Monday, February 8, 2010

True or False: Work is the transfer of energy...?

If false, what do I change work to?True or False: Work is the transfer of energy...?
work = the amount of energy transfered x force





work = force x distanceTrue or False: Work is the transfer of energy...?
Kind of. Work requires movement. The energy used to move a block from point A to point B is work. The energy used to hold a book up in the air and prevent it from falling is not work because the book has not moved. Work is equal to the change in kinetic energy. When the book does not move, the change in kinetic energy is zero, so zero work. When you move a block from point A to point B you applied a force and changed the kinetic energy of the block to something greater than zero, so the work was greater than zero. In the simplest of terms, Work = Net Force x Distance.
Energy makes things work.


I think true.


When a body is lifted. It has potential energy and it is not doing any work until it is released. Now potential energy is transferred to kinetic energy.


Generally work is the product of force and the distance through it moves.


W=F/d


Work is not done until both these factors meet. Suppose force is exerted but it is not moving then it is not doing any work. Its example is standing or staying or sitting what you say.


During this you have potential energy. The force of gravity acts on you but you don't move. The work is not done.

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