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

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

3. Force

6. 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.

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

12. Measuring weight in pounds

13. 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?