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31 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Rate of Movement equation |
Distance/Time |
You can calculate an object's speed of you know the amount of time taken to move a certain distance |
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Velocity equation |
Displacement/Time |
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Vector |
A quantity for which the direction must be stated |
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Scalar |
A quantity for which the direction is not important |
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Acceleration equation |
Change in velocity -------------------------------------------------- Time taken to change the velocity |
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What is used to calculate the resultant force of two perpendicular forces? |
Pythagoras' Theorem |
a^2 + b^2 = c^2 |
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Moment equation |
Force(N) x Perpendicular force from the pivot to the line of action of the force (m) |
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What is Equilibrium? |
If the resultant force acting in an object is equal to 0 |
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Newton's First Law of Motion |
An object will remain at rest, or in a state of uniform motion, until acted on by a resultant force |
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Newton's Second Law of Motion |
If an object's mass is constant, the resultant force needed to cause an acceleration is given by the equation: ΣF = ma |
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Newton's Third Law of Motion |
For every action, there is an equal and opposite reaction |
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What can you do to calculate the resultant force of a free body diagram? |
1. Draw a scaled diagram. 2. Use Pythagoras' theorem |
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What do you need to use to calculate resultant forces if the forces do not make a right-angled triangle? |
Draw a scaled diagram |
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How many objects are in a free body diagram? |
1 |
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Describe rotational equilibrium |
When the anti-clockwise and clockwise moments are equal |
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What is the centre of gravity of an object? |
The point at which the mass appears to be concentrated |
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How do you calculate the centre of mass of a 2D symmetrical object? |
The centre of gravity will lie where the lines of symmetry cross |
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What does ΣF=ma mean? |
Resultant force(N) = Mass(kg) x Acceleration(ms^-2) |
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What is the equation for Current using Charge and Time? |
Current (A) = charge passing a point (C) /time for that charge to pass (s) |
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What is the simple for Current using charge? |
I= 🔺 Q / 🔺 T |
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What is 1 Coulomb (C) equal to? |
e = 1.6x10^-19C |
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Voltage =? |
Voltage(V) = energy transferred (J) / charge passing (C) |
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What is emf? |
Emf is a supply voltage. The voltage going into a circuit |
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What is Potential Difference? |
The voltage being used by a component in a circuit |
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Describe the difference between emf and p.d |
Emf is voltage into a circuit, p.d is voltage out of a circuit |
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What is the equation for resistance? |
Resistance (Ω) = [resistivity(Ωm) x sample length(m)] / cross-sectional area (m^2) |
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What does SUVAT stand for and what are the units it is measured in? |
S- Displacement (m) U- Initial velocity (ms^-1) V- Final velocity (ms^-1) A- Acceleration (ms^-2) T- Time (s) |
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P=E/t |
P=W/t |
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When is there an expedition to Ohm's law? |
When I is inversely proportional to V at a constant temp |
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Merge the terms P=VI and V=IR |
P=V^2/R |
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What equation links Current, Charge and Time? |
I=🔺 Q/🔺 t |
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