14 terms

Houghton Mifflin Science Grade 4 Chapter 16

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Terms in this set (...)

motion
A change in an objets position as compared to objects around it.
position
An object's location, or place
speed
A measure of the distance an object travels in a certain amount of time.
velocity
A measure of speed in a certain direction.
force
A push or pull.
friction
A force that slows or stops motion between two objects that are touching.
gravity
A force that pulls objects toward each other.
inclined plane
A simple machine made up of a slanted surface.
lever
A simple machine made up of a stiff bar that moves freely around a fixed point.
pulley
A simple machine made up of a rope fitted around the rim of a fixed wheel.
screw
A simple machine made up of an inclined plane wrapped around a column.
simple machine
A device that changes a force.
wedge
A simple machine made up of two inclined planes.
wheel and axle
A simple machine made up of two cylinders that turn on the same axis.
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