""Physics is all around us. It is in the electric light you turn on in the morning; the car you drive to work; your wristwatch, cell phone, CD player.. It makes the stars shine every night and the sun shine every day, and it makes a baseball soar into the stands for a home run. Physics is the science of matter, energy, space, and time. There are many fields of physics, for example: mechanics, electricity, heat, sound, light, condensed matter, atomic physics, nuclear physics, and elementary particle physics. Physics is the foundation of all the physical sciences-such as chemistry, material science, and geologybiology, medicine, computing, ... So also Mechanics is an important field of physics. Developed by Sir Isaac Newton in the 17th century, the laws of mechanics and the law of gravity successfully explained the orbits of the moon around the earth and the planets around the sun. This study teaches simple physics principles to the college-level students and other people interest in daily-life physics..""