Basics Of Physics Flashcards
What SI Units?
Fundamental Units (Base) Of physical quantities
What is the SI unit of mass?
Kg (kilogram)
What physical quantitiy is measured in mol?
Amunt of substance
What is the SI unit of current?
A (amperes)
What is the SI unit for Temperature?
K (Kelvin)
What is the SI unit for length?
m (meters)
What quantity is measured in seconds?
Time
Are Newtons (N) an SI unit?
No Newtons are not fundemental the SI Units for Newtons is Kgms-² (Because force = mass x acceleration)
Derrive the SI units for acceleration?
Kinetic energy = ½ x mass x velocity^2
Units = Kg x m/s x m/s
Kg m^2 s^-2
Derrive The SI unit of force?
Force = mass x acceleration
Units = kg x m/s^-2
kg ms^-2
Express 60TΩ in standard form
6 x 10^13
Write 0.000003m with a suitable prefix
3µm
What is the actual value of 8MΩ?
8,000,000Ω
What is 6000pF in nF?
6nF as 1 nano is a 1000 pico
What multiplier is asociated with the prefix kilo?
x1000 (10^3)
What multiplier is asociated with the prefix femto?
10^-15
Express 75GΩ in standard form
7 x 10^9 Ω
What is 1 eV in J?
1eV is 1.6 x 10^-19J
Express 6kWh in J?
6kW = 6000 J/s 1 hour = 3600s
6kWh = 6000 x 3600
= 21.6 x 10^6 J
= 21.6MJ
Convert 6.6 pJ to eV
6.6pJ = 6.6 x 10^-12 J
divide by 1.6 x 10^-19
6.6 pJ = 4.1 x 10^7 eV
= 41MeV
What is meant by a scalar quantity?
A quantity that only has a magnitude
What is a vector quantity?
A quantity that has a direction aswell as a magnitude
Is acceleration vector or scalar?
Vector
Is mass vector or scalar?
Scalar
what equation is used to calculate density?
Density = mass / volume
What is a moment?
A turning force
force x perpendicular distance from the of the line of action of the force
If an object is in equilibrium the sum of its anticlockwise movements would be
Equal to the some of the clockwis =e movement (principle of movements)
If an object is in equilibrium it means the object is
Not accelerating.It is either:
Stationary
moving at a constant velocity
How can the forces on a object be shown to be in equilibrium?
Adding the horizontal and vertical components of the forces acting on it and showing they equal zero
or if there are three forces acting on an object you can draw a scale diagram - if the scale diagram forms a closed triangle ,then the object is in equilibrium.
What is meant by a couple?
A pair of equal and opposite coplanar forces that have equal magnitude and opposite direction applied to a body parallel to eachother but not along the same line.
What is meant by centre of gravity?
The point through which all weight of an object acts.For a uniform object the centre of gravity is the geometric centre of the object.
