Transcript force

Warm-up
• Get your green folder out
• Label a new page “ Force and Motion
Notes”
• Underneath your new title write the
definition for force
• Turn to your vocabulary page
Vocabulary
-Reference Point- the starting point you choose to
describe the location or position of an object
-Position- describes an objects distance and direction
from a reference point
-Displacement- the difference between the initial or
starting position and the final position
-Motion- the process of changing position
-Speed- the distance an object moves in a unit of time
-Velocity- the speed and the direction of a moving
object
-Acceleration- a measure of how quickly the velocity of
an object changes
Objective 6.8 Changes in Force and Motion
•The student is expected to identify
and describe the changes in
position, direction, and speed of an
object when acted upon by
unbalanced forces
What is a force?
How do forces combine?
How do forces affect motion?
What is a Force?
• In science, a force is a push or a pull.
• All forces have two properties:
–Direction and Size
• A newton (N) is the unit that describes
the size of a force.
How do Forces Combine?
• More than one force often acts on an object.
• You can determine the net force on an object by
combining the total of all the forces acting on it.
Forces in the Same Direction
• When forces are applied in the same
direction, they are added to determine
the size of the net force.
Forces in Different Directions
• When two forces act in opposite directions, you
subtract the smaller force from the larger force to
determine the net force.
• The net force will be in the same direction as the
larger force.
Balanced and Unbalanced Forces
• When the forces on an object produce a net
force of 0 N, the forces are balanced.
• There is no change in the motion of the
object.
Balanced Force Example
• The student is
pushing down on
the chair, but the
chair does not
move.
• The floor is
balancing the force
by pushing on the
chair.
Balanced and Unbalanced Forces
• When there is an amount of net force on an
object and it is not 0 N, the forces on the
object are unbalanced.
• Unbalanced forces produce a change in
motion of an object.
Balanced and Unbalanced Forces