Across
- 4. A tool with moving parts that makes work easier to do
- 5. The very first test model of a new invention
- 7. A drawing or plan you make before you build something
- 10. A bar that tilts on a point to help lift heavy things, like a seesaw
- 13. A person who designs and builds machines, structures, or systems
- 14. A push or a pull on an object
Down
- 1. The resistance you feel when you rub two things together
- 2. A machine that can be programmed to do tasks all by itself
- 3. Round objects that help cars and machines roll smoothly
- 6. The strongest shape used by engineers to build sturdy bridges
- 8. A wheel with teeth that connects with others to make things turn
- 9. A wheel with a rope around it, used to pull heavy things up high
- 11. The part of a machine that gives power to cars and airplanes
- 12. The power needed to make machines work and move