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<p>
Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics.
They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces.
More precisely, the first law defines the force qualitatively, the second law offers a quantitative measure of the force,
and the third asserts that a single isolated force doesn't exist.
</p>
<p>
Select the correct statements regarding the Newton's law:
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<pl-checkbox answers-name="laws" min-correct="2" max-correct="2" number-answers="3" partial-credit="net-correct">
<pl-answer correct="true">
In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity,
unless acted upon by a force.
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<pl-answer correct="false">
In an inertial frame of reference, an object remains at rest unless acted upon by a force.
</pl-answer>
<pl-answer correct="true">
In an inertial frame of reference, the vector sum of the forces $F$ on an object is equal to the mass $m$ of
that object multiplied by the acceleration $a$ of the object (assuming a constant mass).
</pl-answer>
<pl-answer correct="true">
When one body exerts a force on a second body, the second body simultaneously exerts a force equal in
magnitude and opposite in direction on the first body.
</pl-answer>
<pl-answer correct="false">
When one body exerts a force on a second body,
the second body will move with positive acceleration away from the first body.
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<pl-question-panel>
<p>
<small>
This question uses material from the Wikipedia (https://en.wikipedia.org/wiki/Newton%27s_laws_of_motion)
</small>
</p>
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