chapters 4.1 and 4.2 notes energy
the SI unit for energy is the ______
Joule
example of mechanical energy-
an airplane flying
chemical energy- potential energy stored in _____ ____; any chemical change. (digesting food, lighting a match, leaves changing color)
chemical bonds
examples of kinetic energy- the car is _____ away a leaf ____ off a tree tennis ball ______ a roller coaster ____ down a hill
driven falling rolling moving
electric energy- the energy of ___ _____ (lightning electrical lines batteries)
electric charges
is the ability to do work or cause change. is needed to move things or change matter
energy
friction produces ____
heat
depends on _____- (gravitational potential energy) and _____- (elastic potential energy)
height shape
example of power
if you shovel snow or use a snow blower the same amount of energy is transferred. the snow blower has more power because it transfers the same amount of energy but in less time
if mass increases- kinetic energy _____
increases
once an object begins moving it becomes ____ energy
kinetic
what are the two types of energy?
kinetic potential
energy can neither be created nor destroyed. energy is always changing from one kind to another. the total energy of an object never changes.
law of conservation of energy
an object with ______ energy can do work on another object
mechanical
kinetic energy has to do with energy of an object in ______
motion
thermal energy- the ______ of very small particles which make up matter
motion
work- exerting a force that causes to ____ in the direction of the force.
move
energy is needed to ___ things or _____ matter
move change
what kind of energy had energy stored in the _____ of an atom
nucleus
examples of potential energy- a ____ car a leaf on a tree a tennis ball ______on a table a roller coaster at the ___ of a hill
parked resting top
mechanical energy is a combination of an objects ______ energy and _______ energy or mechanical energy can be an objects kinetic or potential energy _____
potential kinetic only
the rate at which work is done
power
power- the ____ at which work is done
rate
electromagnetic energy- energy that travels through _____ in _____ (microwaves heat waves radio waves)
space waves
factors that affect kinetic energy- _____ and ______
speed mass
potential energy is energy _____ that is waiting to be used
stored
when you do work on an object some of your energy is _______ to that object
transferred
the more the particles move the _____ the temperature of the object. ice to water to steam
warmer
exerting a force that causes something to move in the direction of the force
work
energy is the ability to do ____ or cause _____.
work change