Motion & Machines

3. force that works against the effort
7. a grooved wheel with a chain or rope wrapped in the groove
9. flat, slanted surface
11. the spot where a bar turns or pivots on a lever
13. determined by dividing the distance an object travels by the time it takes the object to travel that distance
16. an object that makes work easier by strengthening the force used to do the work or changing the direction of the applied force
17. force that resists the movement of objects against each other
18. the change of an object's position
19. the pull of one object on another
21. Newton's ___ law of motion states that force is equal to an object's mass and the acceleration of an object
23. Newton's ___ law of motion, sometimes called "the law of action and reaction," says that when one object exerts a force on a second object, the second object reacts by exerting an equal force back on the first object
24. inclined plane wound around a cylinder or cone
25. consists of a wheel and rod, or axle, running through the wheel
27. distance an object moves over a given amount of time

1. Newton's ___ law of motion says that an object tends to stay at the same velocity unless force causes it to change
2. the ability to make something move
4. decrease in effort that is needed to move an object
5. resistance to a change in motion
6. two inclined planes placed back-to-back
8. change in velocity during a period of time
10. the mass and velocity of an object determine its ___
12. any bar that turns on a point
14. unit in which force is measured
15. combines multiple fixed and moveable pulleys
20. fixed/unmoving object or location
22. unit used to measure work
26. a push or a pull