Across
- 3. An elevator is a...
- 6. When were levers invented?
- 7. A teeter-totter is a...
- 11. What is the ratio of output of force to input of force in a system?
- 12. A knife is a...
- 13. A machine that makes things easier.
- 14. What simple machine does a car use?
Down
- 1. What type of simple machine is a ramp?
- 2. What is it called when a machine has more than one simple machine?
- 4. what was the first simple machine?
- 5. Who invented the simple machine?
- 8. how many types of levers are their?
- 9. What type of simple machine can be used by a screwdriver?
- 10. How many simple machines are there?