Directions on How to Use the
Flashcards
1. Print the cards, and paste the
pictures on the back of the
vocabulary cards.
2. After you paste the pictures on
the back of the cards, cut thecards
out.
3. Try to match the vocabulary word
with the correct definition. You
will know if you’re correct if the
pictures match up.
*The vocabulary terms and their definitions were taken
from Prentice Hall: Science Explorer
Force
A push or pull exerted
on an object.
Net Force
The overall force on
an object when all the
individual forces
acting on an object are
added together.
Unbalanced
Forces
A nonzero net force,
which changes an
object’s motion.
Balanced Forces Equal forces acting on
an object in opposite
directions.
Inertia
The tendency of an
object to resist any
change in its motion.
Mass
The amount of matter
in an object.
Newton
A unit of measure that
equals the force
required to accelerate
one kilogram of mass
at 1 meter per second
Friction
The force that one
surface exerts on
another when the two
rub against each other.
Sliding Friction Friction that occurs
when one solid
surface slides over
another.
Rolling Friction Friction that occurs
when an object rolls
over a surface.
Fluid Friction
Gravity
Friction that occurs as
an object moves
through a fluid.
The force that pulls
objects toward each
other.
Free Fall
The motion of a
falling object when
the only force acting
on it is gravity.
Projectile
An object that is
thrown.
Air Resistance The fluid friction
experienced by
objects falling through
the air.
Terminal Velocity The maximum
velocity a falling
object can achieve.
Weight
Momentum
The force of gravity
on an object at the
surface of a planet.
The product of an
object's mass and
velocity.
Law of
Conservation of
Momentum
The rule that the total
momentum of objects
in an interaction does
not change.
Satellite
Any object that travels
around another object
in space.
Centripetal Force A force that causes an
object to move in a
circle.