Air Hockey Physics Demonstration

PS1B

PS1B: Types of ForcesI 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• Draw in the force vectors

Normal

Weight (mg)

What is the effort force caused by?

Effort Friction

3. Air hockey puck (off & being pushed to the right…not moving…mass added)

• Draw an air hockey puck• It is off and being pushed• Draw in the force vectors

Normal

Weight (mg)

• Why is the weight vector arrow bigger?

• Will this have more or less friction than a lighter hockey puck? Why?

Effort Friction

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

Weight (mg)

Effort Friction

5. Air hockey puck (off & coasting)

• Draw an air hockey puck• It is off and coasting• Draw in the force vectors

Normal

Weight (mg)

Friction

6. Air hockey puck (on & not moving)

• Draw an air hockey puck• It is on and not moving• Draw in the force vectors

Effort

Weight (mg)

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

Effort 1

Weight (mg)

• What is the friction caused by?

Effort 2Friction

9. Air hockey puck (on & pushed right (speeding up)

• Draw an air hockey puck• Draw in the force vectors

Effort 1

Weight (mg)

• What is the friction caused by?

Effort 2Friction

10. Air hockey puck thinner (on & coasting)

• Draw an air hockey puck• Draw in the force vectors

Effort 1

Weight (mg)

• Why is friction smaller?

Friction

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 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 some of it, but I make several mistakes.

4. B: I have an above average understanding. I 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.

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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

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 some of it, but I make several mistakes.

4. B: I have an above average understanding. I 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.

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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 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 some of it, but I make several mistakes.

4. B: I have an above average understanding. I 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.

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