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**Force/Newton’s First Law Notes**

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**Force/Newton’s First Law Notes**

Force is any interaction between any two objects or an object and its environment. Two types of forces: Contact forces are usually pushes or pulls that result from direct contact between objects. Field forces do not result from direct contact but can act over a great distance. Gravity, electric, and magnetic forces are all examples of field forces.

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**Force/Newton’s First Law Notes**

Forces are vector quantities which means that they have both a magnitude and a direction. The standard unit for force is the Newton (N), which is equal to Kilogram x Meters/seconds/seconds (kg m/s)

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**Force/Newton’s First Law Notes**

Force diagrams are visual representations of objects with force vectors drawn emanating from the center of the object and pointing in the direction of the force. Free body diagrams are force diagrams of only one object. Look at example on pg

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**Force/Newton’s First Law Notes**

Newton's first law (Law of inertia) states that an object can't change either its direction or speed of motion (accelerate) unless it interacts with another object (force).

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**Force/Newton’s First Law Notes**

Even if a force does act on an object, the object still might not accelerate if that force is balanced (canceled) by another force. An unbalanced force is one which is not canceled by another, and it will always cause acceleration. A net force is the vector sum of all forces acting upon an object.

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**Force/Newton’s First Law Notes**

Equilibrium is a situation in which all forces balance out and the net force is zero. Mass is measured in kilograms and is a measure of inertia. It is the property of all matter which causes it to resist any change in its direction, or speed of motion.

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Welcome to Physical Science. Inertia The Tendency of things to resist changes in motion.

Welcome to Physical Science. Inertia The Tendency of things to resist changes in motion.

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