Question

what is newtons first law of motion? fill in the blank: newtons first law of motion states that an object at rest or in motion will remain at rest or in motion unless acted upon by an __________ force.

Explanation:

Newton's first law of motion, also known as the law of inertia, states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. An unbalanced force changes the state of motion of an object. Internal forces (within a system) cancel out according to Newton's third law. Balanced forces result in no net force (so no change in motion). While external forces can be balanced or unbalanced. But the key term here based on the law's exact wording is "unbalanced" as it's the unbalanced force that causes a change in motion (which is what the law is highlighting - the condition for a change from the state of rest or uniform motion).

Answer:

unbalanced