1. Air Hockey Physics Demonstration PS1B

2. 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

3. 1. Air hockey puck (off & not moving) Draw an air hockey puck It is off and not moving Draw in the force vectors

4. 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?

5. 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 Why is the weight vector arrow bigger? Will this have more or less friction than a lighter hockey puck? Why?

6. 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

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

8. 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?

9. 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?

10. 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?

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

12. 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)

13. 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

14. 13. Pushing with more force will cause an object to accelerate faster or slower? Why? – Faster – Because there is more effort force

15. 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

16. 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. 0000000000

17. 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. 0000000000

18. 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. 0000000000