State whether each sentence is true or false and write a sentence or two explain

Question

State whether each sentence is true or false and write a sentence or two explaining your reasoning. Responses must be in complete sentences.

A. Any two objects with the same acceleration must be experiencing the same net force.

B. A spring exerts a force proportional to its length.

C. If you hold a pen in the palm of your hand and accelerate it upwards, you must push on the pen with a larger magnitude of force than then pen pushes on your hand.

D. Internal forces do not affect the motion of a system.

Explanation / Answer

A)False

Fnet = m a

having the same acceleration is not nough for them to have same net force. But if their masses are also same, then they will have same net force.(And it is not stated that they have same masses)

B)False

F = -kx

It is indeed propotional to the stretched length.

C)True

You just have to overcome the reaction force of the pen to ur palm to lift it up.

D)True

If u consider the whole system then the internal forces do not effect the motion.

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