29 terms

# Force and Motion

vocabulary words for 5th grade force and motion science unit

#### Terms in this set (...)

gravity
the invisible force of attraction between all masses in the universe (pull)
law
statement about how things work in nature that seems to be true
Isaacc Newton
Defined the laws of motion and gravity. Tried to explain motion of the universe.
laws of motion
Three laws, came up by Sir Isaac Newton, that describe how objects move in relation to the forces acting on them.
unbalanced force
an object to start moving, stop moving, or change direction
1st law of motion
an object at rest stays at rest and an object in motion stays in motion unless acted on by an unbalanced force
friction
the resistance caused when one object is moved in contact with another
2nd law of motion
an object with an unbalanced force acting on it will accelerate in the direction of that force...f=m(a) ; force = mass times acceleration
3rd law of motion
for every action there is an equal and opposite reaction
inertia
likely to maintain a state of rest unless acted upon by an external force
mass
the amount of matter in an object
momentum
(n) the force with which something moves
scales
the ratio between the size of something and a representation of it
weight
A measure of the force of gravity on an object
motion
a change of position of an object
velocity
the measure of the speed and the direction of an object
speed
the measure of an objects distance during a unit of time
force
push or pull of any kind
acceleration
any change in the speed or direction of an object's motion
thrust
the force that moves an object forward
drag
the force that slows an object down
lift
upward force on an object
energy
the ability to do work
work
the transfer of energy from one object to another
potential energy
stored energy, energy ready to be released
kinetic energy
the energy of motion
balanced force
two or more forces that are equal and opposite of one another; do not cause change in motion
newton
unit of force
air resistance
frictional force air exerts on a moving object; acts opposite in direction to the object's motion