Force and Laws of Motion (Chapter 9) of NCERT Class 9 Science Book is available here in PDF ... You also get to learn the three laws of motion or Newton's laws of motion.

Newton's laws of motion are the rock upon which classical physics have been built, but we may have been misinterpreting it for centuries.

This is due to Newton’s first law: object will continue at a constant ... Force is applied by the vehicle’s brakes in opposite direction to motion. The force of friction between tyres and ...

He also worked on the law of universal gravitation ... Naturalis Principia Mathematica. The book, which described Newton's theories on celestial motion and gravity, established his reputation ...

which said that objects only moved if an external force drove that motion. Newton was also the first to understand the rainbow, and to refract white light with a prism into its component colours ...