1. Work and Energy
Work

2. Work is done on an object when a force causes a displacement of the object. Work is done only when components of a force are parallel to a displacement.

3. WORK The product of the component of a force along the direction of displacement and the magnitude of the displacement.

6. How much work is done on a vacuum cleaner pulled 3
How much work is done on a vacuum cleaner pulled 3.0 m by a force of 50.0 N at an angle of 30.0° above the horizontal.

7. A tugboat pulls a ship with a constant net horizontal force of 5
A tugboat pulls a ship with a constant net horizontal force of 5.00 × 103 N and causes the ship to move through a harbor. How much work is done on the ship if it moves a distance of 3.00 km?

8. Work is positive when the component of force is in the same direction as the displacement.

12. Kinetic energy is energy associated with an object in motion
Kinetic energy is energy associated with an object in motion. The quantity 1 2 mv2 has a special name in physics: kinetic energy.

13. Kinetic energy is a scalar quantity, and the SI unit for kinetic energy(and all other forms of energy) is the joule. 

14. A 7. 00 kg bowling ball moves at 3. 00 m/s. How fast must a 2
A 7.00 kg bowling ball moves at 3.00 m/s. How fast must a 2.45 g table-tennis ball move in order to have the same kinetic energy as the bowling ball? Is this speed reasonable for a table-tennis ball in play?

16. The net work done on a body equals its change in kinetic energy.

17. The work–kinetic energy theorem allows us to think of kinetic energy as the work that an object can do while the object changes speed or as the amount of energy stored in the motion of an object.

18. On a frozen pond, a person kicks a 10
On a frozen pond, a person kicks a 10.0 kg sled, giving it an initial speed of 2.2 m/s. How far does the sled move if the coefficient of kinetic friction between the sled and the ice is 0.10?

21. Potential energy is stored energy
Potential energy is stored energy. Potential energy is associated with an object that has the potential to move because of its position relative to some other location. Gravitational potential energy depends on height from a zero level.

23. Elastic potential energy depends on distance compressed or stretched
Elastic potential energy depends on distance compressed or stretched. elastic potential energy the energy available for use when a deformed elastic object returns to its original configuration

24. spring constant a parameter that is a measure of a spring’s resistance to being compressed or stretched. The symbol k is called the spring constant, or force constant.

26. A 70.0 kg stuntman is attached to a bungee cord with an unstretched length of 15.0 m. He jumps off a bridge spanning a river from a height of 50.0 m. When he finally stops, the cord has a stretched length of m. Treat the stuntman as a point mass, and disregard the weight of the bungee cord. Assuming the spring constant of the bungee cord is N/m, what is the total potential energy relative to the water when the man stops falling?