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17 terms

Force and Motion Science Unit

STUDY
PLAY
direction
the path a moving object follows
work
using force to move an object
motion
a change in an object's position
distance
the measure of how far an object as traveled
simple machine
a device with few parts that makes work easier by changing the strength or direction of a force
gravity
a force that pulls objects toward each other
speed
how fast or slow an object is moving
inclined plane
a skateboard ramp
screw
an inclined plan wrapped around a cylinder
wedge
two inclined planes together, like an ax
wheel and axle
a doorknob; changes a weak circular force to a strong one
lever
a hammer, when used to remove nails or a stiff bar and a fixed point
pulley
a rope and a wheel
forces
gravity, friction and magnetism
force
push or pull
friction
a force that slows down or stops motion between two surfaces that touch
magnetism
a force that pushes or pulls some materials