1 Flashcards
volume
length x length x length
=m^3
density
mass/volume
= kg/m^3 or kgm^-3
velocity
displacement/time
= m/s or ms^-1
acceleration
velocity/time
=m/s^2 or ms^-2
force
mass x acceleration
=kgms^-2 or N
displacement
velocity/time
=m
moment
force x distance
momentum
mass x velocity
=kgm/^s
pressure
force/area
=Pa or N/m^2
tera
10^12
pico
10^-12
mega
10^6
giga
10^9
kilo
10^3
deci
10^-1
centi
10^-2
micro
10^-6
nano
10^-9
milli
10^-3
What is a vernier caliper?
it consists of a main scale and a sliding vernier scale
what is a micrometer screw gauge?
it is used to measure anything less than 1 cm and is too small for the vernier calipers to measure
what is terminal velocity?
it is the greatest speed that a falling object can reach
what are scalar quantities?
Quantities that are measured with numbers and units.e.g length,temp,time.
what are vector quantities?
quantities that are measured with numbers and units but also have a specific direction.
name 5 vector quantities?
displacement,velocity,acceleration,force,weight,friction,momentum,moment.
name 5 scalar quantities?
mass,length,distance,speed,power,energy and work
what does the area under a velocity time graph represent?
the distance covered
what is mass?
Mass is the amount of matter that makes up an
object.
how can the mass of an object change?
The mass of an object will not change unless we add
or subtract matter from it.
what is used in measuring mass?
use a triple beam balance and
a digital top-balance to
measure mass.
how do u calculate weight?
weight (N) = mass (kg) x gravitational field strength (N/kg)
what are features of mass?
Always remains constant
Does not depend on gravity
Measured in Kg
Measured with a Top-Balance
what are features of weight?
Depends on gravity
weight=mass x gravity
weight of an object changes if the gravity changes
Measured in N
Measured with a spring balance
what does inertia depend on?
depends on the mass of
the body:
The bigger the mass the more the
Inertia
The smaller the mass the less the
inertia.
what is inertia?
the natural tendency of an object to resist change in its state.
or
The inbuilt reluctance of a body to want to remain at rest or to continue in uniform motion is called the INERTIA.
