Conversions
Convert 100 cm to m
1 m
Fill in the blank: During an energy transformation t he type of energy _________ (changes or stays the same).
Changes
What are the two categories of energy?
Kinetic and Potential Energy
h= 100 m
m= 10 kg
Solve for PE
PE = 9800 J
What is the unit of mass we use when solving for energy?
kilograms
A meteorite weighing 3.5 kilograms lands on Earth. Express its mass in grams.
3500 grams
Identify if it is an energy transfer or transformation: A charger plugged into the wall to charge my computer.
Transfer
What is energy stored due to position or shape.
Potential Energy
m = 25 kg
v = 10 m/s
Solve for KE
KE = 1250 J
What is the unit for velocity we use when solving for energy?
m/s
An engineer is working on a nanotech device that is 750 nanometers wide. What is its width in millimeters?
0.00075 mm
Is this energy transfer or transformation: A wind turbine generating electricity.
Transformation
What is the unit for Energy?
Joules (J)
Amanda climbs to the top of the tree in her backyard. If she weighs 64.3 kg and the tree has a height of 14 m. How much energy does Amanda have?
PE = 8822 J
A roller coaster car is moving at a speed of 20 m/s. The kinetic energy of the car is 100,000 J. Solve for the mass (m) of the car.
m = 500 kg
A bacteria is 0.002 millimeters long. Express its length in micrometers.
2 micrometers
What type of energy is present in this scenario: A battery powering a toy car? Identify the energy it starts with and the energy it ends with.
Electrical energy transforms to Mechanical energy
What does Potential Energy depend on?
Height and Mass
Amanda decides to go roller blading around the neighborhood. If she weighs 64.3 kg and is going at a speed of 12.6 m/s, how much energy does Amanda have?
KE = 5104 J
A 150 g ball is thrown straight up into the air. At its highest point, it has a potential energy of 29.4 J.
h = 20 m
Mia can swim at a speed of 1.67 m/s. What is Mia's spped in mm/s?
1670 mm/s
What type of energy is present in this scenario: A campfire warming your hands? Identify the energy it starts with and the energy it ends with
Chemical energy transforms to thermal energy
Explain why potential energy transforms to kinetic energy when a car rolls down a hill. You must use a specific law in your explanation.
Energy cannot be created or destroyed according to the Law of Conservation of Energy. The Potential energy of the car is transforming into Kinetic Energy as the car picks up speed.
Amanda goes up in a hot air ballon with her family. If she is 15,000 mm in the air and the balloon with her family in it weighs 140,000 g. How much energy do they have?
PE = 20,580 J
A cyclist is riding at a constant speed. Their kinetic energy is .450 kJ, and their mass is 70,000 g. Calculate the cyclist's speed.
v = 3.6 m/s