Simple Machines

4. 'Rolls' to reduce friction
8. He came up with three laws of motion
10. A machine made of two wedges on levers (used to cut things)
13. The force pulling us down due to the mass of the Earth
14. More commonly known as a ramp
15. Strong shape with circular cross section
17. Most simple machines decrease the force by increasing the _________ travelled
18. Two inclined planed back to back

1. By pulling rope through these we can decrease the force needed for a job
2. Strong shape used in roof trusses and bridges
3. For every force there is an equal but _______ force
5. The tendency of an object to 'keep doing what its doing'
6. How quickly an object changes velocity (speed)
7. This equals mass x acceleration (F=ma)
9. Changes the direction of a force
11. An inclined plane wrapped around an axle
12. An object will keep doing what its doing unless acted on by an _________ force
16. A long handle allowing force to be applied at a distance