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Take out your morning article and begin working silently.
When you finish, you may take a book from the bookshelf.
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Agenda: Homework and flash cards due Friday.
1. Explain the motion of [figure a] in the picture. Be sure to describe the reference directions.
2. What is the reference point in this example?
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7.P.1.2 Explain the effects of balanced and unbalanced forces acting on an object (including friction, gravity and magnets)
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Vocabulary Words
1. unbalanced force
2. balanced force
3. mass
4. friction
5. gravity
6. inertia
7. velocity
8. newtons
9. magnets
10. force
11. frame of reference
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Balanced Force
Balance forces are two forces acting in opposite directions on an object, and equal in size. Anytime there is a balanced force on an object, the object stays still or continues moving continues at the same speed and in the same direction.
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Unbalanced Force
1. When two forces acting on an object are not equal in size.
2. Unbalanced forces cause: a still object to move, an object to speed up or slow down, a moving object to stop, a moving object to change direction.
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Magnet
An object that is surrounded by a magnetic field and that has the property, either natural or induced, of attracting iron or steel.
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newton
(symbol: N) is the International System of Units (SI) derived unit of force.
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Notebook Title: Speed and Motion
Testable Question: How can you measure speed?
= Raise your hand to ask questions during the lab
= stay positive and work as a team!
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Motion
Definition: A change in position over time.
The ball moved from position 6 to position 3.
1 2 3 4 5 6 7 8 9
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Speed
Definition: The rate of motion. (how fast motion happens)
Speed is the measure of how fast something moves or the distance it moves, in a given time.
Ball 1 moved 5 meters in 2 seconds.
(Slower speed)
Ball 2 moved 10 meters in 2 seconds.
(Faster speed)
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Calculating Speed
speed = distance ÷ time
Units: meters/seconds (m/s) miles/hour (mph)
kilometers/hour (km/h)
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1. If something travels 50 miles in one hour, what is its speed?
2. If something travels 4 meters in one second, what is its speed?
3. If something travels 10 miles in two hours, what is its speed?
= 50 miles per hour
= 4 meters per second = 4 m/s
= 5 miles per hour
50 miles
1 hour
4 meters
1 second
10 miles
2 hours
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CORNELL SYTLEQuestion NotesWhat is speed? Speed is the measure
of how fast something moves or the distance it moves in a given amount of time. (RATE of MOTION)
How are speed and position related? (hint: the library is 2 blocks away or the library is 5 minutes away)
Speed and position both deal with where an object is.
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Question NotesWhat is the formula used to calculate speed?
Speed = distance divided by time
S=d/t
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Practice Calculating Speed1. A man runs 200 m in 25 s. What is his speed?
2. If you travel 100 m in 50 s, What is your speed?
3. A women traveled 500 m in 20 s. What was her speed?
4. A wheelchair racer completes a 100 meter course in 20 seconds.
200 m / 25 s = 8 meters per second
100 m / 50 s = 2 meters per second
500 m / 20 s = 25 meters per second
100 m / 20 s = 5 meters per second
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Speed Triangles!
Flip over your note sheet to see how they work!
D
S T÷
x
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1. Speed = _______ _______
S
D
T
÷
x
Distance
Time
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2. Distance = _______ _______
S
D
T
÷
x
Speed
Time
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3. Time = _______ _______
S
D
T
÷
x
Distance
Speed
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4. Distance = 10 meters, Time = 1 sec.Speed =
S
10 m
1 s
÷
x
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5. Distance = 50 meters, Time = 10 sec.Speed =
S
D
T
÷
x
50 meters
10 seconds
5 m/s
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6. Distance = 80 miles, Time = 2 hoursSpeed =
S
D
T
÷
x
80 miles
2 hours
40 m/h
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7. Distance = 80 miles, Speed = 40 miles/hourTime =
40 miles/hour
80 miles
T÷
x
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Sometimes, speed questions are word problems. Just set up your speed triangle!
1. Joe jogged for 1 hour. He ran 6 miles. What was his speed in miles/hour?
2. Alex jogged for 2 hours. He ran 4 miles. What was his speed in miles/hour?
6 miles / 1 hour = 6 m/h
4 miles / 2 hours= 2 m/h
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3. Jose threw a ball. It traveled 50 meters in 5 seconds. What was its speed in meters/second?
4. Ms. Reynolds was going 60 miles/hour on the freeway. How far did she get after 1 hour?
5. Ms. Wright was going 60 miles/hour on the freeway. How far did she get after 2 hours?
50 meters/ 5 seconds= 10 m/s
60 miles x 1 hour = 60 miles
60 miles x 2 hours = 120 miles
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Can you calculate speed with speed? Use speed triangles to solve practice problems.
The first person in each table to get all correct will win a prize! Work independently (silently).Raise your hand if you have a question.Be on task!
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Exit Ticket
1. Speed = ________ _________
2. A train travels for 3 hours. It goes 90 miles. What was its speed?
3. A car is going 60 miles/hour. How far will it go in half an hour?
4. A boat is going 25 miles/hour. How long will it take for it to travel 100 miles?
5. 1 mile/minute = ___ miles/hour