Types of Energy
Energy stored in food
Chemical potential energy
A car with a mass of 1500 kg is moving at a speed of 14 m/s. What is the kinetic energy of the car?
What is 1.5 x 105 J?
What is the value of the acceleration due to gravity (g) that is used in potential energy calculations?
9.81 m/s2
What is the energy transformation happening in a ceiling fan?
Electrical kinetic to Mechanical kinetic
A kerosene lantern uses 984 J of chemical potential energy and produces 75 J of light energy. How efficient is the lantern in transforming chemical potential energy into light?
What is 7.6%
What is Thermal Energy?
Energy of random motion of particles
The amount of kinetic energy that an object contains depends upon two things: mass and ________.
What is velocity?
A large cat of 5.00 kg is lifted 10 m above the ground, what is its potential energy?
What is 4.9 X 102 J
Energy transformation in a green plant in a sunny day.
Light energy to Chemical energy
What is the law that states energy is neither created or destroyed
Law of conservation of energy
Energy stored by separation of positive and negative charges
Electrical potential energy
A freight elevator with a mass of 120 kg has 375 J of kinetic energy, what is its velocity ?
2.50 m/s
A piano is raised up 15 m by a crane and has 4500 J of potential energy. What is its mass?
31 kg
What is energy transformation occurring in a campfire?
Chemical energy to Light/Thermal energy
When energy transformation occurs, some of energy is converted into a form that is not useful.
ie. In a light bulb, this is ____ energy.
Thermal (heat)
Energy of ultraviolet radiation (UV)
Radiant Energy
In the kinetic energy and gravitational potential energy formulas what unit is mass measured in?
kilograms (kg)
Two boxes of equal mass are falling from a building to the ground. Box A is falling from the 5th floor and Box B is falling from the 3rd floor. Which Box has the most potential energy?
What is Box A?
What energy transformation occur in a battery in a closed circuit?
Chemical potential energy to Electrical potential energy
________ Energy = Kinetic Energy + Potential Energy
Total
Energy of a stretched rubber band.
Elastic potential energy
A 6200 kg elephant charge at kinetic energy of
310 000 J, what is its velocity?
10 m/s
A statue of 20 kg is lifted up with a 800 J of Potential energy, how high was it lifted?
4.1 m
What is Energy Transformation?
Energy change from one form to another.
A system where energy and matter cannot be exchanged.
Isolated system