Mass, Weight, and Density Practice Questions #

1. An astronaut has a mass of 70 kg on Earth.

   1. Calculate her weight on Earth (g = 9.81 N/kg)
   2. Calculate her weight on the Moon (g = 1.62 N/kg)
   3. What happens to her mass on the Moon? Explain your answer.

2. A rectangular block has dimensions 5cm × 4cm × 3cm and a mass of 120g.

   1. Calculate its volume in cm³
   2. Calculate its density in g/cm³
   3. Calculate its weight in Newtons on Earth (g = 9.81 N/kg)

3. The table below shows the weight of an object measured on different planets:

   Planet	Weight (N)	Gravitational Field Strength (N/kg)
   Earth	100	9.81
   Mars	37.2	3.72

   1. Calculate the mass of the object
   2. Explain why the weight is different but the mass stays the same

4. A student measures the mass of an irregular stone as 35g. When placed in a measuring cylinder, the water level rises from 25cm³ to 40cm³.

   1. Calculate the volume of the stone
   2. Calculate its density in g/cm³
   3. Will the stone float or sink in water (density = 1 g/cm³)? Explain your answer.

5. A cube has a density of 2.7 g/cm³ and a volume of 8 cm³. Calculate:

   1. The mass of the cube in grams
   2. The weight of the cube in Newtons
   3. The length of one side of the cube in cm

6. Sarah conducts an experiment to measure both mass and density of a metal sample. She records these measurements:

   • Mass readings: 24.2g, 24.0g, 24.1g
   • Volume readings: 3.0cm³, 3.1cm³, 3.0cm³

   Calculate:

   1. The average mass
   2. The average volume
   3. The density using these average values