Gravitational and frictional force

Hi everyone! I'm back! This week,  we are learning gravitational force and frictional force as you see in the picture. Gravitational force is a force that keeps everything from floating to space.Gravitational force is different from each planet because of its size. All objects have weigh because if the gravitation around us. Frictional force is a opposing motion. it is produced when 2 sides rub. frictional force slows down moving objects. Frictional force also produced when things move trough air and water. they are divided by 2 frictional force : air resistance and water resistance. in both resistance,bigger object gets less resistance. frictional force can also be useful. in our daily live, frictional force gives us grip. without frictional force, we cannot hold anything. But sometimes, frictional force can cause problem. such as making things overheat and wear out. there are ways to overcome frictions. we can reduce friction by the use of lubricants, roller and wheels. but I think I need to end this so, bye!