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weight A reel of copper wire is labelled length 30 m and diameter 2 mm . A student calculates the volume of the copper wire. Which instruments does he use to measure accurately the leng th and the diameter of the wire? Which row correctly shows examples of a vector quantity and a scalar quantity?
Physical Science Mass and Weight. Use the following formula to solve for weight: Weight (W) = Mass (m) x gravity (g) W = mg. Mass is measured in kilograms (kg) Gravity on earth is a constant: 9.8 m/s2 Weight is measured in Newton’s (1 N = 1 kg m/s2) Answer the following questions – show ALL WORK and UNITS. 1. Define Mass –.
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- You have a rock with a volume of 15cm3 and a mass of 45 g. What is its density? Show Problem 1 solution. Hide. Density is mass divided by volume, so that the density is 45 g divided by 15cm3, which is 3.0 g/cm3.
- You have a different rock with a volume of 30cm3 and a mass of 60g. What is its density? Show Problem 2 solution. Hide. Density is mass divided by volume, so that the density is 60 g divided by 30cm3, which is 2.0 g/cm3.
- In the above two examples which rock is heavier? Which is lighter? Show Problem 3 solution. Hide. The question is asking about heavier and lighter, which refers to mass or weight.
- In the above two examples which rock is more dense? which is less dense? Show Problem 4 solution. Hide. The question is asking about density, and that is the ratio of mass to volume.
The weight of a cylinder on the Moon is less than its wei ght on the Earth. How do the gravitational field strength and the mass of the cylinder on the Moon compare with their values on the Earth?
Interact with blocks of different materials, including a custom option by modifying their mass and volume, to explore the effect on the density and discover the conditions for sinking or floating in water. Play detective to determine the material of each block by comparing its density with the values in the table.
Key learning points. Density is calculated using the equation: density = mass ÷ volume. Density is measured in kg/m³ or g/cm³. The volume of water displaced by a submerged object is equal to the volume of the object. The dimensions of a regular cuboid can be measured accurately with Vernier callipers.
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Weight is a force and it is the pull of gravity acting on an object. It is measured in Newtons. Experiment Collect a 20N spring balance and a set of 100 g masses. Predict the weight (force of gravity) on 100 g. Record this in the table. Test your answer and record the measured weight.
