Machines
A device that makes work easier
force
a change in position
motion
the attracting force between two objects
gravity
Has a magnetic field because of its polarity
magnet
helps overcome friction because of its rolling action
hint: car
Wheel and axle
movement resulting from force
work
a force that works against motion along a surface
friction
weight
Acts like a giant electromagnet
gives you a slope on which to push upward
inclined plane
a greater force that overcomes opposing forces, resulting in work
unbalanced forces
discovered the laws of motion
Sir Isaac Newton
Where the pull of gravity is the strongest
Why does the sun have more gravity than the earth?
It has more mass
holds and balances weight so when you push one side of the lever, the other side can lift a load more easily
fulcrum
a force that can attract (pull) and repel (push)
magnetism
a property of matter that makes it resist a change in motion
inertia
Objects with more ____ have more gravity
mass
What part of a building gives it its shape?
the frame
a wheel turns around a cord, used to pull heavy things
pulley
two opposite sides that work differently
polarity
An object in motion will ___ __ _____, unless acted upon by an unbalanced force.
An object at rest will ___ _______, unless acted upon by an unbalanced force.
stay in motion; stay resting
the shape that is more stable than any other shape
upright pyramid
Give an example of a structure used in buildings and bridges that gives them more strength
-arch
-dome
-column
-pyramid or triangular design