Gravity, the shape of the Earth, isostasy, moment of inertia . Gravity is one of the four fundamental forces (the others are the electromagnetic, the weak force and the strong force) and probably the least well understood. The basic concepts were formulated by Newton i n the 17th century. These were deductions from Kepler âs Laws of planetary motion.
Muscular endurance is an associated component of physical fitness. It has a lot of significance in sports as well as for general health. Muscular endurance is the ability of a muscle or a group of muscles to undergo repeated contractions against resistance for an extended period of time.It is associated with the muscle's ability to continue to perform without fatigue.here are two types of muscle fibers-slow twitch and fast twitch. Fast twitch fibers enable swift, short movements that last no longer than a few seconds. Slow twitch muscle fibers enable the performance of tedious, repetitive actions, such as climbing, rowing, running a marathon, etc.
Muscular strength and muscular endurance are not the same, although they are often mentioned together. Strength refers to maximum power and does not require oxygen, while endurance is strength over a prolonged period and does require oxygen. Muscular strength is the ability of the muscles to lift weight. Muscular endurance is the ability to sustain exertion for a specified period of time. Muscular endurance is an aerobic mechanism, meaning that it requires oxygen. Muscular strength is an anaerobic mechanism, meaning that it does not require oxygen as an energy source.