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8/8/2019 Force Ppt Thursday
1/12
Balanced and Unbalanced Forces
SWBAT describe whether the force related to an objectsmotion is unbalanced or balanced and explain their rationale
for choosing or not choosing 1 of 4 answer choices.
BM#: 10, 22
8/8/2019 Force Ppt Thursday
2/12
Do Now
1. What is your goal grade for the2nd report period?
2. Name one thing you can dobetter second report period thanfirst report period.
8/8/2019 Force Ppt Thursday
3/12
Benchmark
Dont have all of the data yet
I think we did well!
For every point you got above the
Mastery average on thebenchmark, you get one ticket
(and one bonus point)!
8/8/2019 Force Ppt Thursday
4/12
Force
What is it?
A push or pull.
When you push or pull an object, you exert a
force on that object.
Is the force
exerted
here a push or pull?
Push
Pull
8/8/2019 Force Ppt Thursday
5/12
Force
SI unit for force is Newtons (N)
Both direction and strength
Represented by an arrow.
Are the forces shownworking together or
opposite?
Are the forces equal or
not? How do you
know?
8/8/2019 Force Ppt Thursday
6/12
Force
More than one force can act on an
object at one time.
Can be either balanced or
unbalanced
8/8/2019 Force Ppt Thursday
7/12
Balanced Forces
Equal forces acting on an object, in opposite
directions, do not change the objects motion.
Why is this an
example of a
balanced force?
book
table
8/8/2019 Force Ppt Thursday
8/12
Unbalanced Forces
Unequal force acting on an object
Cause a change in motion
Cause object to start moving, stopmoving or change direction.
Why is this an
example of a
unbalanced
force?
book
table
8/8/2019 Force Ppt Thursday
9/12
Guided Practice
8/8/2019 Force Ppt Thursday
10/12
Guided PracticeTwelve students played tug-of-war during Mr. Pops gym class. Fortwo minutes, each team of 6 pulled in opposite directions without
moving from their starting positions. What must be true about the
force being exerted?
a) The boys on each team exert more force than the girls._______________________________________________
b) One team exerts more force than the other so it is an
unbalanced force.
________________________________________________
c) Both teams exert the same amount of force so it is a balancedforce
________________________________________________
d) Both teams exert the same amount of force so it is an
unbalanced force
_________________________________________________
Distracter- Not enough information
Wrong- the same force for both teams
Correct balanced force no movement
Wrong unbalanced force exert differents amount of force
8/8/2019 Force Ppt Thursday
11/12
Independent Practice
Complete each question. Use
reading and notes if necessary.
Work silently and independently
When finished, complete exitassessment and begin homework.
8/8/2019 Force Ppt Thursday
12/12
Exit AssessmentSelect the correct response. Then, explain why the answer iscorrect and why the other answers are incorrect.
John and Mark were pushing a box in opposite directions.
John managed to move the box and Mark 2 feet. Which of
these statements must be true?
a) Balanced forces are acting on the box.
b) Unbalanced forces are acting on the box
c) Mark is applying the same amount of force as John.d) Mark stopped pushing the box.