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Year 11 General Physics quiz
Motion and Forces Heat and cooling Electricity
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How many significant figures?
2.00 × 103 0.1900
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How many significant figures?
2.00 ×
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Scalar or vector? Force Speed Displacement Distance Mass Work
Acceleration
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Scalar or vector? Force Vector Speed Scalar Displacement Distance Mass
Work Acceleration
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Use this convention Up = + Left =  Right = + Down = 
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Motion You stand on top of a cliff and drop a ball.
What is the sign of the ball’s; Acceleration Velocity Displacement
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Motion You stand on top of a cliff and drop a ball.
What is the sign of the ball’s; Acceleration Velocity Displacement
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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
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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
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Newton’s Laws of Motion
What is Newton’s first law of motion?
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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.
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Newton’s Laws of Motion
What is Newton’s second law of motion?
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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.
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Newton’s Laws of Motion
What is Newton’s third law of motion?
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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.
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What are the equations? Force: Momentum: Kinetic energy:
Gravitational Potential energy: Work: Power:
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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
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Force graph – what is the acceleration?
Force (N) Mass (kg)
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Force graph – what is the acceleration?
Force (N) a = F/m therefore, a = gradient (+) Mass (kg)
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Heat, Temperature and Internal energy
Define: Heat Temperature Internal energy
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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”
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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.
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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.
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Objects A (metal) and B (plastic) are two at the same temperature and have the same mass.
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If 100J of internal energy is removed from each object (A and B), will they be at the same temperature?
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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.
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So which object will have the higher temperature?
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Plastic B
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How did this happen?
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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.
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Accommodating thermal expansion
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Equations Equation for energy associated with temperature change of an object? Equation for energy associated with phase change?
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Equations Equation for energy associated with temperature change of an object? Q = mc∆T Equation for energy associated with phase change? Q = mL
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Equations From Q = mL, there are 2 different L values can that be used. Lf = Latent heat of fusion (solidliquid) Lv = Latent heat of vapourisation (liquidgas)
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Heat transfer For each case, how does heat get transferred?
Table to hand Saucepan to egg in boiling water Sun to Earth
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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
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Why?
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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
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What is the direction of a) electron flow? and b) current?

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Series and parallel circuits
6V 6V
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Series circuit For each bulb, R = 2Ω Voltage through each globe? 6V
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Series circuit For each bulb, R = 2Ω
Voltage through each globe? 6/2 = 3V 6V
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Series circuit For each bulb, R = 2Ω Total resistance? 6V
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Series circuit For each bulb, R = 2Ω Total resistance?
R(total) = R + R = = 4 Ω 6V
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Parallel circuit 6V For each bulb, R = 2Ω Voltage through each globe?
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Parallel circuit For each bulb, R = 2Ω Voltage through each globe? 6V
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Parallel circuit 6V For each bulb, R = 2Ω Total resistance?
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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
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Which device is ohmic?
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Which device is ohmic?
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Rest of lesson… Revise through WACE book OR Revise through STAWA book
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