Pupil sheet · Mass, weight and density
Mass, weight and density — final check
Name ______________________ Date ____________
Work alone, with the lesson closed. Answer every question; there are no hints.
1. define / calculate / state / explain
A rover has a mass of 180 kg. On Mars its weight is 670 N. (a) Define gravitational field strength. (b) Calculate the gravitational field strength on Mars, to 2 significant figures. (c) State the rover’s mass on Mars. (d) The rover’s weight on Earth is 1760 N. Explain, using the idea of a gravitational field, why it is different on Mars. (e) How could you check, on Mars, that a sample has the same mass as a 1 kg standard mass? (f) A tool slips from the rover’s arm. Mars has almost no air. What is the tool’s acceleration as it falls?
(a) Definition
(b) g on Mars, with working
(c) Mass on Mars
(d) Why the weight is different
(e) How to compare the masses
(f) Acceleration of the falling tool
2. describe / calculate
A pupil has a cube of metal with sides of 2.0 cm and mass 63 g, a pebble, and a bottle of salt water. (a) Describe how she can find the volume of the cube, then calculate the density of the metal. (b) Describe how she can find the density of the pebble, saying what she measures and how she calculates it. (c) She finds that 50 cm³ of the salt water has a mass of 51.5 g. Calculate its density. (d) Give one way her calculated density of the pebble could come out too big. (e) Describe how she found the mass of the 50 cm³ of salt water.
(a) Volume of the cube and density of the metal
(b) Method for the pebble
(c) Density of the salt water
(d) One way the density could come out too big
(e) Mass of the salt water
3. calculate / predict / explain
The table gives densities: wax 0.90 g/cm³, water 1.00 g/cm³, paraffin oil 0.80 g/cm³. Paraffin oil does not mix with water. (a) A candle of mass 72 g has a volume of 80 cm³. Calculate its density and state whether it floats in water. (b) Will the candle float in paraffin oil? Explain. (c) Paraffin oil is poured onto water. Which liquid is on top, and why? (d) Explain why “big things float and small things sink” is wrong, using densities.
(a) Density of the candle; in water
(b) In paraffin oil
(c) Paraffin oil on water
(d) Why size does not decide