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Velocity

How did you get to school today?. Velocity. Velocity. How fast were you going? How would you measure how fast you were going?. Velocity. What two things do we have to know to find velocity?. Velocity. Units for measuring velocity, or speed, include: Miles per hour (mph)

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Velocity

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  1. How did you get to school today? Velocity BAIP PowerPoint Template

  2. Velocity How fast were you going? How would you measure how fast you were going? BAIP PowerPoint Template

  3. Velocity What two things do we have to know to find velocity? BAIP PowerPoint Template

  4. Velocity Units for measuring velocity, or speed, include: • Miles per hour (mph) • Meters per second (m/s) • Kilometers per hour (km/h) • What do all of these units have in common? • What two things do we have to know in order to find velocity? BAIP PowerPoint Template

  5. d v t Velocity • Velocity = distance / time • v=d/t • Example: miles per hour. Miles is the distance, and hour is the time. BAIP PowerPoint Template

  6. d v t Velocity Pick a state you would like to drive to. Let’s see how long it would take us to get there. BAIP PowerPoint Template

  7. Acceleration • How many of you have ever jumped over something? • How many of you have jumped on a trampoline? • Did you notice anything about how fast you were moving? • Did you change direction? BAIP PowerPoint Template

  8. Acceleration • When something falls, does how far it falls make any difference? BAIP PowerPoint Template

  9. Acceleration • What happens as the tennis ball falls, and what happens when it bounces back up? • Do you notice anything about its velocity or the direction it moves? BAIP PowerPoint Template

  10. Acceleration • Have you ever been hit in the head by something before? • Does it hurt more if the object falls from just above your head or if it falls from the ceiling? BAIP PowerPoint Template

  11. Acceleration • If you roll something down a ramp, does it have the same velocity all the way down? • What about if you try to roll a car up a ramp? BAIP PowerPoint Template

  12. Acceleration • The car speeding up as it goes down the ramp is called ________. • And the car slowing down is called _______. • What does this mean for objects that are falling? BAIP PowerPoint Template

  13. Mass • How many of you have ever lifted an object and thought to yourself, “WOW, this is really heavy!”? • What if I told you that you could lift that same object easily if I flew you to the moon? BAIP PowerPoint Template

  14. Mass BAIP PowerPoint Template

  15. Mass BAIP PowerPoint Template

  16. Mass • Do the objects under water feel the same as they did outside of the water, or do they feel different? • Did the objects change, or do the objects look different? BAIP PowerPoint Template

  17. Mass • Did you happen notice how much heavy equipment the astronauts were wearing? • Each suit weighs almost 200 pounds. Yet they walk around and jump like it’s no big deal. Why is that? BAIP PowerPoint Template

  18. Mass • Did the astronauts get smaller on their way to the moon? • Did their suits all of a sudden lose pieces? • Their weight may have changed, but did they lose any mass? BAIP PowerPoint Template

  19. Force The book on this desk has not moved since class began. • Why has it stayed still? • What can we do to make it move? BAIP PowerPoint Template

  20. Force Any push or pull on an object is called a force. In order for something to move, something else must push or pull on it. BAIP PowerPoint Template

  21. Force Can we move objects without physically pushing or pulling on them? Try to move some objects without touching them. BAIP PowerPoint Template

  22. Force • What might push an object if you are blowing on it? • What might pull an object as it falls to the ground? BAIP PowerPoint Template

  23. Force • A force is any push or pull. • Anytime something moves, there is a force present. • Sometimes you can push or pull on something, and it doesn’t move. Why is that? BAIP PowerPoint Template

  24. Force Let’s look at the difference between a golf ball and a bowling ball. In order for an object to move, we must apply a force. • Which one is harder to push, a golf ball or a bowling ball? • Why? BAIP PowerPoint Template

  25. Concept 1 - Newton’s First Law of Motion • What happens to the card and the coin if I flick the card off the cup? • To what object did I apply a force? BAIP PowerPoint Template

  26. Concept 1 - Newton’s First Law of Motion What path will a marble take if you roll it across a flat, level surface? BAIP PowerPoint Template

  27. Concept 1 - Newton’s First Law of Motion • What path will the marble take if you roll it toward a book? BAIP PowerPoint Template

  28. Concept 1 - Newton’s First Law of Motion • If a soccer ball is sitting motionless in the grass, will it start to move on its own? BAIP PowerPoint Template

  29. Concept 1 - Newton’s First Law of Motion Newton’s First Law of Motion - “an object at rest will remain at rest unless a force acts on it.” Also, “an object in motion will remain in motion unless a force acts on it.” BAIP PowerPoint Template

  30. Concept 1 - Newton’s First Law of Motion • What path will the marble take if you roll it along the inside of a styrofoam plate? BAIP PowerPoint Template

  31. Concept 1 - Newton’s First Law of Motion • Why didn’t the marble go straight? BAIP PowerPoint Template

  32. Concept 1 - Newton’s First Law of Motion If we cut out a 1/4 of a wedge from the plate and rolled the marble along the inside of the plate, what path will the marble take? • It will continue on a curved path and end up back on the plate. • It will roll off the plate but continue on a curved path. • It will roll off the plate and go straight. • It will roll off the plate and curve away from the plate. BAIP PowerPoint Template

  33. Concept 1 - Newton’s First Law of Motion The correct answer is C. The marble will roll off the plate and continue rolling in a straight line. Without anything (the edge of the plate) to force it in a different direction, the marble will go straight. BAIP PowerPoint Template

  34. Concept 1 - Newton’s First Law of Motion With a constant force from the edge of the plate, the marble will continue around the curve. When it comes to the missing edge, that force is gone, and the marble will move in a straight line. BAIP PowerPoint Template

  35. Concept 1 - Newton’s First Law of Motion A moving object will continue to move in a straight line unless a force changes its direction. BAIP PowerPoint Template

  36. Concept 1 - Newton’s First Law of Motion • Tie an object to the end of a string and begin twirling it around in a circle. • What force is keeping the object moving in a circle? BAIP PowerPoint Template

  37. Concept 2 - Newton’s Second Law of Motion Did we do anything to the chair? BAIP PowerPoint Template

  38. Concept 2 - Newton’s Second Law of Motion • Who remembers the story of the Three Little Pigs? • Today we are going to investigate the science behind this story. BAIP PowerPoint Template

  39. Concept 2 - Newton’s Second Law of Motion • Which ball rolled the furthest during the first set of trials? Why? • Which ball rolled the furthest during the second set of trials? BAIP PowerPoint Template

  40. Concept 2 - Newton’s Second Law of Motion Newton’s Second Law of Motion One part of this law states that “a change inmass (the different balls) and/or a change in force (how hard the you puff) changes the motion (acceleration) of an object.” BAIP PowerPoint Template

  41. Concept 2 - Newton’s Second Law of Motion • Gravity pulls objects toward the earth and causes them to move faster. • The higher an object is dropped from, the faster it will fall until it hits the ground. BAIP PowerPoint Template

  42. Concept 2 - Newton’s Second Law of Motion • Which coin hits the floor first? • Do all of the coins have the same mass? BAIP PowerPoint Template

  43. Concept 2 - Newton’s Second Law of Motion An Object in Free Fall • Gravity is causing those objects to accelerate. • Gravity, on earth, is constant. • Those objects were being accelerated toward earth all the same. BAIP PowerPoint Template

  44. Concept 2 - Newton’s Second Law of Motion • If their acceleration was the same and the mass was different, what is missing from this picture? • If we have objects that have the same acceleration, but different masses, what happens to the force? BAIP PowerPoint Template

  45. Concept 3 - Newton’s Third Law of Motion • Run the string through the straw and then attach both ends of the string to fixed objects. • You want the string to be taut. • Blow up the balloon and tape the balloon to the straw on the string. • Let the balloon go. • Observe your experiment. What happens? • What made the balloon travel the direction it did? BAIP PowerPoint Template

  46. Concept 3 - Newton’s Third Law of Motion • Who is going to move further, the student pushing or the student pushed? • Will the distance the students travel change depending on who pushes? BAIP PowerPoint Template

  47. Concept 3 - Newton’s Third Law of Motion • Whose scale will register the highest force? • Does it change depending on who is pushing whom? BAIP PowerPoint Template

  48. Concept 3 - Newton’s Third Law of Motion Newton’s Third Law of Motion “For every force, there is an equal and opposite force.” BAIP PowerPoint Template

  49. Concept 3 - Newton’s Third Law of Motion • What happens when you lean against a wall? • What can move the wall? • Have any of you ever seen a building knocked down? BAIP PowerPoint Template

  50. Concept 3 - Newton’s Third Law of Motion Directions • Tape the balloon to the longer end of the bent straw. • Put the straight pin through the middle of the bent straw. • Place the bent straw on top of the straight straw (much like you were making a propeller on a helicopter). • Keep the bent straw at 90 degrees. Use the bent straw to blow up the balloon. Release the straw so the air can escape and observe what happens. • What do you notice? BAIP PowerPoint Template

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