Definitions
force
a push or pull
3 invisible forces
friction, gravity, magnetism
The watermill generated electricity for the small barn.
water
sound
these make work easier
simple machines
motion
a change of position
magnetism
the pushing or pulling force of a magnet
The giraffe ate a leaf from the tallest tree.
animal
riding a tricycle
mechanical
this can change from one form to another
energy
weight
the measure of the force of gravity on an object
(WEIGHT IS NOT A FORCE)
friction
a force that slows or stops motion
The children checked out books to read from the library.
people
burning fuels or food
chemical
3 ways to describe motion
the direction, distance, or speed an object travels
work
occurs when a force moves something
gravity
a force that pulls objects toward the center of the earth
A bulldozer pushed a pile of rocks during construction.
machine
battery in a toy
stored
friction and gravity
energy
what is needed to cause change or to do work
what causes an object to move
force
The cherry blossom petals blew across the lake.
wind
DAILY DOUBLE
photosynthesis vs. light bulb
photosynthesis: light
light bulb: electrical
surfaces with less friction compared to surfaces with more friction
ice vs. grass
dress shoes vs. snow boots
hardwood vs. carpet