# Newton’s First Law

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

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 …

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

Newton’s First Law (law of inertia)

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

FORCE

Newton’s First Law (law of inertia)

FRICTION

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

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)

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)

Newton’s First Law (law of inertia)

Newton’s First Law (law of inertia)

is a property of an object that describes how hard it is to change the motion of the object
more

INERTIA

mass means more inertia

REVIEW QUESTIONS
1.

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?

2.

3.

REVIEW QUESTIONS
4.

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?

5.

6.

REVIEW QUESTIONS
7. 8.

What is friction? What causes friction on a moving object?

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 views: 314 posted: 4/23/2008 language: pages: 12