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Speed Intro

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The document discusses motion and speed. It defines key terms like reference point, motion, and speed. It explains that an object is in motion when its distance from another object is changing. A reference point is something used for comparison that is assumed to be stationary. Speed is defined as the rate at which an object moves, and the formula for calculating speed - speed equals distance divided by time - is provided along with examples of using the formula to calculate speed from given distances and times.

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MOTION We now know that unbalanced forces can change motion
Recognizing Motion Textbook pg 17-18 When is an object in motion? Are you or your book moving Compared to the floor? Compared to the sun? What is a reference point? What do we assume about a reference point? For the bus example, why do you think you are moving backward?
Recognizing Motion ANSWERS Textbook pg 17-18 When is an object in motion? When its distance from another object is changing Are you or your book moving? Compared to the floor? NO Compared to the sun? YES What is a reference point? A place or object used for comparison What do we assume about a reference point? It is stationary
Recognizing Motion ANSWERS Textbook pg 17-18 For the bus example, why do you think you are moving backward? Your reference point (the other bus) wasnt stationary You Reference point
Whats a Frame of Reference?
BACKGROUND OR OBJECT USED FOR COMPARISON
NOW WE ARE GOING TO LOOK AT WAYS TO DESCRIBE AND MEASURE MOTION SPEED
HOW DO WE DESCRIBE SPEED? HOW FAST SOMETHING GOES
How do we CALCULATE SPEED? How we describe the speed of a CAR: Miles per hour (MPH) OR Kilometers per hour (km/h) What does the miles or kilometers measure? They are units for distance What does the hour measure? It is a unit for time What does the per or / mean in math? division
SPEED =RATE that an object moves Distance (D) Rate (speed) = Time (T)
DISTANCE Length between two places Distance = rate (speed) x time D= RT Dirt
TIME = d r (speed)T
STEPS IN PROBLEM SOLVING STEP 1. Write the formula STEP 2. Substitute given numbers and units STEP 3. Solve for the unknown.
SAMPLE PROBLEM: At what speed did a plane fly if it traveled 1760 meters in 8 seconds?
SOLUTION Step 1. Question asked What speed so use: Rate (Speed) = Distance/Time
SOLUTION Step 2. substitute distance = 1760 meters substitute time = 8 seconds Speed = 1760 meters/ 8 seconds
SOLUTION Step 3. Do the math to get your answer Speed = 220 meters/second (m/sec)
SAMPLE PROBLEMS: 1. A car travels 240 kilometers in 3 hours. What is the speed of the car during that time? ANSWER: S= d/t S= 240 km/3 hr 80 KM/HR
The speed of a cruise ship is 50 km/hr. How far will the ship travel in 14 hours? Answer: D = ST 700 km

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Speed Intro

  • 1. MOTION We now know that unbalanced forces can change motion
  • 2. Recognizing Motion Textbook pg 17-18 When is an object in motion? Are you or your book moving Compared to the floor? Compared to the sun? What is a reference point? What do we assume about a reference point? For the bus example, why do you think you are moving backward?
  • 3. Recognizing Motion ANSWERS Textbook pg 17-18 When is an object in motion? When its distance from another object is changing Are you or your book moving? Compared to the floor? NO Compared to the sun? YES What is a reference point? A place or object used for comparison What do we assume about a reference point? It is stationary
  • 4. Recognizing Motion ANSWERS Textbook pg 17-18 For the bus example, why do you think you are moving backward? Your reference point (the other bus) wasnt stationary You Reference point
  • 5. Whats a Frame of Reference?
  • 7. NOW WE ARE GOING TO LOOK AT WAYS TO DESCRIBE AND MEASURE MOTION SPEED
  • 8. HOW DO WE DESCRIBE SPEED? HOW FAST SOMETHING GOES
  • 9. How do we CALCULATE SPEED? How we describe the speed of a CAR: Miles per hour (MPH) OR Kilometers per hour (km/h) What does the miles or kilometers measure? They are units for distance What does the hour measure? It is a unit for time What does the per or / mean in math? division
  • 10. SPEED =RATE that an object moves Distance (D) Rate (speed) = Time (T)
  • 11. DISTANCE Length between two places Distance = rate (speed) x time D= RT Dirt
  • 13. STEPS IN PROBLEM SOLVING STEP 1. Write the formula STEP 2. Substitute given numbers and units STEP 3. Solve for the unknown.
  • 14. SAMPLE PROBLEM: At what speed did a plane fly if it traveled 1760 meters in 8 seconds?
  • 15. SOLUTION Step 1. Question asked What speed so use: Rate (Speed) = Distance/Time
  • 16. SOLUTION Step 2. substitute distance = 1760 meters substitute time = 8 seconds Speed = 1760 meters/ 8 seconds
  • 17. SOLUTION Step 3. Do the math to get your answer Speed = 220 meters/second (m/sec)
  • 18. SAMPLE PROBLEMS: 1. A car travels 240 kilometers in 3 hours. What is the speed of the car during that time? ANSWER: S= d/t S= 240 km/3 hr 80 KM/HR
  • 19. The speed of a cruise ship is 50 km/hr. How far will the ship travel in 14 hours? Answer: D = ST 700 km