2 Force Can you define it? Definition: The cause of acceleration, or the change in an object’s velocity(or the push or pull on an object)How can velocity change?Many forces can act on an object at once.The combination of all these forces is called…Net Force
3 Balanced and Unbalanced Balanced ForcesAll forces on the object combine for a net force of zeroBalanced forces do not change the object’s motionThe object can be moving, but there is no changeUnbalanced ForcesForces acting on the object combine to produce a nonzero net forceAll the forces combine to act like a single force on the objectMotion is affected by an unbalanced force
4 Friction What is friction? Definition: A force between two objects that are in contact that opposes the motion of either objectFriction happens as long as there is…contact
5 Friction Frictional force varies with surface Air Resistance Examples A form of friction between a moving object and air moleculesDepends on the size and shape of the object
6 Gravity What is gravity? Definition: Gravity does not require contact The force of attraction between two particlesGravity does not require contactAffected by mass and distanceNot a one-way street
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