Started exploring mass, weight, volume and density. Students learned the formula for finding density. They will be having a quiz on these subjects on Wednesday. The quiz will be fill-in-the-blank. This is a good study guide:
Mass is a measure of the amount of matter in an object. This differs from weight because weight takes gravity into account. This means that your weight will change depending on the gravity of where you are but your mass will remain constant. We measure mass with a balance.We can also measure volume. Volume is a measure of space taken up by matter. Volume can be measured with a formula (length x width x height) or in a graduated cylinder. You can also use water to indirectly measure volume. This is done by adding the object into water and calculating the displacement of the water.These calculations can help us find the density of an object. Density is the mass of a known volume of a substance. Specifically, the formula for density is mass divided by volume. The density of water is 1 g/cm3. An object that is more dense will sink in water. An object that is less dense will float in water.
7th Grade
We started exploring force. Force is a push or pull on an object. It is measured in Newtons with a Spring scale. Spring scales show the measurements in pounds or Newtons. We use Newtons in science since the measurement of weight depends on the gravity and Newtons remain more constant. Students were given Spring scales and taught how to use them properly.
Students are to have a completed Venn diagram of mass and weight with them by tomorrow. They had a few minutes to work on it in class but if it is not complete, it is homework. You can find some great information here, here, and here.
