Matter and forces

1. MATTER, MASS AND VOLUME Matter: everything with mass and volume. Mass: amount of matter in a body. We measure it in grames and kilogrames. Volume: it´s the amount of space that something occupies. Measure: litres. Density: it expains why some objects float on water and why others  sink. We calculate it by dividing the mass of an object by its volume .       D=       mass                volume Example: Cork: 0,25 Kg/l Water: 1,00 Kg/l Iron:  7.90 Kg/l        Which one will float? and sink? Why? Game about matter, mass and volume:  http://www.e-learningforkids.org/science/lesson/iceland-mass-volume-matter/ EXPERIMENT I: Float the egg EXPERIMENT II:  relationship among matter, mass and volume. 2. Changes in matter: PHYSICAL AND CHEMICAL CHANGES Physical changes: matter has 3 forms: solid, liquid and gas. A physical change...