Homework Answers
1) As arms, legs, torso or head move,
- centre of gravity can change, as it depends on the mass distribution
- rotational kinetic energy can change, as angular velocity may change as a result of law conservation of angular momentum
- Total kinetic energy can change, as angular velocity may change as a result of law of conservation of angular momentum
- moment of inertia can change, as it depends on mass distribution about the axis.
2) Considering gravitational potential energy (Ug)
- Ug is always negative. (It is
- Ug is always calculated in reference to a chosen zero.
- Ug has the same units as kinetic energy. (Since both are energy).
- Ug can be changed by work done on the system.
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