Vocabulary
the ability to do work
energy
The biggest source of light energy
sun
Riding a bike is an example of this kind of energy.
kinetic energy
How can a roller coaster gain potential energy?
Go higher
What 2 forces are acting on a falling pair of underpants that fell off the laundry line?
Air resistance and gravity
The energy of motion
Kinetic energy
If you imagine a drop of water about to fall down a waterfall, at the top of the waterfall the drop of water has this kind of energy.
Potential Energy
this form of energy cooks food in boiling water
thermal/heat energy
a light bulb converts electrical energy into which of the following energy?
light only
heat and light
heat only
light and motion
heat and light
Visible light is an example of what specific type of light energy?
Electromagnetic
______ energy is the only source of energy we can see.
Light Energy
This type of energy is present in a glass of water on a table?
Potential energy
Both of these types of energy produce "waves" and are a part of our bodies' senses. Some examples are your tv, and your phone
Sound & light energy
What energy CHANGE takes place when someone plugs a radio into an electrical outlet?
light energy changes to sound energy
sound energy changes into electrical energy
electrical energy changes into sound energy
chemical energy changes into sound energy
Electrical energy changes into sound energy
Equation for Total Mechanical Energy
T.M.E. = GPE + KE
Units for Energy
the energy that comes from a substance whose molecules are vibrating faster due to a rise in temperature.
heat or thermal energy
You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, how much kinetic energy does it have?
100J
A hair dryer transforms _______energy to _____ ,________, & ________
electrical to mechanical, sound, and heat
Energy stored in a stretched or compressed material
Elastic Potential Energy
The Law of Conservation of Energy states that energy is never created or destroyed, it is only ________ from one form to another.
changed
music coming from the radio, your loud vacuum cleaner, people talking on tv are all examples of this type of energy
sound energy
I have 250J of kinetic energy on a 50kg rollercoaster. What is the coasters velocity?
3.16m/s
Water can be changed to all forms of energy because Energy is what?
Transferred to other forms
What is the #1 reason a feather takes longer than a bowling ball to fall?
Air resistance. When we remove it they fall at the same speed