1
which word described the forces acting on an object that are at rest and not moving?
balanced
what force pulls objects toward the Earth's surface?
gravity
what happens when a magnet is cut into two pieces?
the magnetic fields of each piece are weaker than the original
what causes Earth's magnetic field?
the motion of the liquid iron and nickel in theEarth's outer core
is magnetism a contact force or a non-contact force?
non-contact
what scientific unit is used to measure force and weight?
newton
what word describes materials that are strongly attracted to a magnet?
ferromagnetic
when you pull a chair across the floor, what makes the chair move? what type of force are you exerting?
your applied force
: force can change the mass of an object
FALSE
what object has the greatest gravitational force?
sun
which of these would be attracted to a magnet?
-aluminum can
-silver ring
-copper penny
-iron nail
IRON NAIL
a ball is rolling across the ground. Which of these forces causes the ball to slow down and stop?
friction
What are three things that a force can do?
make an object start or stop moving
change the shape and size of an object
change the direction an object is moving
an object on Earth has a mass of 1 kilogram. What is its WEIGHT?
about 10 N
what are the three objects that are most attracted to a magnet?
iron, nickel, and steel
what is the frictional force that slows objects moving through fluids?
drag
what is one of the four fundamental forces of nature?
-normal
-gravity
-friction
-tension
GRAVITY
What is the definition of the weight on an object?
the weight of an object depends on its mass and the strength of the gravitational force attracting the object
what is Earth's magnetic field called?
magnetosphere
what is the support force between two objects in contact with another?
normal force