we can say that if there are unbalanced forces, then the object's velocity is changing. Among the choices given, we see that velocity is changing only in options 3) (the snowball is speeding up, so it has an acceleration), while in all other cases the velocity is constant. Therefore, option 3) is the correct one.
Answer:
It's C because if you were trying to put it at rest that means you would put it on a Balanced surfest
Answer:
While Bohr's atomic model hypothesizes that electrons move in particular energy levels around the nucleus, the electron cloud model suggests that electrons move in an unpredictable pattern but are more likely to be in certain regions than others.
Explanation: