Transcript What are balanced and unbalanced forces

By: Carly Fitzgerald and Hailey Woulfe
What are balanced
and unbalanced
forces?
Tech Terms:
Balanced Forces- Forces that are
equal in size but opposite in
direction.
Force- Push or Pull
Unbalanced forces- Forces that
cause a change in the motion of
an object
Balanced Forces:
 Any push or pull is a force. To describe a force,
you must know two things. You must know the size
of the force and the direction of the force.
Suppose two teams are playing tug of war. Each
team is pulling with equal force, but in opposite
directions. Neither team can make the other team
move. You can also think of it as two people
wrestling. They both push against each other with
equal force, but in opposite directions.
QUICK QUIZ! QUICK QUIZ! QUICK QUIZ!
Question # 1- A ______ is a push or a
pull.
Question #2- Balanced forces can’t
change an object’s ______.
WORD BANK:
Cats, Force, Pie, Speed, Acceleration, Motion, Gravitational
Pull, Dumpster, Stones.
Unbalanced Forces:
 Forces that create a change in the motion of
an object are Unbalanced Forces.
Unbalanced Forces are not equal and
opposite.
 If one of the teams in the tug of war game
pulls harder than the other team, the forces
wouldn’t be equal anymore. One team
would be able to pull the other team down.
QUICK QUIZ! QUICK QUIZ! QUICK QUIZ!
Question #3- If you push against a wall,
the wall pushes back with an equal
but _____ _____.
a) Ice Cream
b) Opposite force
c) Opposite gravity
d) Jonas Brothers
Force and Motion:
Unbalanced Forces can change the motion of an
object in two ways:
 When unbalanced forces act on an object at rest,
the object will move.
 When unbalanced forces act on a moving object, the
velocity of the object will change. Remember that a
change in velocity means a change in speed,
direction, or both speed and direction.
Lesson Summary
 Forces that are equal in size but opposite
in direction are called balanced forces.
 Balanced forces do not cause a change
in the motion of objects.
 Forces that cause a change in the motion
of objects are called unbalanced forces.
 Unbalanced forces can change the
motion of an object in two ways.
Apply/ Analize- #6 on paper
A skater is moving from east to west across a frozen pond. Her
speed is 4 m/sec. Someone gives her a push. As a result of the
push, her speed increases to 6m/sec in the same direction.
a)
b)
Is the push a balanced force or an unbalanced force? How do
you know?
In what direction was the push applied? How do you know?
Please write this on a piece of loose leaf paper and hand it in to
Hailey or Carly and we will grade them. Thank you.
Quick Quiz Answers:
Question #1- A force is a push or a pull.
Question #2- Balanced forces can’t change
an object’s motion.
Question #3- If you push against a wall, the
wall pushes back with an equal but
Opposite Force. (B)
Balanced
Unbalanced
The
End!!
Ok, you can go now…
Seriously, go.
Leave.
Don’t come back.
Good.Bye.
You’re getting on my nerves.
Go away!!
*stomp* *stomp*
By:
Carly Fitzgerald, Hailey
Woulfe, and Stan the
Smart Board Man.