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Learn about the connection between motion and force, including balanced and unbalanced forces, inertia, Newton's 1st law of motion, and friction.
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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) Force- forces 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
Isaac Newton’s 1st 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.