- Basic Math and Science Newton's Laws of Motion Questions and Answers Flashcards
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Newton's First Law of Motion states that an object at rest stays at rest unless acted upon by:
Answer: An unbalanced external force
The First Law (law of inertia) states objects maintain their state of motion unless an unbalanced force acts on them.
According to Newton's Second Law, what is the acceleration of a 5 kg object with a net force of 20 N?
Answer: 4 m/s²
F = ma, so a = F/m = 20 N / 5 kg = 4 m/s².
Newton's Third Law is best described as:
Answer: For every action, there is an equal and opposite reaction
The Third Law states that forces always come in equal and opposite pairs.
A 10 kg box is pushed with 50 N of force on a frictionless surface. What is the acceleration?
Answer: 5 m/s²
a = F/m = 50 N / 10 kg = 5 m/s².
What is inertia?
Answer: The tendency of an object to resist changes in its state of motion
Inertia is the resistance to changes in motion; it depends on mass — more mass means more inertia.
A car and a truck collide. According to Newton's Third Law, which experiences a greater force?
Answer: Both experience the same force
Newton's Third Law guarantees equal forces on both vehicles, though the smaller car accelerates more.