Across
- 6. The SI unit of power is the watt
- 7. the conservation of mechanical energy occurs in the absence of friction, the total mechanical energy remains the same
- 8. the sum of kinetic energy and all forms of potential energy
- 10. the energy associated with an object because of the position, shape, or condition of the object
- 12. For a flexible spring, the spring constant is small, whereas for a stiff spring, the spring constant is large
- 16. the sign of the net work on the object tells you whether the object's speed is increasing or decreasing
- 17. the product of the component of a force along the direction of displacement and the magnitude of the displacement
- 18. gravitational potential energy = mass × free-fall acceleration × height
- 19. initial mechanical energy = final mechanical energy (in the absence of friction)
- 22. the potential energy stored in the gravitational fields of interacting bodies
- 24. SI unit for kinetic energy (and all other forms of energy) is the joule
- 25. a conserved quantity that you are already familiar with is mass
- 27. there are 2 types of potential energy
- 28. the energy available for use when a deformed elastic object returns to its original configuration
- 30. The object’s speed decreases if the net work is negative.
Down
- 1. the net work done by all the forces acting on an object is equal to the change in the object’s kinetic energy
- 2. Work is a _______ quantity and can be positive or negative
- 3. The joule is named for the_____ physicist James Prescott Joule (1818–1889).
- 4. kinetic energy = 1× mass × (speed)2
- 5. the energy of an object that is due to the object’s motion
- 9. Components of the force perpendicular to a displacement do not do work.
- 11. Machines with different power ratings do the same amount of work in different time intervals
- 13. All energy, such as nuclear, chemical, internal, and electrical, that is not mechanical energy is classified as nonmechanical energy.
- 14. The net work done on or by an object is equal to the change in the kinetic energy of the object.
- 15. The energy that each ball has varies in a way that keeps the total energy of the system constant.
- 20. a parameter that is a measure of a spring’s resistance to being compressed or stretched
- 21. gravitational potential energy in this chapter is valid only when the free-fall acceleration is constant over the entire height, such as at any point near the Earth’s surface.
- 23. Work, energy, and power are related to one another
- 26. a quantity that measures the rate at which work is done or energy is transformed
- 29. power = force x speed