Download KE and PE

KE and PE
Name: __________________ Date: _________________ Period: _____
KE= ______________________ (formula)
1. What is the KE of an 800 kg car traveling at a velocity of 25m/s?
2. What is the KE of a 2.5 kg baseball thrown with a velocity of 12 m/s?
3. If a 4 kg rock falls with a velocity of 7 m/s, what is its KE?
PE= ______________________ (formula)
4. What is the PE of a 4 kg picture hanging 2 m high in a wall?
5. What is the PE of a 12 kg TV sitting on a 2 m high bookshelf?
6. If a 2 kg book is placed on a 3m high shelf what is its PE?
Decide which of the examples below describe which type of energy; write the form of energy in the blank.
Either the examples are Potential or Kinetic energy
1. __________________ Battery in a flashlight
2. __________________ Battery making a robot move
3. __________________ Diver standing on a diving board
4. __________________ Automobile parked on a street
5. __________________ Water boiling on a stove
6. __________________ Walking up stairs
7. __________________ Diver making a dive into water
8. __________________ Diver swimming in water
9. __________________ A sports car racing at 120 km/hr
10. __________________ Water in a pot
11. __________________ Wind up toy plane on a shelf
12. __________________ Winding up motor of the toy plane
13. __________________ Pouring water from a pot
14. __________________ A toy plane flying in the air
Types of Energy
Potential energy
Kinetic energy
Potential energy is stored energy and the energy of position. There
Kinetic energy is the motion of waves, electrons, atoms,
are several forms of potential energy.
molecules, substances, and objects.
Chemical energy is energy stored in the bonds
of atoms and molecules. Batteries, biomass,
petroleum, natural gas, and coal are examples of
stored chemical energy. Chemical energy is
converted to thermal energy when we burn wood
in a fireplace or burn gasoline in a car's engine.
Radiant energy is electromagnetic energy that
travels in transverse waves. Radiant energy
includes visible light, x-rays, gamma rays and
radio waves. Light is one type of radiant energy.
Sunshine is radiant energy, which provides the
fuel and warmth that make life on earth possible.
Mechanical energy is energy stored in objects by
tension. Compressed springs and stretched
rubber bands are examples of stored mechanical
energy.
Thermal energy, or heat, is the vibration and
movement of the atoms and molecules within
substances. As an object is heated up, its atoms
and molecules move and collide faster.
Geothermal energy is the thermal energy in the
Nuclear energy is energy stored in the nucleus of earth.
an atom—the energy that holds the nucleus
together. Large amounts of energy can be
Motion energy is energy stored in the movement
released when the nuclei are combined or split
of objects. The faster they move, the more energy
apart. Nuclear power plants split the nuclei of
is stored. It takes energy to get an object moving,
uranium atoms in a process called fission. The
and energy is released when an object slows
sun combines the nuclei of hydrogen atoms in a
down. Wind is an example of motion energy. A
process called fusion.
dramatic example of motion is a car crash, when
the car comes to a total stop and releases all its
Gravitational energy is energy stored in an
motion energy at once in an uncontrolled instant.
object's height. The higher and heavier the object,
the more gravitational energy is stored. When you Sound is the movement of energy through
ride a bicycle down a steep hill and pick up
substances in longitudinal
speed, the gravitational energy is being converted (compression/rarefaction) waves. Sound is
to motion energy. Hydropower is another example produced when a force causes an object or
of gravitational energy, where the dam piles up
substance to vibrate. The energy is transferred
water from a river into a reservoir.
through the substance in a wave. Typically, the
energy in sound is far less than other forms of
energy.
Electrical energy is delivered by tiny charged
particles called electrons, typically moving
through a wire. Lightning is an example of
electrical energy in nature.
Source: U.S. Energy Information Administration (http://www.eia.gov/kids/energy.cfm?page=about_forms_of_energy-basics)