Foundations of Physics by Tom Hsu

By Tom Hsu

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The steeper the angle, the larger the force of gravity directed along the ramp. As we will see, larger forces create more rapid increases in speed. Friction Friction is another variable. All motion creates friction. Friction acts to reduce motion, or slow things down. A certain fraction of the force of gravity is taken up by overcoming friction. If there were no friction, a ball would have even greater speed at the bottom of a ramp. Size, mass, and shape are also important variables The mass and size of the ball are also variables that affect its motion.

The sun is another example. 22: Atoms in a gas move fast and are separated by relatively large spaces. Application: Nanotechnology The prefix “nano” means extremely small. A nanometer is 10-9 meters, which is a thousand times smaller than a bacterium. Nanotechnology is the technology of creating devices the size of bacteria—or smaller. Nanotechnology is a relatively new area of science and engineering. Only in the past decade have scientists been able to manipulate atoms and matter on a small enough scale to make nanotechnology possible.

The division of science into separate fields was done to help people organize scientific knowledge. However, the concepts in all of the divisions of science are interrelated. Physics is sometimes called the fundamental science because it provides the conceptual framework that underlies all of science. Physics breaks down nature into its simplest processes such as the force between two objects. In contrast, chemistry, biology, and astronomy study complex interactions, such as the growth of an animal, the formation of a star, or the combustion of gasoline in air.

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