Posted by: tenakha on: June 29, 2009
There is one totally important formula when it comes to forces, F = ma That’s all there is, but everything revolves around that formula. “F” is the total (net) force, “m” is the object’s mass, and “a” is the acceleration that occurs. As a sentence, “The net force applied to the object equals the mass [...]
Posted by: tenakha on: June 19, 2009
Red cells (erythrocytes). These make blood a red colour. One drop of blood contains about five million red cells. Red cells contain a chemical called haemoglobin. This binds to oxygen, and takes oxygen from the lungs to all parts of the body.
Posted by: tenakha on: June 18, 2009
I can’t draw this very well – can you? Please try – all three of you.
Posted by: tenakha on: June 10, 2009
A simple example: 3x + y = 10 equation 1 2x + y = 7 equation 2 STEP 1 – We subtract equation 2 from equation 1 (so we eliminate the y’s) a) 3x -2x = x, b) y-y=0, c) 10-7 = 3 and we are left with: x = 3 STEP 2 – we [...]
Posted by: tenakha on: June 5, 2009
The element Hydrogen is the simplest and most abundant element in the universe. The most common form consists of only one proton and one electron. The atomic mass of Hydrogen is 1.
Posted by: tenakha on: June 5, 2009
Momentum Momentum = mass x velocity the equation is: P = mv Remember the units of mass and velocity: Units of mass: Kg Units of velocity: m/s Thus the units of momentum are: Kg m / s Newtons cradle is a good example of the principle of “conservation of momentum”:
Posted by: tenakha on: June 5, 2009
Weight and Mass What’s the difference between weight and mass? As long as you stay on Earth, the difference is more philosophical than practical. Uh…what do you mean by that? Well, mass is a measurement of how much matter is in an object; weight is a measurement of how hard gravity is pulling on that [...]
