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Newton’s First Law (law of inertia)

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**Newton’s First Law (law of inertia)**

An object at rest will continue to stay at rest unless an outside force acts on it and …

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**Newton’s First Law (law of inertia)**

an object in motion will continue to stay in motion at constant speed in a straight line unless an outside force acts on it

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**Newton’s First Law (law of inertia)**

FORCE is a push or a pull applied to an object that will cause it to start moving, stop moving or change its speed or direction

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**Newton’s First Law (law of inertia)**

FRICTION is the force that acts in the opposite direction of the motion of the object

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**Newton’s First Law (law of inertia)**

MASS is the measure of the amount of matter in an object measured in grams (g) or kilograms (kg)

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**Newton’s First Law (law of inertia)**

WEIGHT is a measure of the force of gravity on the mass of an object measured in Newtons (N)

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**Newton’s First Law (law of inertia)**

WEIGHT = MASS GRAVITY x MASS = WEIGHT GRAVITY /

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**Newton’s First Law (law of inertia)**

INERTIA is a property of an object that describes how hard it is to change the motion of the object more mass means more inertia

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**REVIEW QUESTIONS What is the difference between mass and weight?**

Which has more mass, 12 g of feathers or 12 g of lead? When an astronaut is living on the International Space Station, what happens to his mass?

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REVIEW QUESTIONS What would the mass of a dog be if it has a weight of 100N? What would the weight of an apple be if it has a mass of 1.5 kg? What is a force?

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**REVIEW QUESTIONS What is friction?**

What causes friction on a moving object?

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