Content Vocabulary for Forces & Motion 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. acceleration: a change in speed or direction of an object balanced forces: forces that are equal in size but opposite in direction complex or compound machine: a machine made of two or more simple machines energy: the ability to do work force: the amount of push or pull on an object friction: force that makes an object slow down or stop fulcrum: the pivot point for a lever gravity: force that pulls an object towards the center of the earth inclined plane: any slanted surface inertia: force that keeps a still object still or keeps a moving object moving lever: simple machine that made of a stiff bar that rests on a support load: how heavy the amount of work is kinetic energy: energy being used at a particular time magnetism: the force of pushing or pulling between magnet poles momentum: the measure of how hard it is to slow down or stop an object motion: is what happens when an object changes its’ position net force: two or more forces acting together on an object position: the place of an object potential energy: stored up energy that isn’t being used yet power: amount of work done during specific amount of time pulley: a simple machine that uses a wheel and a rope to raise and lower an object screw: an inclined plane that is wrapped around a pole speed: the measure of how fast an object moves unbalanced forces: when one force is greater than the other force, causing the weaker one to move velocity: the speed of an object wedge: simple machine that has a slanted side and ends in a sharp edge wheel and axle: simple machine made of a wheel with a rod through the center to move the load work: the use of force to move an object