Vocab
Energy
The ability to cause change
Renamed to Joules
Radiant
light, solar
chemical
from breaking chemical bonds
Determine the energy conversion for the following:
Light Bulb, Firework, Flute, Leaf
Light bulb- electrical to thermal
Firework-Chemical to kinetic, thermal, sound, radiant
Flute-Kinetic to sound
Leaf-Radiant to chemical
How much potential energy does a bird have that weighs 9 N and is sitting on a branch 3 m high?
27 J
Kinetic energy
Energy found in motion
Thermal
heat from fire, sun, friction, electricity.
nuclear
from breaking atomic bonds
List the type of potential energy each object below has.
A. Sandwich
B. Trampoline
A. Chemical potential energy
B. Elastic potential energy
What is the mass of a picture that falls off a shelf 6 m high and has 150 J of energy?
2.55 kg
Potential energy
-Energy stored in position(NO MOTION!)
3 types of potential energy
Gravitational - energy stored in objects that could fall
Chemical- energy stored in chemical bonds
Elastic- energy stored in stretched or compressed objects
Electrical
power outlets, generator, lightning
electromagnetic
energy in the form of electric/magnetic waves that travel through space.
A small child weighs 25 N. If they do a somersault and move a distance of 3 m, how much work was done?
75 J
What is the mass of a ball that is rolling with a speed of 26 m/s and has 1,200 J of energy?
3.55 kg
Law of conservation of energy
energy can never be created or destroyed, only changed into other forms of energy.
sound
vibrations
Where would you find these types of energy:radiant, thermal, electrical, sound, nuclear, chemical, elastic, and electromagnetic.
radiant-fireworks
thermal-fire
electrical- phone charger
sound-music
nuclear- the sun
chemical-gasoline
elastic-trampoline
electromagnetic-radio waves
How far did you push a 12 kg barrel of tools if you did 276 J of work and pushed at a rate of 3 m/s2?
7.67 m
A 0.9 kg pineapple falls from a tree that is 5.8 m tall. How much energy does the pineapple have?
51.16 J
Mechanical energy
The sum of KE and PE in a system as they transform into one another according to the law of conservation.
elastic
stretched/compressed
What is the relationship between kinetic and potential energy of a falling object.
As the kinetic energy of the falling object increases, it results in the decrease of the potential energy.
How much energy does a 4 kg apple have that is thrown at a speed of 2 m/s?
8 J
You move a cart of pumpkins 15 m. This requires a force of 65 N. How much work was done while moving the pumpkin?
975 J