Unit 2: Forces at Work

4. The forces act in opposite directions.
5. The size of something.
9. An external push or pull on an object exerted by another object.
10. A force that slows objects down as they move.
14. Measure tools to define the objects or liquids mass.
15. The amount of unbalanced force acting on an object.
18. The action or process of moving or being moved.
19. Equal forces acting on an object in opposite directions, which results in no change to the object's motion.
21. An excess amount of force that doesn’t get canceled.

1. Balanced forces cause an object to remain still.
2. Simultaneous force pairs are equal in strength and opposite in direction.
3. Action-reaction pairs, two forces that are equal in strength, opposite in direction and always occur together when two objects interact.
6. Direction from top to bottom.
7. A force that attracts all objects toward each other.
8. The force created by magnets.
10. A push or pull that can change an object's motion, such as its speed, direction, or shape.
11. The force required to accelerate
12. push or pull that's parallel, which causes a side-to-side motion.
13. The mutual action or influence between two or more forces.
16. Unbalanced forces cause an object to speed up, slow down, or change direction.
17. A push or a pull acting on an object caused by an interaction with another object.
20. The force exerted by a surface on an object in contact with it, acting perpendicularly to the surface.