Micro meter screw guage
Measuring cylinder
Temperature
Mass
Stopwatch
Gravity
The stone would move downwards
what do they mean by fixed points
1. upper fixed point (100 oC )
2. Lower fixed point (O oC)
Narrow bore
Glass stem
Scale
Bulb (contain Hg)
Combined gas law
The amount of heat energy need to raise the temperature of 1 kg of
substance by 1 degree Celsius
P= pressure V= volume
Temperature change
Q= mc (deltaT)
or
Phase change
Q= ml
Note: 1 degree celsius = 1 kelvin
n= # of moles
R= ideal gas constant T= Temp
The enery required to move water from 33 oC to 100 oC is =
The energy required to change water to steam (water vapour) =
2,251,200 J + 18, 400,000 J =
20,651,200 J
When two objects collide in an isolated system, momentum before = momentum after
Momentum before collision= momentum after collision
m x v (truck) - m x v (car) = momentum aft
31,250 kgms-1 - 18,750 kgms-1 = (1250 kg x 625 kg )x v
12500 kgms-1 = 1875 kg x v
V = 12500 kgms-1 / 1875 kg = 6.7 ms-1 due N
Example - Lauching of a space rocket
The fuel in the rocket burns and this pushes the exhuast of the gases downwards,
which in turn pushes the rocket upwards
In terms of two cars colliding ( Providing no external forces are present)
the momementum before the cars collide will equal to the momentum after collison of
the cars.
Gravitational Force
A ball floating in water
Friction
Magnetic force
A moving ball coming to a stop
Two magentics attracting or repelling
each other
Clockwise moments = Anti clockwise moments