Sources of Energy
What type of energy is used in light bulbs?
Electromagnetic
What is energy?
Energy can be defined as the ability to do work. If an object or organism does work (exerts a force over a distance to move an object) the object or organism uses energy.
Describe a potential to kinetic energy conversion
Roller coasters work because of the energy that is built into the system. Initially, the cars are pulled mechanically up the tallest hill, giving them a great deal of potential energy. From that point, the conversion between potential and kinetic energy powers the cars throughout the entire ride.
What is the unit for energy/work?
Joules
What type of energy is used in the gears of a machine?
Mechanical
What is potential energy?
Potential Energy is stored energy.
Name an energy conversion involving nuclear energy
The sun’s energy through solar cells can be converted directly into electricity.
What is the kinetic energy of a 2,000-kilogram boat moving at 5 m/sec?
25000 Joules
What type of energy is stored inside a battery?
Chemical
What is kinetic energy?
¡Kinetic Energy is the energy of motion.
Describe an energy conversion involving electromagnetic energy.
In an electric motor, electromagnetic energy is converted to mechanical energy.
What is the potential energy of a 3 kilogram-ball that is on the ground?
0 Joules
The friction at the end of the rollercoaster led to what type of energy?
Heat/Thermal
What is gravitational potential energy?
Potential energy that is dependent on height is called gravitational potential energy.
Describe a three step energy conversion.
In an automobile engine, fuel is burned to convert chemical energy into heat energy. The heat energy is then changed into mechanical energy.
What is the mass of an object that creates 33,750 joules of energy by traveling at 30 m/sec?
75 kg
Fusion and fission reactions are which type of energy?
Nuclear
What is the conservation of energy?
Energy can be neither created nor destroyed by ordinary means. It can only be converted from one form to another. If energy seems to disappear, then scientists look for it – leading to many important discoveries.
Plan an experiment to show energy conversions
Roller coaster lab
A cinder block is sitting on a platform 20 m high. It weighs 79 N. The block has potential energy. Calculate it.
1580 Joules