Simple Description

An object will stay stationary or move with constant velocity unless an unbalanced force acts on it.

Further Detail

In other words, if the forces on an object are unbalanced then the object will accelerate or change direction. Balanced forces (i.e. no resultant force) will cause the object to stay stationary or move in the same speed and direction.

Related Words:

• Newton's 2nd Law
• Newton's 3rd Law
• Resultant force
• Force

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