Multiple Choice
According to Newton's Second Law, the net force on an object depends on both its mass and acceleration. Which equation correctly expresses this relationship?
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6. Intro to Forces (Dynamics)
Newton's First & Second Laws
Multiple Choice
In the context of Newton's First and Second Laws, which statement best defines an unbalanced force acting on an object?
A
A force that always points in the direction of motion and has magnitude .
B
A situation where all forces are equal in magnitude and opposite in direction so the net force is , causing constant velocity.
C
Any force acting on an object that is moving at a constant speed in a straight line.
D
A net force not equal to zero, meaning the vector sum of all forces on the object is , which can cause acceleration.
Verified step by step guidance1
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 an unbalanced force means the vector sum of all forces acting on the object is not zero, i.e., \(\text{F}_{\text{net}} \neq 0\).
Recognize from Newton's Second Law that when \(\text{F}_{\text{net}} \neq 0\), the object experiences acceleration according to the equation \(\text{F}_{\text{net}} = m \cdot a\), where \(m\) is mass and \(a\) is acceleration.
Note that if all forces are balanced (net force zero), the object moves with constant velocity or remains at rest, so no acceleration occurs.
Therefore, an unbalanced force is best defined as a net force not equal to zero, causing the object to accelerate.
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