Motion是什么意思？

With a wireless setup, you stick batterypowered sensors up around your home that keep an eye on windows, doors, motion, and more.

So, too, would the motion detectors in your home, so the thief will need to continue jamming once he's inside and searching for things to steal.

Although no form of matter yet discovered moves as fast as or faster than light, scientific experiments have already confirmed that accelerated motion causes a traveler's time to be stretched.

with a wireless setup, you stick battery-powered sensors up around your home that keep an eye on windows, doors, motion, and more.

Unfortunately for them ( ' , and often the taxpayers), our energy systems are a bit like an aircraft carrier: they are unbelievably expensive, they are built to last for a very long time, they have a huge amount of inertia ( ' , meaning it takes a lot of energy to set them moving), and they have a lot of momentum once they are set in motion.

So a heavy object, like a football player moving at a high speed, has a lot of momentum — that is, once be is moving, it is hard to change his state of motion.

Inertia is the resistance of objects to efforts to change their state of motion.

Energy.systems, like an aircraft carrier set in motion, have huge momentum.

So a heavy object, like a football player moving at a high speed, has a lot of momentum — that is, once he is moving, it is hard to change his state of motion.

Unfortunately for them and often the taxpayers, our energy systems are a bit like an aircraft carrier : they are unbelievably expensive, they are built to last for a very long time, they have a huge amount of inertia meaning it takes a lot of energy to se