Transcript Air Hockey Physics Demonstration

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
2. Air hockey puck (off & being pushed
to the right…not moving)
• Draw an air hockey puck
• It is off and being pushed
• Draw in the force vectors
What is the
effort force
caused by?
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?
Why?
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
5. Air hockey puck (off & coasting)
• Draw an air hockey puck
• It is off and coasting
• Draw in the force vectors
6. Air hockey puck (on & not moving)
• Draw an air hockey puck
• It is on and not moving
• Draw in the force vectors
What is the
effort force
caused by?
8. Air hockey puck (on & pushed right
(not moving)
• Draw an air hockey puck
• Draw in the force vectors
• What is
the friction
caused by?
9. Air hockey puck (on & pushed right
(speeding up)
• Draw an air hockey puck
• Draw in the force vectors
• What is
the friction
caused by?
10. Air hockey puck thinner (on &
coasting)
• Draw an air hockey puck
• Draw in the force vectors
• Why is
friction
smaller?
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
can do it, but make many mistakes.
3. C: I have an average understanding. I can do
0
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
to do this to someone else. I rarely make mistakes.
0
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
can do it, but make many mistakes.
3. C: I have an average understanding. I can do
0
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
to do this to someone else. I rarely make mistakes.
0
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
can do it, but make many mistakes.
3. C: I have an average understanding. I can do
0
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
to do this to someone else. I rarely make mistakes.
0