1. Year 11 General Physics quiz
Motion and Forces
Heat and cooling
Electricity

2. How many significant figures?
2.00 × 103
0.1900

3. How many significant figures?
2.00 ×

4. Scalar or vector? Force Speed Displacement Distance Mass Work
Acceleration

5. Scalar or vector? Force Vector Speed Scalar Displacement Distance Mass
Work
Acceleration

6. Use this convention
Up = +
Left = -
Right = +
Down = -

7. Motion You stand on top of a cliff and drop a ball.
What is the sign of the ball’s;
Acceleration
Velocity
Displacement

8. Motion You stand on top of a cliff and drop a ball.
What is the sign of the ball’s;
Acceleration
Velocity
Displacement

9. Motion While it’s moving upwards, what’s the sign of it’s;
You throw a ball vertically upwards.
While it’s moving upwards, what’s the sign of it’s;
Acceleration
Velocity
Displacement

10. Motion While it’s moving upwards, what’s the sign of it’s;
You throw a ball vertically upwards.
While it’s moving upwards, what’s the sign of it’s;
Acceleration
Velocity
Displacement

11. Newton’s Laws of Motion
What is Newton’s first law of motion?

12. Newton’s Laws of Motion
What is Newton’s first law of motion?
Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

13. Newton’s Laws of Motion
What is Newton’s second law of motion?

14. Newton’s Laws of Motion
What is Newton’s second law of motion?
The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma.

15. Newton’s Laws of Motion
What is Newton’s third law of motion?

16. Newton’s Laws of Motion
What is Newton’s third law of motion?
For every action force there is an equal and opposite reaction force. Forces act in pairs.

17. What are the equations? Force: Momentum: Kinetic energy:
Gravitational Potential energy:
Work:
Power:

18. What are the equations? Force: F = ma Momentum: p = mv
Kinetic energy: KE = 0.5mv2
Gravitational Potential energy: PE = mgh
Work: W = Fs = ∆E
Power: P = E/t

19. Force graph – what is the acceleration?
Force (N)
Mass (kg)

20. Force graph – what is the acceleration?
Force (N)
a = F/m therefore,
a = gradient (+)
Mass (kg)

21. Heat, Temperature and Internal energy
Define:
Heat
Temperature
Internal energy

22. Heat, Temperature and Internal energy
Heat Defined as the transfer of energy across a boundary due to a temperature difference. It is incorrect to say an object contains “heat energy”, it is correct to say “internal energy”

23. Heat, Temperature and Internal energy
Temperature A measure of how hot or cold something is. Defined from the average kinetic energy of atoms and molecules.

24. Heat, Temperature and Internal energy
Defined as the energy (kinetic and potential) associated with the random, disordered motion of atoms molecules. Also known as ‘invisible’ energy.

25. Objects A (metal) and B (plastic) are two at the same temperature and have the same mass.

26. If 100J of internal energy is removed from each object (A and B), will they be at the same temperature?

27. If 100J of internal energy is removed from each object (A and B), will they be at the same temperature? No, because they will have a different specific heat capacities. Metal has a lower specific heat value which makes it more sensitive to heat transfer.

28. So which object will have the higher temperature?

29. Plastic B

30. How did this happen?

31. Thermal expansion
As the temperature of a liquid or solid increases, the molecules vibrate faster and occupy more space.
This results in a volume increase known as thermal expansion, thus the rails bent.

32. Accommodating thermal expansion

33. Equations
Equation for energy associated with temperature change of an object?
Equation for energy associated with phase change?

34. Equations
Equation for energy associated with temperature change of an object?
Q = mc∆T
Equation for energy associated with phase change?
Q = mL

35. Equations
From Q = mL, there are 2 different L values can that be used.
Lf = Latent heat of fusion (solid-liquid)
Lv = Latent heat of vapourisation (liquid-gas)

36. Heat transfer For each case, how does heat get transferred?
Table to hand
Saucepan to egg in boiling water
Sun to Earth

37. Heat transfer For each case, how does heat get transferred?
1. Table to hand:
Conduction, direct contact
2. Saucepan to egg in boiling water:
Convection, convection currents circulating in water
3. Sun to Earth:
Radiation, no medium in space

38. Why?

39. Static electricity Rub plastic comb with cloth
Electrons transfer from cloth to comb
Comb is negatively charged
Comb brought near neutral paper and attracts positive charges in paper

40. What is the direction of a) electron flow? and b) current?-

41. -

42. Series and parallel circuits6V 6V

43. Series circuit
For each bulb, R = 2Ω
Voltage through each globe? 6V

44. Series circuit For each bulb, R = 2Ω
Voltage through each globe? 6/2 = 3V 6V

45. Series circuit
For each bulb, R = 2Ω
Total resistance? 6V

46. Series circuit For each bulb, R = 2Ω Total resistance?
R(total) = R + R =
= 4 Ω 6V

47. Parallel circuit 6V
For each bulb, R = 2Ω
Voltage through each globe?

48. Parallel circuit For each bulb, R = 2Ω Voltage through each globe? 6V

49. Parallel circuit 6V
For each bulb, R = 2Ω
Total resistance?

50. Parallel circuit For each bulb, R = 2Ω Total resistance?6V
For each bulb, R = 2Ω
Total resistance?
1/R(total) = 1/R + 1/R
= = 1
R(total) = 1/1
R (total) = 1 Ω

51. Which device is ohmic?

52. Which device is ohmic?

53. Rest of lesson…
Revise through WACE book OR
Revise through STAWA book