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Increase the kinetic energy of the object. Similarly, if you  decelerate the object  to a lesser speed by applying a force, you decrease the kinetic  energy of the object. We account for these changes in kinetic energy by saying that your force has transferred energy the object from yourself or from the object to yourself.

The term transfer can be misleading. It does not mean that anything material
flows into or out of the object; that is. the transfer is not like a flow of water. Rather  is like the electronic transfer of money between two bank accounts: The number in one account goes up while the number in the other account goes down with .nothing material passing between the two accounts.

To avoid confusion in this chapter. we shall use the symbol W only for work
and shall represent a weight with its equivalent mg.

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