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Tuesday, November 15, 2011. Bellringer If you have paperwork to turn in, please leave it on your desk. I will get it. Copy the “I can” statement from the board. Fill out your agenda. Remember CHAMPs expectations!. CHAMPs C: 0 (when the bell rings)

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tuesday november 15 2011
Tuesday, November 15, 2011

Bellringer

  • If you have paperwork to turn in, please leave it on your desk. I will get it.
  • Copy the “I can” statement from the board.
  • Fill out your agenda.
  • Remember CHAMPs expectations!

CHAMPs

C: 0 (when the bell rings)

H: quietly ask a neighbor; after bell, raise hand

A: independent work

M: 0 (after bell rings)

P: silently completing bellringer

balanced and unbalanced forces

Balanced and Unbalanced Forces

Introduction to Unit 3 – Forces and Motion

forces and motion notes
Forces and Motion Notes

Passing Lane

Notes

  • Key Idea
    • Detail
    • Detail
  • Key Idea
    • Detail
    • Detail
what is a force
What is a force?
  • A force is a push or pull that causes an object to move, stop, or change direction
what is a force1
What is a force?

A. A push

B. A pull

C. Anything that causes a change in motion

D. All of the above

force
Force
  • Forces come in pairs
  • Forces have a magnitude and a direction

Magnitude: 5N

Direction: north (up)

5N, north (up)

slide8

Forces can be represented by arrows.

  • The size of the arrow represents the magnitude and the point shows its direction.
what units are used to measure forces
What units are used to measure forces?
  • A. Grams
  • B. Meters per second
  • C. Newtons
  • D. Arrows
what symbol is used in diagrams to indicate a force
What symbol is used in diagrams to indicate a force?
  • A star
  • An arrow
  • A dotted line
  • The letter “F”
net force
NET FORCE
  • When all forces are combined together it is called the net force.
  • Forces in the same direction combine by addition.
  • Forces in opposite directions combine by subtraction.
wednesday november 16 2011
Wednesday, November 16, 2011

Bellringer

  • If you have paperwork to turn in, please leave it on your desk. I will get it.
  • Copy the “I can” statement from the board.
  • Fill out your agenda.
  • Remember CHAMPs expectations!

CHAMPs

C: 0 (when the bell rings)

H: quietly ask a neighbor; after bell, raise hand

A: independent work

M: 0 (after bell rings)

P: silently completing bellringer

balanced and unbalanced forces1
Balanced and Unbalanced Forces
  • Forces occur in pairs and they can be either balanced or unbalanced
balanced forces
Balanced Forces
  • Balanced forces do not cause change in motion
  • Net Forces=0
  • They are equal in size and opposite in direction
group question
Group Question
  • Draw a Balanced Seesaw Showing Forces
unbalanced forces
Unbalanced Forces
  • An unbalanced force always causes a change in motion.
  • When unbalanced forces act in opposite directions you can find the net force
    • Net force
      • Magnitude
        • The difference between the two forces
      • Direction
        • Direction of the largest force
unbalanced forces1
Unbalanced Forces

3 N, right 6 N, left = 3N, left

unbalanced forces2
Unbalanced Forces

4 N, left 10 N, right =

6N, right

unbalanced forces3
Unbalanced Forces

5 N, right + 10 N, right =

15N, right

group question 2
Group Question 2

Draw An Unbalanced Seesaw Showing Forces

slide23

Two tugboats are moving a barge. Tugboat A exerts a force of 3000 newtons on the barge. Tugboat B exerts a force of 5000 newtons in the same direction. What is the combined force on the barge?

A. 2000 Newtons

B. 5000 Newtons

C. 3000 Newtons

D. 8000 Newtons

group question 3
Group Question 3

Draw arrows showing the individual and combined forces of the tugboats.

slide25

Suppose that Tugboat A exerts a force of 2000 newtons on the barge and Tugboat B exerts a force of 4000 newtons in the opposite direction. What is the combined force on the barge?

A. 2000 Newtons

B. 4000 Newtons

C. 6000 Newtons

D. 8000 Newtons

group question 4
Group Question 4
  • Draw arrows showing the individual and combined forces of the tugboats
slide27
Could there ever be a case when Tugboat A and Tugboat B are both exerting a force on the barge but the barge doesn’t move?

A. Yes

B. No

a quick recap
A Quick Recap
  • Forces are a PUSH or PULL
  • Unbalanced Forces cause a change in motion.
  • No motion occurs when forces are balanced.
  • Forces are measure in NEWTONS.
  • Forces are represented by arrows.
  • The overall force is called the NET FORCE
forces and motion notes1
Forces and Motion Notes

Passing Lane

Write 3 questions that can be answered using today’snotes.

(*Place the questions next to the key ideas.)

Notes

  • Key Idea
    • Detail
    • Detail
  • Key Idea
    • Detail
    • Detail
ender
Ender
  • Gauge your understanding of today’s “I can” statement. (Check the line.)
  • On the lines underneath, prove the “I can” statement. (In other words, explain the difference between balanced and unbalanced forces.)
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