Question

multiple choice
without which of the following will a moving object keep moving in addition to its speed and direction remaining the same?
a unbalanced force
b balanced force
c inertia
d acceleration
attempt 1 of 2

Explanation:

To solve this, we analyze each option:

• Option A: An unbalanced force causes a change in motion (acceleration). So, without an unbalanced force, an object in motion will continue with constant speed and direction (Newton's first law).
• Option B: Balanced forces mean net force is zero, but the question is about what's absent for motion to remain constant. Balanced forces are a state, not what's "without" for motion to persist.
• Option C: Inertia is a property (objects resist motion change), but it's always present, not something that can be "without" in the context of this question.
• Option D: Acceleration is a result of unbalanced forces; it's not a force itself, so the question is about a force - related factor.

So the correct answer is A as an unbalanced force is what would change the motion, and without it, the object keeps moving with constant speed and direction.

Answer:

A. unbalanced force