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SPEED, DISTANCE, & TIME PRACTICE TOC FOR 11/2

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Warm Up On Left hand side, under date 1. Pick a vocabulary word and KISS definition 2. Circle your answer and Justify your choice I.STARTER (write this under the date Nov 1)

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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. CoolBUT, its in Waco. WACO!! Thats 168 miles away. You dont know how long it will take to get there, but the speed limit is 70 mph. You dont 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 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 its important to calculate speed (write 4-5 sentences).

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VELOCITY & ACCELERATION TOC FOR 11/9

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F ocus 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 12 s A = 0.5 m/s 2

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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 12 s A = - 0.5 m/s 2 (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 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 = 0 N

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UNBALANCED FORCES Not always opposite and not equal in size Causes movement GRAVITY AIR RESISTANCE 5000 N 1000 N 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. 200 N100 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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NEWTONS 3 LAWS 1 ST 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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2 ND LAW Force = Mass x Acceleration

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3 RD 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 objects weight