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34 Cards in this Set
- Front
- Back
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What is newtons first law |
A body will remain at at rest or continue to move with a constant velocity unless it is acting on by an unbalanced force |
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What is Newton's second law |
For a body of constant mass it's acceleration is directly proportional to the resultant force applied, and in the direction of the resultant force |
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What is Newton's third law |
Whenever one body exerts a force on another the second body exerts an equal and opposite force on the first |
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What are the 6 base quantities |
1. Length 2. Mass 3. Time 4. Electric Current 5. Thermodynamic temperature 6. Amount of Substance |
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What is the multiple for c |
10⁻² |
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What is the multiple for m |
10⁻³ |
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What is the multiple for μ |
10⁻⁶ |
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What is the multiple for n |
10⁻⁹ |
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What is the multiple for p |
10⁻¹² |
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what is the multiple for f |
10⁻¹⁵ |
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What is the equation for stress |
σ = F / A |
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What is the equation for strain |
ε = ΔL / L
ΔL = Change in length L. = original length
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What is the Young's modulus equation |
YM = Stress / Strain |
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What is the equation for electrical charge |
Q = I x T |
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What is the equation for potential difference |
V = W / Q |
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What are the three electrical power equations |
P = VI P = I² × R P = V² / R |
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What is potential difference |
The amount of electrical energy converted per coulomb of charge passing between two points |
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What is e.m.f |
The energy converted into electrical energy when a unit of charge passes through it |
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Is power a Scalar or a Vector quantity |
Power is a Scalar |
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What does the graph for internal resistance of a cell look like |
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From this graph, for the internal resistance of a cell, how can you calculate the resistance |
Measure the gradient, and then multiply it by -1 |
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Explain why the resistance of a thermistor increses as it gets cold |
- Charge carrier density increases with temperature - Dominates resistance increase due to lattice vibration |
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In a circuit loop how can the EMF be calculated |
The sum of all the voltages |
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What are super conductors |
Materials that have zero resistance bellow a certin crucial tempature |
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What three factors effect the resistance of a material |
1. Length 3. Material |
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How does length effect the resistance of a material |
- Longer the wire the futher the electrons have to travel, - greater number of interactions with positive ions - Increase in resistance |
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How does Cross Sectional Area effect resistance |
The thicker the wire the greater number of free electrons moving through the same distribution of positive ions, and resistance reduces R ∝ 1/A |
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What is the equation for resistivity |
ρ = RA / L |
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When a switch is closed why do all the clubs light simultaneously
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Electrons drift immediately when the Voltage is applied to all positions
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What is resistivity |
Physics AS Published MS Sum10.indd the resistance of 1m of material of crosssectional area 1 m² |
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What is the difference between distance and displacement |
Displacement has an implied direction, distance doesn’t |
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Describe projectile motion |
Motion in two dimensions the object is acted on by one dimension and no force in the other dimension Uniformly accelerated motion in one direction and constant speed in the perpendicular direction. |
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Define power |
The rate of doing work |
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Define efficiency |
Efficiency is the fraction of input energy that does work Useful energy out/useful energy in |
