Air Hockey Physics Demonstration - Spokane Public Schools by pptfiles

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									Air Hockey Physics
 Demonstration
       PS1B
            PS1B: Types of Forces
I can:
• Describe what causes friction
• Describe the forces acting on an object:
  – normal force
  – frictional forces
  – Weight (mg)
  – Gravity
  – effort force
  – resistance forces
• Describe the relationship between force, mass
  and acceleration
1. Air hockey puck (off & not moving)
• Draw an air hockey puck
• It is off and not moving
• Draw in the force vectors

                    Normal



                     Weight (mg)
2. Air hockey puck (off & being pushed
to the right…not moving)
• Draw an air hockey puck
• It is off and being pushed   What is the
                               effort force
• Draw in the force vectors
                               caused by?
                    Normal
  Friction                        Effort

                     Weight (mg)
3. Air hockey puck (off & being pushed
to the right…not moving…mass added)
                             • Why is the weight
• Draw an air hockey puck      vector arrow bigger?
• It is off and being pushed • Will this have more or
• Draw in the force vectors less friction than a
                               lighter hockey puck?
                      Normal Why?
                     Normal
  Friction                            Effort

                      Weight (mg)
4. Air hockey puck (off & being pushed
to the right…speeding up)
• Draw an air hockey puck
• It is off and being pushed so it speeds up
• Draw in the force vectors

                    Normal
  Friction                           Effort

                     Weight (mg)
5. Air hockey puck (off & coasting)
• Draw an air hockey puck
• It is off and coasting
• Draw in the force vectors

                   Normal
  Friction

                     Weight (mg)
6. Air hockey puck (on & not moving)
• Draw an air hockey puck
• It is on and not moving
                              What is the
• Draw in the force vectors   effort force
                              caused by?
                    Effort



                     Weight (mg)
8. Air hockey puck (on & pushed right
(not moving)
                              • What is
• Draw an air hockey puck       the friction
• Draw in the force vectors     caused by?



                   Effort 1
 Friction                       Effort 2


                     Weight (mg)
9. Air hockey puck (on & pushed right
(speeding up)
                              • What is
• Draw an air hockey puck       the friction
• Draw in the force vectors     caused by?



                   Effort 1
 Friction                       Effort 2


                     Weight (mg)
10. Air hockey puck thinner (on &
coasting)
                              • Why is
• Draw an air hockey puck       friction
• Draw in the force vectors     smaller?



                   Effort 1
 Friction


                     Weight (mg)
11. What causes friction to be stronger?
  – More massive objects
  – More gravity (if a bigger planet)
  – Moving/pushing an object more
  – Moving faster
  – Something that grips the ground more (surfaces
    that grip better)
  – Shape of the object (less aerodynamic)
12. More mass means it will accelerate faster or
slower? Why?
  – Faster
  – Because there is more atoms being pushed onto
    the ground
  – Grips the ground more
  – More friction (resistance force) to overcome
13. Pushing with more force will cause an object
to accelerate faster or slower? Why?
  – Faster
  – Because there is more effort force
   PS1B: Normal, Effort, Friction, Resistance
                    Forces
I can:
• Describe what causes friction
• Describe for an object the:
    • normal force
    • frictional forces
    • Weight
    • Gravity
    • effort force
    • resistance forces
• Describe the relationship between force, mass and
   acceleration
Rate your ability on the following learning target:
          Describe what causes friction
 1. F: I don’t understand how. I make lots of    0
    mistakes.
 2. D: I have a below average understanding. I            0
    can do it, but make many mistakes.
 3. C: I have an average understanding. I can do          0
    some of it, but I make several mistakes.
 4. B: I have an above average understanding. I 0
    could do it myself without help, but I sometimes
    make a few mistakes.
 5. A: Excellent understanding. I could teach how         0
    to do this to someone else. I rarely make mistakes.
   Rate your ability on the following learning target:
Describe for an object the: normal force, frictional forces,
     Weight, gravity, effort force, resistance forces
   1. F: I don’t understand how. I make lots of         0
       mistakes.
    2. D: I have a below average understanding. I            0
       can do it, but make many mistakes.
    3. C: I have an average understanding. I can do          0
       some of it, but I make several mistakes.
    4. B: I have an above average understanding. I 0
       could do it myself without help, but I sometimes
       make a few mistakes.
    5. A: Excellent understanding. I could teach how         0
       to do this to someone else. I rarely make mistakes.
  Rate your ability on the following learning target:
 Describe the relationship between force, mass and
                     acceleration
1. F: I don’t understand how. I make lots of          0
   mistakes.
2. D: I have a below average understanding. I            0
   can do it, but make many mistakes.
3. C: I have an average understanding. I can do          0
   some of it, but I make several mistakes.
4. B: I have an above average understanding. I 0
   could do it myself without help, but I sometimes
   make a few mistakes.
5. A: Excellent understanding. I could teach how         0
   to do this to someone else. I rarely make mistakes.

								
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