Unbalanced Force
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Example:
Imagine trying to push a heavy piece of furniture across a carpeted floor when you're the only one pushing. Just like how one person might struggle to move the furniture unless they exert enough force, an object will only change its motion if an unbalanced force acts upon it. The connection here is that just as you need to push harder to overcome friction and move the furniture, an unbalanced force must overcome other forces (like friction or gravity) to change an object's motion.
Practice Version
Unbalanced Force: Forces acting on an object to cause a change in motion unbalanced force. An unbalanced force occurs when the total forces on an object do not equal zero, causing it to accelerate.