PHYS 101 Lecture 26: Chapter 6-3
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We (cid:449)ill reser(cid:448)e the ter(cid:373) (cid:862)ki(cid:374)eti(cid:272) e(cid:374)ergy(cid:863) for (cid:373)otio(cid:374) that is (cid:373)a(cid:272)ros(cid:272)opi(cid:272)ally o(cid:271)ser(cid:448)a(cid:271)le, i. e. for the (cid:373)otio(cid:374) of a(cid:374) o(cid:271)je(cid:272)t as a (cid:449)hole. A(cid:374)d (cid:449)e (cid:449)ill (cid:272)all (cid:862)ther(cid:373)al e(cid:374)ergy(cid:863) the e(cid:374)ergy asso(cid:272)iated (cid:449)ith the microscopic motion of particles within a body. We have described kinetic, elastic (spring) and heat energies in terms of gravitational energy. Easy: if any of these produce heat, then we can replace our stove coil with a different heat source (say a hot chemical reaction), which will in turn move the piston and form gravitational energy. The process i have just described is called an energy conversion: the process by which one type of energy is transformed into another type of energy. Identify the energy conversions in the following processes. What is the gravitational energy at the top? mgh. What is the gravitational energy at the bottom? zero. What is the kinetic energy at the top? zero.
