天文学课件4

Objects in Rotational MotionWhy wheel?2242TLggLT2rGMg Foucault pendulum experiment FRotational Inertia A body at rest tends to remain at rest. A body thats rotating tends to continue rotating.Physical QuantitiesFAngular Position an objects orientation Angular Velocity its change in angular position with time Torque a twist or spinPhysics ConceptWhy?Stabilization VS energy transitionHow?Stabilization VS energy transitionWhy?Why?Why?BicyclesWhy?BicyclesBicyclesL = I In the air, motorcycle riders control their bikes by revving up their motors to spin the rear tire faster, or by putting on the brakes to slow the tire. This changes the angular momentum of their system internally, giving them control of the angle at which they come down.Why?MD 600NK-MAXWhy?Antilock Braking system(ABS)Antilock Braking system(ABS)Antilock Braking system(ABS)2mrF Do you know the altitude of geostationarysatellite (同步卫星)?How does “BeiDou” work?Why we built a new rocket launch base in WenChang, HaiNan?Can we have this feeling on the earth?Any other way?Why the face of moon never change ( not the shape)?Ecliptic (黄道)Why?