Chapter 10 Section 1: The Nature of Force
What is force?
-A force is a ______or a ______
-All Forces have a size and a ______
-A force can change the ______ of an object by either
changing the ______or the ______of the object
-The SI unit for force is the ______ (N)
II. Forces acting in objects.
-All forces ______on objects
-For any ______ that occurs, something has to______ the push
(You can’t push nothing!)
-The same is true for any ______
(eg) Some trains are so______ that extra locomotives
are added until the net force provided by all the locomotives
is______ enough to move the train.
-A force acting on an object ______mean ______ will occur
(eg) your exerting a force on the chair ______ sitting on
but it’s not moving because the ______ is also exerting a
force on the chair
-You cannot always tell what is ______ a force or what is
receiving a force.
(eg) Gravity, Static Electricity, Magnetism
III. Determining Net Force
-Net Force is the ______ of all the forces acting on an
object.
-Net force is determined by the ______ of the forces
-When forces act in the ______direction, you ______the forces
todetermine the net force. The net force will be in the ______
direction as the individual forces.
(eg) You and your Mom move the couch. You pull on one end of the couch with a force of 25 N and your Mom pushes on the other end on the couch with a force of 15 N. The forces are in the ______ so 25 + 15 = 40N of net force
-When two forces act in ______ directions, you subtract the
______force from the larger force to determine the net force.
The net force will be in the same direction as the ______force
(eg) Team 8B and the 8B teachers have a Tug of War. Team 8b exerts a force of 100N to the left and the 8B teachers exert a force of 500N to the right (opposite direction of the students). The Net Force would be 500 – 100 = 400N to the right, and the ______would ______the ______!!
-Force and Pressure are ______. Pressure is the______ of
force exerted on a given ______.
(eg) Bed of Nails and Magician: What is the net force of an object when you combine a force of 7N north with a force of 5N south?
IV. Balanced and unbalanced Forces
-If you know the ______ acting on an object, you can
determine the effect the net force will have on the object’s motion.
-Net force tells you whether the forces acting on the object are
______or unbalanced
-When the net force equals_____ the forces are______ and
the object ______ change it’s motion. It will either stay in
motion or it will remain at rest
(eg) Light hanging from the ceiling(gravity pulling down = force of cord pulling up), Bird’s nest in a tree, a hat on your head, a house of cards.
-When the net force is ______than zero the forces are
unbalanced and the object will produce a ______ in motion
(speed/ direction) It will cause the object to speed up, slow down,
stop, start, or change direction.
-An object can ______ to move when the unbalanced forces
are______.
(eg) When a ball is kicked, it receives an unbalanced force, but continues to move long after the force of the kick has ended