First law of motion

Newton’s first law of motion states that:

A body remains at rest, or in motion at a constant speed in a straight line, unless it is acted upon by a force.

What does this mean?

What this basically means is that:

• If an object isn’t moving, it won’t start moving unless a force is applied to it.
• If an object is moving, it won’t change its velocity (speed or direction), again, unless a force is applied to it.