Newton 1st Law of Motion.

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Presentation transcript:

Newton 1st Law of Motion

Review: Forces _________________________________________ Combination of all forces acting on a body Body does not accelerate Remains at rest or constant velocity Net force = 0 Body accelerates (changes rest or motion) Net force not equal to 0N Occurs only when there are unbalanced forces present

SIR ISAAC NEWTON Described the relationship between _________________________________________ and _______________________________________ in 3 laws.

INERTIA: the tendency of an object… to _________________________________________ until an outside force acts on the object. or if the object is moving: to resist a change in __________________________ until an __________________________________________ _ acts on the object. Basically, objects want to keep on doing what they’re doing.

INERTIA is related to an object’s MASS. Mass is a measure of inertia. SI unit for mass is __________________________(____) More ______________ means more _________________ Objects with __________________________ masses can be accelerated with ________________________ forces. A baseball will accelerate much faster when hit by a bat than a bowling ball hit by the same bat.

NEWTON’S FIRST LAW OF MOTION: an object at rest _____________________________________________ unless it experiences an unbalanced force and an object in motion _____________________________________________ unless it experiences an unbalanced force. Also called the ____________________________

Examples Using ‘inertia’, explain what happens to the dummies in the crash vehicle clip.

Examples What is happening when you slip and fall on ice. Friction: Inertia: Force: