In a judo foot-sweepmove, you sweep your opponent’sleft foot out from under him whilepulling on his gi (uniform) towardthat side. As a result, your opponentrotates around his right footand onto the mat. Figure 10-44shows a simplified diagram ofyour opponent as you face him,with his left foot swept out. Therotational axis is through point O.The gravitational force on himeffectively acts at his center ofmass, which is a horizontal distanced = 28 cm from point O.Hismass is 70 kg, and his rotational inertiaabout point O is 65 kg m2.What is the magnitude of his initialangular acceleration about point O if your pull on his gi is (a) negligibleand (b) horizontal with a magnitude of 300 N and applied atheight h = 1.4 m?
Gravitational force
In nature, every object is attracted by every other object. This phenomenon is called gravity. The force associated with gravity is called gravitational force. The gravitational force is the weakest force that exists in nature. The gravitational force is always attractive.
Acceleration Due to Gravity
In fundamental physics, gravity or gravitational force is the universal attractive force acting between all the matters that exist or exhibit. It is the weakest known force. Therefore no internal changes in an object occurs due to this force. On the other hand, it has control over the trajectories of bodies in the solar system and in the universe due to its vast scope and universal action. The free fall of objects on Earth and the motions of celestial bodies, according to Newton, are both determined by the same force. It was Newton who put forward that the moon is held by a strong attractive force exerted by the Earth which makes it revolve in a straight line. He was sure that this force is similar to the downward force which Earth exerts on all the objects on it.
In a judo foot-sweep
move, you sweep your opponent’s
left foot out from under him while
pulling on his gi (uniform) toward
that side. As a result, your opponent
rotates around his right foot
and onto the mat. Figure 10-44
shows a simplified diagram of
your opponent as you face him,
with his left foot swept out. The
rotational axis is through point O.
The gravitational force on him
effectively acts at his center of
mass, which is a horizontal distance
d = 28 cm from point O.His
mass is 70 kg, and his rotational inertia
about point O is 65 kg
m2.What is the magnitude of his initial
angular acceleration about point O if your pull on his gi is (a) negligible
and (b) horizontal with a magnitude of 300 N and applied at
height h = 1.4 m?
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