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**Speed, Distance, & Time Practice**

TOC FOR 11/2

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**STARTER (write this under the date Nov 1)**

1. Pick a vocabulary word and KISS definition Warm Up On Left hand side, under date 2. Circle your answer and Justify your choice

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II. Practice Add these notes to your Journal.

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MOTION An objects change in position relative to a reference point over a period of time. REFERENCE POINT – A place or object that can be used to determine if an object is in motion.

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**SPEED The rate at which an object moves.**

Depends on the distance traveled and the time taken to travel the distance. D / T

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SPEED EXAMPLE A hockey puck slides along the ice for 3 s before crossing the goal line 6 m away. What is the average speed of the puck before it crossed the goal line? S = D / T S = 6 m / 3 s S = 2 m/s

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**Go over more examples on the board**

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III. Application Worksheet goes here once graded!

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IV. Connection Today your boss informed you that you have a meeting tomorrow morning at 8:00 am. Cool…BUT, it’s in Waco. WACO!! That’s 168 miles away. You don’t know how long it will take to get there, but the speed limit is 70 mph. You don’t want to get a ticket, so what time will you have to leave??

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Hmmmm… Speed = 70mph Distance = 168 mi T = D/T Time = 168/70 = 2.4 hours ** (2.4 is not 2 hours and 40 minutes!!!)*** What time do I leave?

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2.4 is almost 2 ½ hours. .4 = 4/10 Make a proportion! 4/10 = x/60 X = 24 It is actually 2 hours and 24 minutes. I would need to leave at 5:36!

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V. Ending Describe why it’s important to calculate speed (write 4-5 sentences).

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**VELOCITY & ACCELERATION**

TOC FOR 11/9

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Focus Grab your notebook and complete the quiz Turn in once complete

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**Notes on Velocity and Acceleration**

Set up your foldable

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**VELOCITY Speed (D/T) in a given DIRECTION.**

Example: 30 mph heading East

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VELOCITY EXAMPLE What would your velocity be if you traveled 1 km east in 0.5 h? V = D T V = 1 km 0.5 h V = 2 km/h East Direction East

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**ACCELERATION The rate of change in velocity.**

Can be speeding up, slowing down or changing directions

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**CALCULATING ACCELERATION**

Acceleration = Final Velocity – Initial Velocity Time

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ACCELERATION EXAMPLE Example: Riding your skateboard, it takes you 12 s to accelerate from 2 m/s to 8 m/s. What is your acceleration? A = 8 m/s – 2 m/s 12 s A = 6 m/s A = 0.5 m/s2

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Example: Riding your skateboard, it takes you 12 s to accelerate from 8 m/s to 2 m/s. What is your acceleration? A = 2 m/s – 8 m/s 12 s A = - 6 m/s A = m/s2 (slowing down)

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III. Application Worksheet goes here once graded!

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IV. Connection 1. Find the velocity in m/hr of a runner who runs exactly 100m north in exactly 2 hours. 2. What would his acceleration be if he started at that velocity, but ended with a velocity of 75m/hr?

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**V = D/T D= 100m T= 2 hours V = 100/2 = 50 m/hr north**

Acceleration: 75-50 2 25/2 = 12.5 m/s squared

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**V. Ending Fill in your Speed tab from your notes**

Compare and Contrast speed, velocity and acceleration (write 4-5 sentences).

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**FORCE FORCES CAUSE ACCELERATION! Push or pull Affects motion:**

Set the object in motion Stop its motion Change the speed and direction of its motion FORCES CAUSE ACCELERATION!

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**FORCE FACTS Measured in Newtons (N) Act in pairs**

Act in a particular direction

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**Push or Pull? Changing speed, direction or both?**

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**TWO THINGS AFFECTING MOTION**

How strong the forces are The direction of the forces

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NET FORCE When more than one force acts on an object, the forces combine to form a net force. Same direction – ADD Opposite directions - SUBTRACT

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**BALANCED FORCES Opposite in direction & equal in size**

NO change in movement 2000 N 2000 N 2000 N – 2000 N = 0 N

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**UNBALANCED FORCES Not always opposite and not equal in size**

Causes movement 5000 N GRAVITY 1000 N RESISTANCE AIR 5000 N – 1000 N = 4000 N

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**EXAMPLE The forces shown above are PUSHING / PULLING forces.**

The forces above are WORKING TOGETHER / OPPOSITE FORCES? The forces are BALANCED/ UNBALANCED. The forces DO / DO NOT balance. The stronger force is pulling to the RIGHT / LEFT. The weaker force is pulling to the RIGHT / LEFT. Motion is to the RIGHT / LEFT. 100 N 200 N

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**TYPES OF FORCES Buoyant Force Magnetic Force Electrical Force**

Gravitational Force Elastic Force Centripetal Force Frictional Force

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**FRICTION A force opposing (going against) motion**

Brings an object to rest

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FOUR TYPES OF FRICTION Sliding Friction – 2 solid surfaces sliding over each other *** Opposes motion the most! Rolling Friction – Object rolling over a surface Fluid Friction – Object moves through a fluid (liquid or a gas) Static Friction – The force of 2 surfaces in contact but does not cause movement

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FOUR TYPES OF FRICTION

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NEWTON’S 3 LAWS 1ST LAW – When forces are balanced, an object at rest will stay at rest and an object in motion will stay in motion at a constant velocity

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**2ND LAW – Force = Mass x Acceleration**

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**3RD LAW – For every action, there is an equal and opposite reaction**

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**GRAVITY A force of pull between objects Increases as mass increases**

Increase as distance decreases The measure of gravity IS an object’s weight

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