C165 NASA has used this same idea to "weigh" astronauts during space missions. They developed a device in which the astronaut glides back and forth by being pushed and pulled by springs. The springs apply the same force during each swing. The velocity of the astronaut is constantly changing as the force from the spring accelerates him first one way, then the other. If the astronaut has lost weight while in space, would the spring accelerate him back and forth more easily or less easily?

power out to power in less than 100%

another example of kinetic energy would be,

kinetic energy   >     moving energy

answer   >   letter choice (c),   a hammer falling off a table.

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the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

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im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.