Forces

3. The piece of equipment used to measure the size of a force.
6. The force of gravity acting on an object's mass.
8. When forces are not equal, causing an object to change speed or direction.
9. A push or a pull or a twist exerted on an object.
12. The non-contact force that pulls objects toward the center of the Earth.
13. The upward force that keeps objects afloat in water.

1. A type of force that acts at a distance (e.g., gravity or magnetism).
2. resistance: A type of friction caused by air particles hitting a moving object (also called drag).
4. The force that opposes motion between two surfaces sliding past each other.
5. The standard unit used to measure force (Symbol: N).
7. When two forces acting on an object are equal in size but opposite in direction; the object stays still or moves at a constant speed.
10. A type of force that requires objects to touch (e.g., friction).
11. The amount of "stuff" or matter in an object, measured in kilograms (kg).