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### Balanced and Unbalanced Forces

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

Introduction to Unit 3 – Forces and Motion

What is a force?

- A force is a push or pull that causes an object to move, stop, or change direction

Force

- Forces come in pairs
- Forces have a magnitude and a direction

Magnitude: 5N

Direction: north (up)

5N, north (up)

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.

- True
- False

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?

- A star
- An arrow
- A dotted line
- The letter “F”

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

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

- Forces occur in pairs and they can be either balanced or unbalanced

Balanced Forces

- Balanced forces do not cause change in motion
- Net Forces=0
- They are equal in size and opposite in direction

Group Question

- Draw a Balanced Seesaw Showing 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 Forces

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

Group Question 2

Draw An Unbalanced Seesaw Showing Forces

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

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

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

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

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

- 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 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

- 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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