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Carole is very tired and makes coffee. Why would Newton say that she must use her hand to pick up the cup? A) The idiom that every action has an equal and opposite reaction applies. B) An object at rest will stay in at rest unless acted upon by an external force. C) Acceleration of the object is indirectly proportional to the balanced forces. D) The coffee's inertia accelerates with the force due to the unbalanced forces

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AL2006

Carole is very tired and makes coffee. Newton would say that she must use her hand to pick up the cup, because an object at rest will stay at rest unless acted upon by an external force. (B)

Answer:

The correct answer is  option B.

Explanation:

Newton laws of motion:

1.An object will remain at rest or in motion in a straight line unless an external force tries to change its state.

2. The force is equal to the change in momentum with respect to time.

        Force = mass × Acceleration

3. Every action has an equal and opposite reaction.

So, when in order to pick her cup she has to exert some force on cup which was at rest. Moment she exerts the force on cup to pick she just changes its state from rest to motion.

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