Presentations text content in Balanced & Unbalanced
Slide1
Balanced & Unbalanced Forces
Presented by Kesler Science
Slide2What are balanced and unbalanced forces?
How do unbalanced forces cause a change in position, direction, and speed of an object when acted upon by unbalanced forces?
Essential Questions:
Slide3Force
A push or a pull that causes an object to stop, move, or change direction.Forces push downward toward the Earth’s center (gravity) or push upward on an object (normal or supporting force).
Forces may or may not cause movement.
Ex. 1 – A book pushes down on a table while the table pushes up on the book.
Ex. 2 – A car accelerates(changes speed and direction)causing motion.
Balanced and Unbalanced Forces
© KeslerScience.com
Slide4© KeslerScience.com
Quick Action –
Forces INB Template
Forces
Template
Cut out the
Balanced, Unbalanced, Net Force template.
Fold along the dashed lines.
Glue it to your journal
along the skinny tab
.
Define each term.
Slide5Balanced and Unbalanced Forces
© KeslerScience.com
Balanced Forces
Two forces
equal
in size
and acting in
opposite
directions
on an object.
The object
stays still
or
continues to move at the
same (constant)
speed
and in the
same
direction
.
Slide6Balanced and Unbalanced Forces
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Balanced Forces Examples
At rest
At a constant speed and same direction
At rest
At a constant speed and same direction
At rest
Slide7Unbalanced ForcesTwo forces that are
unequal in size and opposite in direction.
Balanced and Unbalanced Forces
© KeslerScience.com
Always cause a
change in motion in
one of these
areas:
position
direction
speed
Slide8Unbalanced Forces Examples
Balanced and Unbalanced Forces
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10N
20N
Moves Left
The student exerting the strongest force will determine the direction of movement.
Horse #2 is stronger
Changing directions
Slide9Balanced and Unbalanced Forces
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Net Force
The overall forces acting
on an object.
Measured in Newtons (N)
3N
2N
Net Force1N
Which way will they move?
Slide10© KeslerScience.com
Quick Action – Demonstrate Forces
Choose a partner for this activity. The teacher will number off the pairs.
Even
numbered pairs will come up with an example of a
balanced
force, which they will present to the class.
3.
Odd
numbered pairs will come up with an example of a
unbalanced
force, which they will present to the class.
(Use examples of changing either position, speed or direction)
Slide11© KeslerScience.com
Quick Action – Balanced or Unbalanced Template
Balanced or Unbalanced
Template
Cut out the
template
Fold the flaps away from the side that says “Glue this side down”
Glue it to your journal
on the hexagon side that says “Glue this side down”
Answer “balanced” or “unbalanced” under each flap
.
Slide12Balanced and Unbalanced Forces
© KeslerScience.com
How do unbalanced forces cause a change
in position
of an object?
A skier is at the top of a hill
(balanced force). Another skier
bumps him (unbalanced force) causing him to fall down.
This unbalanced forced caused
his
position
to change.
Slide13
Balanced and Unbalanced Forces
© KeslerScience.com
How do unbalanced forces cause a change in
direction
of an object?
A skier is at the top of a hill
(balanced force). Then then the
skier decides to point her skis
down the hill and push off
(unbalanced force).
This unbalanced force causes her
a change in
direction
.
Slide14
Balanced and Unbalanced Forces
© KeslerScience.com
How do unbalanced forces cause a change in
speed
of an object?
A skier is at the top of a hill
(balanced force) at the
beginning of a race. As he flies down the mountain (unbalanced
force) he picks up speed.
This unbalanced force causes him
a change in
speed
.
Slide15
Check for Understanding
Can you
…
1.
Describe balanced and unbalanced forces?
2. Identify and describe how unbalanced forces cause a change in position, direction, and speed of an object when acted upon by unbalanced forces?
© KeslerScience.com
Balanced & Unbalanced
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