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Although friction is not a conservative force, if we make the friction force an internal force, we can still treat the effects of friction as causing a change in the system's energy, rather than as a work term. Whenever friction is an internal force, we say that it causes a change in the thermal energy of the system. For the situation of the block sliding across the floor described above, what is the change in the thermal energy of the block-floor system? +1 J −1 J It could be either +1 J or −1 J; we don't have enough information to determine which.

Although friction is not a conservative force, if we make the friction force an internal force, we can still treat the effects of friction as causing a change in the system's energy, rather than as a work term. Whenever friction is an internal force, we say that it causes a change in the thermal energy of the system. For the situation of the block sliding across the floor described above, what is the change in the thermal energy of the block-floor system? +1 J −1 J It could be either +1 J or −1 J; we don't have enough information to determine which.

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Although friction is not a conservative force, if we make the friction force an internal force, we can still treat the effects of friction as causing a change in the system's energy, rather than as a work term. Whenever friction is an internal force, we say that it causes a change in the thermal energy of the system. For the situation of the block sliding across the floor described above, what is the change in the thermal energy of the block-floor system? + 1 J − 1 J It could be either + 1 J or − 1 J ; we don't have enough information to determine which.

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