Kinetic Energy
What does kinetic energy depend on?
Mass and Velocity
What does gravitational energy depend on?
Mass, gravitational acceleration, or height.
Stored energy is known as this.
Potential Energy
What is Energy?
The ability to do work.
What is the difference between weight and mass?
Mass is how much matter makes up an object and weight is the force gravity pulls with.
What is the kinetic energy of a roller coaster that has a mass of 1500 kg and is traveling at 25 m/s?
468750 Joules
How much gravitational potential energy does a bowling ball with a mass of 7.26 kg have when it is suspended from the leaning tower of Pisa (56.6 m)?
4031 Joules
Energy due to the motion of an object
Kinetic Energy
Why is no machine 100% efficient?
Friction will always transform energy into forms of energy such as thermal or acoustic.
If a 2000 kg roller coaster starts at a height of 20 m, how much Kinetic Energy does the roller coaster have at the bottom of its decent? (diagram on board)
392000 J
If you have 500 Joules of kinetic energy when traveling at 5 m/s, how many Joules of kinetic energy would you have traveling at 10 m/s?
2000 Joules
A water balloon travels at 5 m/s when dropped from a height of 1.25m. How high must you drop the balloon to give it a speed of 10 m/s?
5 meters
Thermal Energy
What is the conservation of energy?
Energy cannot be created or destroyed, just transformed.
According to the diagram on the board, how much work is done on the roller coaster from Point A to Point B?
392000
A 2000 kg jet has 8,100,000 Joules of kinetic energy while in flight. How fast is the jet flying?
90 m/s
How high must a ramp be in order for a 70 kg person to have a kinetic energy of 13734 J?
20 meters
Energy of mechanical waves that move through a medium such as air.
Acoustic Energy
What is the relationship between work and energy?
When Work is done on or by a system, the change in energy of the system is equal to the quantity of work done.
According to the diagram on the board, how much kinetic energy did the roller coaster have half way between Point A and Point B?
196000
According to the diagram on the front board, how fast is the roller coaster traveling at point C if the loop is 10 m high?
14 m/s
A 65 kg skate boarder starts on a ramp that is 10 m high, but after going down and then up the ramp on the other side she only reaches a height of 7 meters. How much energy was lost to friction?
1913 Joules
Energy of electromagnetic waves.
Radiant energy
If you gave a book 200 Joules of potential energy by lifting it 2 meters into the air, how much work would gravity do on it to bring it back down and what is the mass of the book?
Gravity does 200 J of work and the book has a mass of 10.2 Kg.
According to the diagram on the board, how fast is the roller coaster traveling at point B?
19.8 m/s