6. describe what is meant by conservation of momentum. 7. be able to relate different practical examples of torque. 8. be able to analyze different situations and determine which forces are acting on it. He is in control of his creation, and that creation obeys His laws. An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an outside force.
Friction slows down a moving object because it is a force against motion.
Three types of Friction. Rolling Friction - when an object rolls over a surface. Generally it takes less force to overcome rolling friction than sliding friction. Friction is necessary - Imagine trying to walk or drive a car without friction. It would be impossible to start moving without something to push off of, and once you were moving it would be impossible to stop.