On a postit write down anything you know about the word force or the different ways you use the word force Scientific Definition A force is a push or a pull of an object When there is a force one object is applying a force and on object is receiving the force ID: 277667
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Slide1
Forces
On a post-it, write down anything you know about the word force or the different ways you use the word force.Slide2
Scientific Definition
A force is a
push
or a pull of an object.When there is a force, one object is applying a force and on object is receiving the force. Slide3
Characteristics Used to Describe a Force
Magnitude (size)- the amount of force being exerted
Direction- the direction in which the force is moving the objectSlide4
Effects of a Force on An Object
MOTION!
-start moving
-stop moving-speed up-slow down-change directionsSlide5
Identifying Forces
Some forces are obvious, because you see where the force is coming from since they act based on touch.
Some forces are not obvious because they can act with out touch.
GRAVITYMAGENTS-STATICSlide6
Measuring a Force
The
unit
used to measure how much force an object is exerting is the Newton.The abbreviation for Newton is N. One Newton can lift one small apple. The tool used to measure force is a spring scale.The more mass an object has, the
more force it will require to move the object.As mass increases, force increases. Slide7
Combining Forces
Sometimes there is more than one force being exerted on an object
The forces being exerted may be working in the same direction.
Example: a plane traveling in the same direction as the windSometimes there are multiple forces acting on an object in different directions. Example: a plane flying against the windSlide8
Think, Pair, Share
:
N
ame all the forces acting on the kite.Are all the forces working in the same direction?Slide9
Net Force
Net force
is the combination of all the measure of all the forces being exerted on an object.
In order to determine the net force when the forces are acting in the same direction, you add up the measure of all the forces. Example: My sister and I are moving a piano together in the same direction. I exerted 15 Newtons while my sister exerted 10
Newtons. What is the net force applied to the piano? ______ N to the ___________ (direction)Slide10
Net Force: Different Directions
To determine the net force on an object with forces acting in different directions, you subtract the smaller force from the bigger force.
When there are forces working in different directions, it will
lessen the force on the object.Slide11
Net ForceSlide12
What does net force tell us?
i
f the object will move
in which direction the object will movehow strong the force is on the objectSlide13
Balanced Forces
A balanced force is produced when two forces are acting in different directions and are equal, which means the net force is 0.
When the forces applied to an object produce a net force of zero, the forces are balanced.
Balanced forces don’t cause movement in an object. Balanced forces will not change the motion of a moving object.Slide14
Unbalanced Force
When the force of an object is not zero, then it is an unbalanced force.
An unbalanced force is when one force is stronger than another force.
An unbalanced force causes a change in the movement of an object.start/stop movementchange direction of movements
peed up/ slow down movementSlide15
Picture Walk
Choose a picture with your group. Then
discuss and answer
the following questions on an index card. Be ready to present the information to the class.What are the forces being exerted on the object?Are the forces balanced or unbalanced?What are the effects of the force?How would you determine the net force being exerted on the object?