1. Work = ………………x……………………….

2. ……………….energy is obtained from loudspeakers, while ………….is obtained from solar cells.

3. The energy produced from burning of wood is …………energy, while energy stored in a stretched spring is
……………… energy.

4. The factors that affect potential energy are …………….. and …………….

5. Mass is determined by…………unit, while the weight is determined by …………..unit.​