ساينس الصف الأول الاعدادي – الفصل الدراسي الاول ساينس اولي اعدادي ترم اول In This part we will study : Potential energy It is the stored energy in the object due to the work done on it. Factors affecting the potential energy : Weight of the object. Height of the object from the ground. Weight = Mass x Acceleration due to gravity Newton kg m/sec2 Potential Energy (P.E.) = Weight (w) x Height (h) Joule Newton Metre Kinetic energy It is the work done during the motion of an object. Factors affecting the kinetic energy : 1. Mass of the object – If two cars, one has a mass larger than the other, are moving at the same speed. Which one needs more work to stop ? The kinetic energy of a moving object increases by increasing the mass of the object. So, the work done to stop it increases. 2. Speed of the object – If two cars of identical mass and one car is moving faster than the other. Which one needs more work to stop ? The kinetic energy of a moving object increases by increasing the speed of motion. So, the work done to stop it increases. لمتابعة مستر احمد الباشا وكل ما يخص الساينس : جروب الفيس بوك http://bit.ly/2Of1mcN صفحة الفيس بوك http://bit.ly/2Gq5xMo بالتوفيق مستر احمد الباشا