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Introduction to Forces and Motion: Speed Calculation Practice.

Learn about balanced and unbalanced forces, speed calculations, and motion concepts including distance, speed, velocity, acceleration, and more. Practice problems included.

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Introduction to Forces and Motion: Speed Calculation Practice.

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  1. Nov. 14, 2018 You need: Clean paper (2) / pencil Intro to Forces WS Warm Up: Calculate speed if distance is 21 meters and time is 7 min. Show formula, work, final answer with unit. I CAN: recognize and define balanced and unbalanced forces.

  2. Practice these 1.) 103 km = __________ dm 2.) 00.996 hm = __________ km 3.) 65.8 mm = _______ cm

  3. November 2018 Force/Motion Force/Motion Force/Motion Force/Motion Force/Motion Force/Motion Force/Motion

  4. December 2018 Force/Motion Force/Motion Force/Motion Force/Motion Force/Motion Weather Weather Weather Weather Weather

  5. January 2019 Tchr Wkdy Weather Weather Weather Weather Weather ELA/Ma Benchmarks NCFE Science Testing End Qtr? Tchr Wkdy

  6. So…what is motion? Motion is a change in position over time!!

  7. So…what is motion? Distance How fast you travel that distance is your speed! (Speed is the RATE at which you change position).

  8. Motion – Occurs when an object changes _____________ relative to a _____________ ____________. position point reference

  9. -Distance: how ________ an object has traveled. -Displacement: ______________ and _____________ of an object’s change in position from the starting point. far distance direction

  10. How can we describe motion? • Motion can be described by: • DISTANCE (length) • TIME (min, seconds) • SPEED (distance and time) • DIRECTION (which way) • VELOCITY…speed and direction • ACCELERATION (change in motion) • Speed up, slow down, change direction

  11. Speed – the _________________ an object travels per unit of _________________. Also known as the ____________ of change in position. distance time rate

  12. Conversion in the METRIC system… NAME! RIGHT Kilo Hecto km Deka hm dkm deci LEFT centi Meter Liter Gram dm milli cm mm

  13. In math terms… • A “change in position over time” is the same as saying: Distance Speed = Time

  14. Speed = Distance Time Time = Distance Speed Distance = Speed x Time Speed, Distance & Time D S T

  15. A family takes a car trip heading northeast from Durham, NC to Washington, DC. They travel for 4 hours and cover 360 km. What was their average speed? Speed = Distance Time Speed Practice Problems = 360 km 4 h = 90 km/h

  16. Types of speed • Instantaneous • Average • Constant

  17. SPEED – tells you have fast or slow something is moving (changing position). Example = 25 km/h VELOCITY – tells you speed AND DIRECTION! (changing position in a certain direction) Example = 25 km/h EAST Speed vs. Velocity

  18. A family takes a car trip heading northeast from Durham, NC to Washington, DC. Their speed was 90 km/h. What was their VELOCITY? Velocity is SPEED and DIRECTION! Velocity = 90 km/h NORTHEAST Speed Practice Problems

  19. What was the average speed of the runner in the first 5 seconds of the race? Speed = 25 m 5 s Speed = 5 m/s

  20. SLOW MOVEMENT

  21. FAST MOVEMENT

  22. FAST vs. SLOW FAST SLOW

  23. Starting & Stopping

  24. No Motion

  25. Speeding Up Slowing down

  26. Motion Foldable Motion Review • Label the bottom of each flap as shown. • Draw / decorate your top flap with the foldable’s title. By John Smith

  27. Motion Foldable 4. Repeat for constant motion, different speeds (draw two lines on the same graph), and acceleration (speeding up and slowing down). 3. For “No motion,” label the graph axes and draw in the line that would result from a STOPPED object. Describe it in words.

  28. Acceleration Check your work! Different Speeds Constant Motion

  29. Motion Foldable 4. Write in the formula for speed and some example units. 5. Write in the definition for velocity and one example. distance time Speed = Example units: m/s, Km/h Velocity: Speed + Direction (ex. 25 m/s East).

  30. Motion Foldable 6. Write in the formula for acceleration and some example units. 7. Write down the three ways that an object can accelerate. distance time Speed = Example units: m/s, Km/h Velocity: Speed + Direction (ex. 25 m/s East). Final speed – Start speed Time Acc. = Example units: m/s2, Km/h2 Objects accelerate by: • Speeding up • Slowing down • Changing direction

  31. SPEED – tells you have fast or slow something is moving (changing position). Example = 25 km/h VELOCITY – tells you speed AND DIRECTION! (changing position in a certain direction) Example = 25 km/h EAST Speed vs. Velocity

  32. Introduction to FORCES

  33. When you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move. When you drop something, it is PULLED to the ground by gravity. A FORCE is a PUSH or PULL in a particular DIRECTION. FORCES

  34. BIG SCIENCE IDEA FORCES AFFECT HOW OBJECTS MOVE. Forces can affect motion in the following ways: They can make objects: • START MOVING • MOVE FASTER • MOVE SLOWER • STOP MOVING • CHANGE DIRECTION • CHANGE SHAPE FORCES

  35. Identify each picture as a PUSH or a PULL. Is the force causing a change in speed or direction or both? FORCES

  36. Since forces cause changes in SPEED or DIRECTION of an object, we can say that forces change VELOCITY, so…. FORCES Forces cause ACCELERATION.

  37. More than one force can act on an object at one time. What happens to the object when forces act depends on 2 things: FORCES 1) Strength of the Forces 2) Direction of the Forces

  38. When 2 or more forces act on an object, the forces combine to form a net force. FORCES Forces may WORK TOGETHER or OPPOSE each other.

  39. If the forces cancel each other out, and do not cause the object to move, the forces are said to be BALANCED. FORCES If the forces don’t cancel each other out – 1 force is stronger than the others – the forces are UNBALANCED and will cause a CHANGE IN MOTION.

  40. The strength of a force is measured in NEWTONS. The symbol is (N). We use a SPRING SCALE to measure force. MEASURING FORCE

  41. Always “zero” your balance before use. • Pull gently and with constant force. • Practice using your spring scale to drag items across your desk. MEASURING FORCE STOP HERE!

  42. Try on your own! • Take off a shoe (one per table) – keep your socks ON!! • Use the “mystery tool” to push or pull the shoe across the table. • Flip the shoe so that the laces are down and try again. • Write your observations!

  43. Shoe lab Record the amount of force at the moment the shoe first moves! Record your data!

  44. + = 5 N right 5 N right 10 N right Two forces in the same direction can add together to produce a larger net force. COMBINING FORCES

  45. - = 5 N right 10 N left 5 N left Two forces in opposite directions can subtract to produce a smaller net force in the direction of the larger force. COMBINING FORCES

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