Flashcards
AQA AS Physics
Flashcards do conjunto (59)
- 1Definition of precisionThe degree of exactness to which the measurement of a quantity
or value can be obtained and reproduced consistently. - 2AccuracyA measure of confidence in an accurate measurement, often
expressed as an upper and lower limit of the measurement based on the
uncertainty in the measurement - 3Absolute uncertainty isis the size of the range of values in which the "true value" of the measurement probably lies
- 4Fractional uncertaintyAbsolute uncertainty / reading
- 5Percentage uncertainty(Absolute uncertainty / reading) x 100
- 6Reduce percentage uncertainty by...Using a more accurate device. This lowers the absolute uncertainty.
- 7Reduce systematic error by...Setting all equipment to 0
- 8Reduce random error by...Measuring each result more than once
- 9Percentage difference(difference / actual) x 100
- 10Absolute uncertaintyrange / 2
- 11When you have more than one uncertainty you...add them together
- 12When something is directly proportional, to make it equal you...Add a constant (k) before the e
F ∝ e
F = ke - 13Adding a constant to a direct proportionality makes a line on a graph...Straight
- 14When something is indirectly proportional, to make it equal you...Add a constant (k) in place of the 1
F ∝ 1 / e
F = k / e
∴ k = Fe - 15Name the prefixes1. Tera - x10^12 2. Giga - x10^9
3. Mega - x10^6 4. Kilo - x10^3
5. Centi - x10^-2 6. Milli - x10^-3
7. Micro - x10^-6 8. Nano - x10^-9
9. Pico - x10^-12 - 16Scalars?Have magnitude only
- 17Vectors?Have magnitude and direction
- 18Name 9 scalarsDistance, energy, speed, temperature, pressure, time, mass, volume and density
- 19Name 6 vectorsDisplacement, velocity, acceleration, force, weight and area
- 20Define displacementDistance in a direction from a point
- 21Define equilibriumThere is no net moment and the resultant force is 0
- 22Define momentForce times perpendicular distance from the pivot
- 23Unit used for a momentNewton-metre (Nm)
- 24Define a coupleTwo equal forces acting in opposite directions about a pivot
- 25Define torqueWhen a couple or force causes an object to turn
- 26Torque equationForce x perpendicular distance
- 27The principle of momentsSum of clockwise moments equals the sum of anti-clockwise moments about a pivot.
- 28Define speedDistance travelled per unit of time (rate of change of distance)
- 29Define average speedaverage speed = total distance / total time
- 30Define velocityDisplacement travelled per unit of time (rate of change of displacement)
- 31Define average velocityaverage velocity = total displacement / total time
- 32Define accelerationRate of change of velocity
- 33Which equations are used for which component of a half projectile?Horizontal - s = vt
Vertical - s = ut + 1/2at^2 OR
t = root2s/a - 34Define work doneForce x distance in a direction of a force
- 35Define elastic potential1/2 x force x extension
Ep = 1/2Fe - 36Gravitational potential energyGPE = mgh
- 37Kinetic energyKE = 1/2mv^2
- 38Work done =F x cosθ
- 39Energy start =Energy end + work done
- 40PowerRate of change of energy
- 41Power =work done / time
=
energy transferred / time - 42Power equation for moving objectsP = Fv
(F = force causing the motion, v = speed in the direction of motion) - 43Power equation including workP = ΔW / Δt
- 44Define WattWhen work is being done at a rate of 1 Joule per second
- 45Equation for forceF = ma
- 46Equation for extensionF = Ke
- 47Newtons 1st lawEvery body continues in its state of rest or uniform motions (constant velocity) unless acted upon by a resultant force.
- 48Newtons 2nd lawRate of change of momentum is proportional to the force applied and takes place in the direction of the force.
- 49Newtons 3rd lawIf body A exerts a force on body B then body B well exert the same force of the same type on body A but in the opposite direction.
- 50Impulse =Force x time of collision
- 51ReboundFΔt = mv - (-mu)
= mv + mu - 52Elastic reboundΔp = 2mv
- 53In a collision, momentum is...always conserved (not lost)
- 54What is the force constant?Force per unit of extension
- 55What are compressive forces?Pushing together
- 56What are tensile forces?Pulling apart
- 57If something is ductile, it...can undergo large deformation before breaking. It has a large plastic region.
- 58If something is brittle, it...can undergo very little deformation before breaking. It tends to break at the elastic limit
- 59Hookes lawHookes law states that force is proportional to extension
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- Descrição
- A level Physics FlashCards sobre AQA AS Physics, criado por Sarah Barber em 06-09-2016.
- Criado por
- Sarah Barber
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