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According to Newton's first law, if the net force on an object is zero (), which statement must be true about its motion?
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6. Intro to Forces (Dynamics)
Newton's First & Second Laws
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Newton's First & Second Laws: What happens when a net (unbalanced) force acts on an object?
A
The object’s mass increases, preventing any change in motion.
B
The object moves with constant velocity because only balanced forces can change motion.
C
The object accelerates in the direction of the net force (its velocity changes).
D
The object remains at rest because unbalanced forces cancel out.
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Recall Newton's First Law, which states that an object will remain at rest or move with constant velocity unless acted upon by a net external force.
Understand that a net (unbalanced) force means the forces acting on the object do not cancel each other out, resulting in a nonzero total force.
Apply Newton's Second Law, which relates the net force \(\vec{F}_{net}\) acting on an object to its mass \(m\) and acceleration \(\vec{a}\) by the equation \(\vec{F}_{net} = m \vec{a}\).
Recognize that since \(m\) is constant and \(\vec{F}_{net}\) is nonzero, the object must experience an acceleration \(\vec{a}\) in the direction of the net force.
Conclude that this acceleration means the object's velocity changes, so it does not remain at rest or move with constant velocity when a net force acts on it.
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