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Connecting Motion with Force Force- a push or pull one body exerts on another. -Force does not always change velocity. Balanced forces- forces on an object that are equal in size and opposite in direction. Ex: Tug of War. Unbalanced (Net) Forceforces on an object are not equal in size or direction. - This causes a change in the velocity of the object. Inertia- the tendency of an object to resist any changes in its motion. - velocity remains the same unless a force changes it. - The more mass an object has, the greater its inertia. Ex: bowling ball vs. tennis ball st 1 Isaac Newton’s law of motion- A moving object will stay moving until a force stops it. An object at rest will stay at rest until a force moves it. - Also called the Law of Inertia. Friction- force that opposes motion between 2 surfaces that are touching each other. Ex: Friction is the force between you and the ground so you can walk.