Question

2 newtons first law of motion is also called the law of inertia. what statement below is not true of inertia?
a forces must be balanced for there to be a change in motion, direction, or speed.
b if an object is in motion, it will stay in motion until a force acts on it.
c if a force acts on an object, it can change its direction.
d forces must be unbalanced for there to be a change in motion, direction, or speed.

Explanation:

To determine the false statement about inertia (Newton's first law), we analyze each option:

• Option B: Aligns with inertia (objects in motion stay in motion unless a force acts).
• Option C: A force (unbalanced) can change direction, which is consistent with Newton's laws (a force causes acceleration, including directional changes).
• Option D: Unbalanced forces cause changes in motion (acceleration), which is correct (Newton's second law relates to net force, and first law implies unbalanced forces are needed for change).
• Option A: Inertia states that balanced forces (net force = 0) mean no change in motion (velocity). So "forces must be balanced for a change in motion" is false—unbalanced forces are required for such changes.

Answer:

A. Forces must be balanced for there to be a change in motion, direction, or speed.