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Physics General Question When acceleration = gravitational acceleration of 9.8, when finding the value of Fnet, is the 9.8 only used when there is only

Physics General Question

When acceleration = gravitational acceleration of 9.8, when finding the value of Fnet, is the 9.8 only used when there is only a gravitational force acting on the object? If no, why can 9.8 be used in certain situations and in others no. For example, pushing a crate to the right on a surface that has friction, you would not be able to use a = 9.8 why is that?

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