Tuesday november 15 2011
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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

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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


Tuesday november 15 2011

  • Units are Newtons (N) 1N=1kg m/s2 (mass x acceleration)


Force

Force

  • Forces come in pairs

  • Forces have a magnitude and a direction

Magnitude: 5N

Direction: north (up)

5N, north (up)


Tuesday november 15 2011

  • Forces can be represented by arrows.

  • The size of the arrow represents the magnitude and the point shows its direction.


Forces always exist in pairs

Forces always exist in pairs.

  • True

  • False


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.


Tuesday november 15 2011

Addition of Forces


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


Tuesday november 15 2011

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.


Tuesday november 15 2011

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


Tuesday november 15 2011

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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