NEWTON’S 1st LAW

pushing, pulling, throwing, lifting, stopping, kicking, etc. Force & Newton’s 1st Law -A ____________ is a push or pull that affects matter. Forces can ___________, ___________, or change _______________ of an object’s motion. force start directions stop -Force is measured in _____________ ( ) -one ___________ is the force necessary to move 1 kilogram mass 1 meter per second squared. Newtons N Newton Examples of forces: ________________________________________________________________________________________________________________ pushing, pulling, throwing, lifting, stopping, kicking, etc.

NEWTON’S 1st LAW (Balanced Forces; The Law of Inertia) -Newton’s first law states that as long as the forces on an object _______________ each other, the object’s motion will not _________. balance change -Commonly stated as: -Objects in motion tend to stay in motion. -Objects at rest tend to stay at rest. -If an object is moving, it tends to keep moving at the same speed and in the same direction unless a force acts on it. -An outside force that offsets the balance can change either an object’s _______________ or _________________ or both. Ex. Ex. direction speed braking steering

change NO their masses inertia mass inertia momentum INERTIA -The term “inertia” is also commonly associated with Newton’s 1st law (also known as the “Law of Inertia”) -Inertia is the tendency of an object to resist any ___________ in its motion. -Is the inertia of a moving train the same as a fly moving at the same speed? __________ change NO -What is the difference? ___________ -The more ____________ an object has, the greater its ____________. -How is inertia different then momentum? An object that is not moving has NO ________________ but still has ____________. their masses inertia mass inertia momentum

force motion opposite air friction air resistance speed lubricant -Friction is the ___________ that opposes the __________ of a object when two surfaces rub each other. -The force of friction acts in a direction ___________ to the motion of an object. -One form of friction that often works against objects moving anywhere in our atmosphere is called ________________ or _________________ force motion opposite - air friction air resistance -The greater the friction the faster an object will lose ___________. -One way of reducing friction is to add a _________________. speed lubricant