Understanding Newton's First Law of Motion

What is Newton's first law of motion?

A) An object in motion stays in motion

B) An object at rest stays at rest

C) An object will move and stop somewhere in between

D) An object shatters upon impact

Answer:

When a customer slides an empty beer mug down the bar counter, the mug moves and stops somewhere in between.

Newton's first law of motion, also known as the law of inertia, states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. In the scenario described, the empty beer mug is initially at rest. When the customer slides the mug, they are applying a force to it that causes it to move. However, due to the force of friction between the mug and the counter, the mug will eventually come to a stop, demonstrating Newton's first law of motion.