Kinetic or Potential?
This type of energy is present when a ball rolls down a hill.
What is kinetic Energy?
Define the Law of Conservation of Energy.
Energy cannot be created nor destroyed, it can only change forms.
Write the formula to calculate PE, and identify each variable present in the formula.
PE = m * g * h
m = mass (kg)
g = 9.81 m/s2
h = height (m)
Identify the flow of energy in an electric toaster
electrical energy --> thermal energy
Calculate the energy of a 81 kg line worker fixing power lines that are 36 m off the ground.
28,605.96 J
This type of energy is present when a ball is sitting at the top of a hill.
What is potential energy?
This is the amount of kinetic energy present in a pendulum when the potential energy of the bob before moving is 300 J.
What is 300 J?
How many J of energy are present when a 528 kg car is traveling at 43 m/s?
488,136 J
Identify the transformation of energy in a wind turbine.
mechanical (kinetic) --> electrical energy
Calculate the energy of a 0.26 kg tennis ball that has a velocity of 9.7 m/s.
12.2317 J
This equation is used to calculate kinetic energy.
When a ball is sitting at the top of a hill, it has a potential energy of 35,294 J of energy. How much kinetic energy could the ball have?
35,294 J of kinetic energy
How many J of energy are present in a 12 kg boulder sitting on a hill that is 64 m off the ground?
7,526.4 J
Identify the energy transformation present in a battery powered flashlight.
chemical --> electrical --> electromagnetic (light)
What will happen to the value of kinetic energy if the mass is doubled?
KE will increase by 2x
This type of energy is present when a 500 kg roller coaster cart is launched from the top of a hill and speeds down the first hill with a velocity of 63 m/s.
What is kinetic energy?
For an electric oven, 11,234 J of energy are used to heat food in an oven, how many joules of energy could be converted into thermal energy?
11,234 J of thermal energy
A 58 kg roller coaster cart has a potential energy of 62,466 J. The cart moves down the first hill at a speed of 40 m/s. What is the kinetic energy at this point?
46,400 J
Identify the energy transformation present when an incandescent lightbulb is lit (hint: three energy types).
electrical --> thermal --> electromagnetic (light)
What will happen to the value of kinetic energy if the velocity is doubled?
KE will increase by 4x
The type of energy stored in chemical bonds is called chemical energy, which is a subcategory of this type of energy.
What is potential energy?
A pendulum is calculated to have 134 J of potential energy and 208 J of kinetic energy. How many J of energy should the pendulum have at every point of its swing?
342 J of energy
A 45 kg person is standing on a mound of dirt that is 13 m off the ground. The person rolls down the mound at a velocity of 2 m/s. Calculate BOTH KE and PE. Assume no thermal energy is lost.
KE = 90 J
PE = 5,738.85 J
Identify the energy transformation present when you charge your phone at night and receive a text message (ringer on)
electrical --> sound and electromagnetic (light)
KE = 7,918.64 J
PE = 17,177.31 J