Across
- 2. a rigid bar used to move a heavy or fixed load
- 5. a rod passing through the center of a wheel
- 8. set of toothed wheels that work together to alter speed
- 9. scientist who discovered the laws of gravity
- 10. resistance that an object encounters when moving over a surface
- 11. force that attracts a body towards the center of the Earth
- 12. a wheel with a grooved rim around which a cord passes
Down
- 1. unit of measurement for energy
- 3. an inclined plane
- 4. a piece of wood or metal with a thin edge used to split something in two pieces
- 6. short pin with ridges used to hold something in place
- 7. the speed of something in a given direction
- 10. an influence that changes the direction of motion