Across
- 4. easy
- 6. The person who invented pulleys, gears, and other simple machine
- 7. It has a pulley in it
- 8. the strength and vitality required for sustained physical or mental activity.
Down
- 1. the intellectual and practical activity encompassing the systematic study of the structure and behaviour of the physical and natural world through observation and experiment.
- 2. strength or energy as an attribute of physical action or movement.
- 3. makes a bike move
- 5. A simple machines