Across
- 4. is a single force that acts on an object as a result of the interaction between the object and its environment
- 5. a visual representation of the forces, moments, and reactions acting on an object in a given situation
- 6. the forces that act between two or more nucleons
- 11. the force that pushes two objects apart
- 12. a force that pulls two objects towards each other
- 13. they result from physical contact between two objects
- 16. steady speed achieved by an object freely falling through a gas or liquid
- 20. an action exerted on an object which may change the object’s state of rest or motion
- 21. the tendency of an object not to accelerate, Newton’s first law
- 23. SI unit of force, named after Sir Isaac Newton
- 24. the force that opposes the movement of two surfaces that are in contact and are sliding over each other
- 26. a metric system of measurement based on the centimeter, gram, and second as the units for length, mass, and time, respectively
- 27. Diagrams that show force vectors as arrows
- 29. a field of force that consists of both electric and magnetic components, resulting from the motion of an electric charge and containing a definite amount of electromagnetic energy.
- 30. a system of weights based on a pound of 16 ounces or 7,000 grains, widely used in English-speaking countries
Down
- 1. a single force whose external effects on a rigid body are the same as the effects of several actual forces acting on the body
- 2. does not involve physical con- tact between two objects.
- 3. a force that acts on a surface in a direction perpendicular to the surface
- 7. the ratio of the magnitude of the force of friction between two objects in contact to the magnitude of the normal force with which the objects press against each other
- 8. refers to the realm of phenomena that are visible to the naked eye
- 9. the individual forces that make up a larger force vector when it is broken down into its constituent parts along specific axes, usually horizontal (x) and vertical (y)
- 10. the region of space surrounding a body in which another body experiences a force of gravitational attraction.
- 14. the total force acting on an object, or the combination of forces and torques acting on a rigid body
- 15. the force that resists the initia- tion of sliding motion between two surfaces that are in contact and at rest
- 17. the state in which the net force on an object is zero
- 18. for every action there is an equal and opposite reaction
- 19. his work contributed much to the modern understanding of force and motion
- 22. a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe
- 25. an electric property associated with each point in space when charge is present in any form
- 28. F = ma, or net force is equal to mass times acceleration