Year 1 - A level Flashcards
What are the 7 base units?
Mass - kg Time - s Length - m Current - A Amount of a substance - mol Luminosity intensity - Cd Temperature - K
Pick one of these and turn into base units:
- Force (N)
- Energy (J)
- Power (W)
- Frequency (Hz)
- Change (Q)
- Voltage (V)
- Resistance (Ω)
N - Kg m s-2 J - Kg m2 s-2 W - Kg m2 s-3 Hz - s-1 C - A s V - Kg m2 s-3 A-1 Ω - Kg m2 s-3 A-2
What is the difference between vector and scalar?
Vectors have size and direction, scalars only have size
Formula for velocity?
V = change in displacement/time
Formula for average speed?
S = Total distance/Total time
What are the six SUVAT equations?
- s = ((V+u)/2)t
- V = u + at
- s = ut + 1/2at^2
- s = vt + 1/2vt^2
- V^2 = u^2 + 2as
How do you add vectors?
Place them head to tail.
Pnuemonic for sin, cos and tan?
SOHCAHTOA
What is Newton’s first law?
A body remains at rest or travels at constant speed at a constant velocity in a straight line, unless a resultant force acts upon it.
What is Newton’s second law?
In the presence of a resultant force a body experiences an acceleration.
F = ma.
-A change in direction is a change in V therefore acceleration.
-Stationary or constant speed means no resultant force
-De/acceleration must have an overall force acting.
What is Newton’s third law?
For every force that acts there is an equal force of the same type that acts in the opposite direction.
What are the 10 types of energy?
- Chemical
- Elastic
- Electric(static)
- Electric(current)
- Gravitational
- Nuclear
- Light
- Kinetic
- Sound
- Thermal
What equation links power, force and velocity?
P = Fv
What equation links force, time, mass and velocity?
Ft = mv
What equation links work done (not from rest), mass and velocity?
Work done = 1/2mv^2 - 1/2mu^2
What equation links E.P.E, the spring constant(k) and extension of the material?
E.P.E = 1/2 kx^2
What equation links power, work done and time?
P = WD/t
What equation links momentum, mass and velocity?
P = mv or ΔP = mv - mu(momentum is vector so can have an arrow above it to show direction)
What links force, momentum and time?
F = ΔP/t
What links impulse(Ft), mass and velocity?
What is impulse?
Ft = mΔv
Impulse is a force acting for a given time
What is the centre of gravity?
Centre of gravity of a body is the point at which it’s weight can be considered to act.
What three types of equilibrium are there?
- Stable - returns when slightly displaced
- Unstable - Doesn’t return if slightly displaced
- Neutral - Remains in displaced poistion when displaced slightly
What equation links moments, force and perpendicular distance from pivot?
Moment = Force x Perpendicular distance from pivot
What is a couple?
- Fs + Fs = 2Fs
- Magnitude of each force x separation of their lines of action
- Called torque in engineering