Connecting Motion with Connecting Motion with ForceForce

ForceForce- a push or pull one body - a push or pull one body exerts on another.exerts on another.

-Force does not always -Force does not always change velocity.change velocity.

Balanced forces-Balanced forces- forces on forces on an object that are equal in size an object that are equal in size and opposite in direction.and opposite in direction.

Ex: Tug of War.Ex: Tug of War.

Unbalanced (Net) Force-Unbalanced (Net) Force- forces on an object are not forces on an object are not equal in size or direction. equal in size or direction.

- This causes a change in the - This causes a change in the velocity of the object.velocity of the object.

InertiaInertia- the tendency of an - the tendency of an object to resist any changes in object to resist any changes in its motion.its motion.

- velocity remains the same - velocity remains the same unless a force changes it.unless a force changes it.

- The more mass an object - The more mass an object has, the greater its inertia.has, the greater its inertia.

Ex: bowling ball vs. tennis ballEx: bowling ball vs. tennis ball

Isaac Newton’s 1Isaac Newton’s 1stst law of law of motion-motion- A moving object will A moving object will stay moving until a force stops stay moving until a force stops it. An object at rest will stay at it. An object at rest will stay at rest until a force moves it.rest until a force moves it.

- Also called the - Also called the Law of InertiaLaw of Inertia..

FrictionFriction- force that opposes - force that opposes motion between 2 surfaces motion between 2 surfaces that are touching each other.that are touching each other.

Ex: Friction is the force Ex: Friction is the force between you and the ground between you and the ground so you can walk. so you can walk.