Vocabulary
the ability to do work
energy
a ball weighs 5 kg and is on top of a 7 m hill. How much potential energy does it have?
343 J
Riding a bike is an example of this kind of energy.
kinetic energy or mechanical energy
Energy can not be lost or destroyed, only _______ into a different form of energy
changed/converted
the energy that comes from a substance whose molecules are vibrating faster due to a rise in temperature.
heat or thermal energy
The energy of motion
mechanical 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 two energies?
heat and light
All types of energy fall into one of these two categories of energy
Potential and Kinetic Energy
What is the Ohm's Law formula?
V = I x R
29.4 J
This is the energy of motion.
kinetic energy
how is a rube goldberg machine different from a simple machine?
simple machines are simple, whereas rube goldberg machines are made of many different simple machines. I.e. complex or compound machines.
what are 3 of the 6 types of simple machines?
lever, pulley, wedge, inclined plane, screw, wheel and axle.
What is specific heat?
the amount of energy needed to raise 1 g of a substance by 1 degree celsius
Also, how fast something heats up or cools down
What energy CHANGE takes place when someone plugs a radio into an electrical outlet?
Electrical energy changes into sound energy
describe the three forms of heat transfer.
Conduction, convection, radiation
A hair dryer transforms _______energy to _____ ,________, & ________
electrical to mechanical, sound, and heat
Heat will ALWAYS flow from _____ to _____
hot to cold
How are Series and Parallel circuits different?
series circuits only have 1 path for energy to travel whereas parallel circuits have more than one path for energy to travel.
identify the amount of energy absorbed in a 200 g sample of water with a specific heat of 4.18 when it is raised from 22 degrees celsius to 44 degrees celsius.
18,392 J
Endothermic reactions absorb heat whereas exothermic reactions release heat.
Endothermic and exothermic reactions both deal with chemical reactions/the breaking of chemical bonds.
describe why an ice cube in the palm of your hand melts over time.
the ice cube is colder than your hand which results in heat moving from the hotter object to the colder object.
determine the amount of energy a ball rolling down a hill has when it has a mass of 5 kg and a velocity of 10 m/s.
250 J