I Like to Move It, Move It
The energy of motion
What is kinetic energy?
Gravitational potential energy is directly related to these 3 variables
What are mass, gravity, and height?
Sunlight is classified as this form of energy
What is radiant or electromagnetic?
When using a toaster, this energy transformation takes place
What is electrical energy changes to thermal energy?
A 4 kilogram cat is resting on a bookshelf that is 2 meters high. The cat's gravitational potential energy relative to the floor is...
80 J
As a pendulum swings back and forth, the pendulum has the MOST kinetic energy in this location
What is at the lowest part of its swing?
As a pendulum swings back and forth, the pendulum has the MOST potential energy in this location
What is at the end points (highest points) of its swing?
This form of energy increases when an object becomes warmer
What is thermal energy?
Nuclear power plants are designed to convert nuclear energy into this type of energy
What is electrical?
A small 30 kilogram canoe is floating downriver at a speed of 2 m/s. The canoe's kinetic energy is...
60 J
A ball that bounces will reach lower heights after each bounce due to this energy change
What is friction/air resistance converts some mechanical energy to thermal energy?
A skier is on the top of a slope and has 300 J of potential energy. What is the potential energy of skier two thirds of the way down the slope?
100 J
This form of energy is stored in gasoline
What is chemical energy?
When walking, this type of energy is converted to mechanical energy.
What is chemical energy?
An arrow in a bow has 70 J of potential energy. Assuming no loss of energy to heat, how much kinetic energy will it have after it has been shot?
70 J
When the MASS of an object is doubled, the kinetic energy of the object will do this
What is double?
A cyclist is coasting down a hill. At the top of the hill, the cyclist has a potential energy of 1000 J. What is the cyclist's kinetic energy half-way down the hill?
500 J
This form of energy is the SUM of potential energy and kinetic energy
What is mechanical energy?
A diver is diving into a pool. Describe the energy transformation that occurs as the diver travels from the diving board to the water surface.
Consider: PE is converted to KE energy. The total mechanical energy stays the same.
A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2 kg dog need to jump this high?
86.4 J
When the VELOCITY of an object is doubled, the kinetic energy of the object will do this
Provide 3 examples of an object with elastic potential energy.
Answers may vary. Consider: a wind-up toy that has been wound up, a stretched rubber band, a compressed basketball
This law states that (1) energy cannot be created, (2) energy cannot be destroyed, and (3) energy can be converted from one form to another.
What is the law of conservation of energy?
Describe the energy transformations that occur in a hydropower plant (like the Hoover Dam)
Mechanical (water) --> Mechanical (turbine) --> Electrical (electricity)
A 5 kg ball is dropped from a height of 24 m. How fast is the ball moving when it is 4 m from the ground?
20 m/s