Teacher: Jorge Fernandez-Velasco

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Presentation transcript:

Teacher: Jorge Fernandez-Velasco FORCES Chapter 13.1 Types of Forces, Causes of Forces, Units of Force Teacher: Jorge Fernandez-Velasco

What is a force? How are forces created? What are the four elementary forces?

Force

The four elementary forces All of the forces we know of in the universe come from four elementary forces. Fundamentally, forces come from the interaction between atoms and energy.

One pound (1Lb.) = 0.454 Kilograms (Kg) Two pounds (2 Lb.) = 0.918 Kilograms 1 Kg____ = 1.00Kg 1 Lb 0.454 Kg  1 Kg = 2.2 Lb.

Measuring weight in pounds

If One pound = 4.45 newtons. (approximate)  100-pound = 445 newtons The relationship between The newton is a smaller unit of force than the pound. The pound and the newton One pound of force equals 4.45 newtons.  1 Lb = 4.45 N  How much would a 100-pound person weigh in newtons? If One pound = 4.45 newtons. (approximate)  100-pound = 445 newtons  How much do you weigh in pounds? How much do you weigh in newtons?